[PATCH v2 00/15] drm/i915: Baytrail MIPI DSI support

[PATCH v2 00/15] drm/i915: Baytrail MIPI DSI support

[Jani Nikula]

Hi all, v2 of 
http://mid.gmane.org/cover.1376397804.git.jani.nikula@intel.com

Patch 10/15 is new, fixing PLL assertions for DSI PLL.

BR,
Jani.


Jani Nikula (10):
  drm/i915: add more VLV IOSF sideband ports accessors
  drm/i915: add VLV pipeconf bit definition for DSI PLL lock
  drm/i915: add MIPI DSI register definitions
  drm/i915: add MIPI DSI output type and subtypes
  drm/i915: add structs for MIPI DSI output
  drm/i915: add MIPI DSI command sending routines
  drm/i915: add basic MIPI DSI output support
  drm/i915: fix PLL assertions for DSI PLL
  drm/i915: don't enable DPLL for DSI
  drm/i915: initialize DSI output on VLV

Shobhit Kumar (4):
  drm: add MIPI DSI encoder and connector types
  drm/i915: Band Gap WA
  drm/i915: Parse the MIPI related VBT Block and store relevant info
  drm/i915: add AUO MIPI DSI display sub-encoder

ymohanma (1):
  drm/i915: add VLV DSI PLL Calculations

 drivers/gpu/drm/drm_crtc.c             |    2 +
 drivers/gpu/drm/i915/Makefile          |    4 +
 drivers/gpu/drm/i915/auo_dsi_display.c |  182 ++++++++++
 drivers/gpu/drm/i915/i915_drv.h        |   13 +
 drivers/gpu/drm/i915/i915_reg.h        |  425 +++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_bios.c      |   16 +
 drivers/gpu/drm/i915/intel_bios.h      |   41 +++
 drivers/gpu/drm/i915/intel_display.c   |   94 +++--
 drivers/gpu/drm/i915/intel_drv.h       |    7 +-
 drivers/gpu/drm/i915/intel_dsi.c       |  594 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dsi.h       |  105 ++++++
 drivers/gpu/drm/i915/intel_dsi_cmd.c   |  442 ++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dsi_cmd.h   |  109 ++++++
 drivers/gpu/drm/i915/intel_dsi_pll.c   |  310 +++++++++++++++++
 drivers/gpu/drm/i915/intel_sideband.c  |   56 +++
 include/uapi/drm/drm_mode.h            |    2 +
 16 files changed, 2374 insertions(+), 28 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/auo_dsi_display.c
 create mode 100644 drivers/gpu/drm/i915/intel_dsi.c
 create mode 100644 drivers/gpu/drm/i915/intel_dsi.h
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.c
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.h
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_pll.c

-- 
1.7.9.5

[PATCH v2 01/15] drm: add MIPI DSI encoder and connector types

[Jani Nikula]

From: Shobhit Kumar <shobhit.kumar@intel.com>

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_crtc.c  |    2 ++
 include/uapi/drm/drm_mode.h |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index fc83bb9..8768c5f 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -209,6 +209,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] =
 	{ DRM_MODE_CONNECTOR_TV, "TV", 0 },
 	{ DRM_MODE_CONNECTOR_eDP, "eDP", 0 },
 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual", 0},
+	{ DRM_MODE_CONNECTOR_DSI, "DSI", 0},
 };
 
 static const struct drm_prop_enum_list drm_encoder_enum_list[] =
@@ -218,6 +219,7 @@ static const struct drm_prop_enum_list drm_encoder_enum_list[] =
 	{ DRM_MODE_ENCODER_LVDS, "LVDS" },
 	{ DRM_MODE_ENCODER_TVDAC, "TV" },
 	{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
+	{ DRM_MODE_ENCODER_DSI, "DSI" },
 };
 
 const char *drm_get_encoder_name(const struct drm_encoder *encoder)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 53db7ce..589114e 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -165,6 +165,7 @@ struct drm_mode_get_plane_res {
 #define DRM_MODE_ENCODER_LVDS	3
 #define DRM_MODE_ENCODER_TVDAC	4
 #define DRM_MODE_ENCODER_VIRTUAL 5
+#define DRM_MODE_ENCODER_DSI	6
 
 struct drm_mode_get_encoder {
 	__u32 encoder_id;
@@ -203,6 +204,7 @@ struct drm_mode_get_encoder {
 #define DRM_MODE_CONNECTOR_TV		13
 #define DRM_MODE_CONNECTOR_eDP		14
 #define DRM_MODE_CONNECTOR_VIRTUAL      15
+#define DRM_MODE_CONNECTOR_DSI		16
 
 struct drm_mode_get_connector {
 
-- 
1.7.9.5

[PATCH v2 02/15] drm/i915: add more VLV IOSF sideband ports accessors

[Jani Nikula]

For GPIO NC, CCK, CCU, and GPS CORE.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |    8 +++++
 drivers/gpu/drm/i915/i915_reg.h       |    4 +++
 drivers/gpu/drm/i915/intel_sideband.c |   56 +++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1eb4d98..96c875b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2171,6 +2171,14 @@ int sandybridge_pcode_write(struct drm_i915_private *dev_priv, u8 mbox, u32 val)
 u32 vlv_punit_read(struct drm_i915_private *dev_priv, u8 addr);
 void vlv_punit_write(struct drm_i915_private *dev_priv, u8 addr, u32 val);
 u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr);
+u32 vlv_gpio_nc_read(struct drm_i915_private *dev_priv, u32 reg);
+void vlv_gpio_nc_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg);
+void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg);
+void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
+u32 vlv_gps_core_read(struct drm_i915_private *dev_priv, u32 reg);
+void vlv_gps_core_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
 u32 vlv_dpio_read(struct drm_i915_private *dev_priv, int reg);
 void vlv_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val);
 u32 intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a543c4e..b417a8c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -360,6 +360,10 @@
 #define   IOSF_PORT_PUNIT			0x4
 #define   IOSF_PORT_NC				0x11
 #define   IOSF_PORT_DPIO			0x12
+#define   IOSF_PORT_GPIO_NC			0x13
+#define   IOSF_PORT_CCK				0x14
+#define   IOSF_PORT_CCU				0xA9
+#define   IOSF_PORT_GPS_CORE			0x48
 #define VLV_IOSF_DATA				(VLV_DISPLAY_BASE + 0x2104)
 #define VLV_IOSF_ADDR				(VLV_DISPLAY_BASE + 0x2108)
 
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index 9a0e6c5..0a41670 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -101,6 +101,62 @@ u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr)
 	return val;
 }
 
+u32 vlv_gpio_nc_read(struct drm_i915_private *dev_priv, u32 reg)
+{
+	u32 val = 0;
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_GPIO_NC,
+			PUNIT_OPCODE_REG_READ, reg, &val);
+	return val;
+}
+
+void vlv_gpio_nc_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
+{
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_GPIO_NC,
+			PUNIT_OPCODE_REG_WRITE, reg, &val);
+}
+
+u32 vlv_cck_read(struct drm_i915_private *dev_priv, u32 reg)
+{
+	u32 val = 0;
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_CCK,
+			PUNIT_OPCODE_REG_READ, reg, &val);
+	return val;
+}
+
+void vlv_cck_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
+{
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_CCK,
+			PUNIT_OPCODE_REG_WRITE, reg, &val);
+}
+
+u32 vlv_ccu_read(struct drm_i915_private *dev_priv, u32 reg)
+{
+	u32 val = 0;
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_CCU,
+			PUNIT_OPCODE_REG_READ, reg, &val);
+	return val;
+}
+
+void vlv_ccu_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
+{
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_CCU,
+			PUNIT_OPCODE_REG_WRITE, reg, &val);
+}
+
+u32 vlv_gps_core_read(struct drm_i915_private *dev_priv, u32 reg)
+{
+	u32 val = 0;
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_GPS_CORE,
+			PUNIT_OPCODE_REG_READ, reg, &val);
+	return val;
+}
+
+void vlv_gps_core_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
+{
+	vlv_sideband_rw(dev_priv, PCI_DEVFN(2, 0), IOSF_PORT_GPS_CORE,
+			PUNIT_OPCODE_REG_WRITE, reg, &val);
+}
+
 u32 vlv_dpio_read(struct drm_i915_private *dev_priv, int reg)
 {
 	u32 val = 0;
-- 
1.7.9.5

[PATCH v2 03/15] drm/i915: add VLV pipeconf bit definition for DSI PLL lock

[Jani Nikula]

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b417a8c..2f8e341 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2972,6 +2972,7 @@
 #define   PIPECONF_DISABLE	0
 #define   PIPECONF_DOUBLE_WIDE	(1<<30)
 #define   I965_PIPECONF_ACTIVE	(1<<30)
+#define   PIPECONF_DSI_PLL_LOCKED	(1<<29) /* vlv only */
 #define   PIPECONF_FRAME_START_DELAY_MASK (3<<27)
 #define   PIPECONF_SINGLE_WIDE	0
 #define   PIPECONF_PIPE_UNLOCKED 0
-- 
1.7.9.5

[PATCH v2 04/15] drm/i915: add MIPI DSI register definitions

[Jani Nikula]

Add definitions for VLV MIPI DSI registers.

v2: Small fixes per Ville's review comments.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h |  410 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 410 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2f8e341..9879619 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5104,4 +5104,414 @@
 #define PIPE_CSC_POSTOFF_ME(pipe) _PIPE(pipe, _PIPE_A_CSC_POSTOFF_ME, _PIPE_B_CSC_POSTOFF_ME)
 #define PIPE_CSC_POSTOFF_LO(pipe) _PIPE(pipe, _PIPE_A_CSC_POSTOFF_LO, _PIPE_B_CSC_POSTOFF_LO)
 
+/* VLV MIPI registers */
+
+#define _MIPIA_PORT_CTRL			(VLV_DISPLAY_BASE + 0x61190)
+#define _MIPIB_PORT_CTRL			(VLV_DISPLAY_BASE + 0x61700)
+#define MIPI_PORT_CTRL(pipe)		_PIPE(pipe, _MIPIA_PORT_CTRL, _MIPIB_PORT_CTRL)
+#define  DPI_ENABLE					(1 << 31) /* A + B */
+#define  MIPIA_MIPI4DPHY_DELAY_COUNT_SHIFT		27
+#define  MIPIA_MIPI4DPHY_DELAY_COUNT_MASK		(0xf << 27)
+#define  DUAL_LINK_MODE_MASK				(1 << 26)
+#define  DUAL_LINK_MODE_FRONT_BACK			(0 << 26)
+#define  DUAL_LINK_MODE_PIXEL_ALTERNATIVE		(1 << 26)
+#define  DITHERING_ENABLE				(1 << 25) /* A + B */
+#define  FLOPPED_HSTX					(1 << 23)
+#define  DE_INVERT					(1 << 19) /* XXX */
+#define  MIPIA_FLISDSI_DELAY_COUNT_SHIFT		18
+#define  MIPIA_FLISDSI_DELAY_COUNT_MASK			(0xf << 18)
+#define  AFE_LATCHOUT					(1 << 17)
+#define  LP_OUTPUT_HOLD					(1 << 16)
+#define  MIPIB_FLISDSI_DELAY_COUNT_HIGH_SHIFT		15
+#define  MIPIB_FLISDSI_DELAY_COUNT_HIGH_MASK		(1 << 15)
+#define  MIPIB_MIPI4DPHY_DELAY_COUNT_SHIFT		11
+#define  MIPIB_MIPI4DPHY_DELAY_COUNT_MASK		(0xf << 11)
+#define  CSB_SHIFT					9
+#define  CSB_MASK					(3 << 9)
+#define  CSB_20MHZ					(0 << 9)
+#define  CSB_10MHZ					(1 << 9)
+#define  CSB_40MHZ					(2 << 9)
+#define  BANDGAP_MASK					(1 << 8)
+#define  BANDGAP_PNW_CIRCUIT				(0 << 8)
+#define  BANDGAP_LNC_CIRCUIT				(1 << 8)
+#define  MIPIB_FLISDSI_DELAY_COUNT_LOW_SHIFT		5
+#define  MIPIB_FLISDSI_DELAY_COUNT_LOW_MASK		(7 << 5)
+#define  TEARING_EFFECT_DELAY				(1 << 4) /* A + B */
+#define  TEARING_EFFECT_SHIFT				2 /* A + B */
+#define  TEARING_EFFECT_MASK				(3 << 2)
+#define  TEARING_EFFECT_OFF				(0 << 2)
+#define  TEARING_EFFECT_DSI				(1 << 2)
+#define  TEARING_EFFECT_GPIO				(2 << 2)
+#define  LANE_CONFIGURATION_SHIFT			0
+#define  LANE_CONFIGURATION_MASK			(3 << 0)
+#define  LANE_CONFIGURATION_4LANE			(0 << 0)
+#define  LANE_CONFIGURATION_DUAL_LINK_A			(1 << 0)
+#define  LANE_CONFIGURATION_DUAL_LINK_B			(2 << 0)
+
+#define _MIPIA_TEARING_CTRL			(VLV_DISPLAY_BASE + 0x61194)
+#define _MIPIB_TEARING_CTRL			(VLV_DISPLAY_BASE + 0x61704)
+#define MIPI_TEARING_CTRL(pipe)		_PIPE(pipe, _MIPIA_TEARING_CTRL, _MIPIB_TEARING_CTRL)
+#define  TEARING_EFFECT_DELAY_SHIFT			0
+#define  TEARING_EFFECT_DELAY_MASK			(0xffff << 0)
+
+/* XXX: all bits reserved */
+#define _MIPIA_AUTOPWG				(VLV_DISPLAY_BASE + 0x611a0)
+
+/* MIPI DSI Controller and D-PHY registers */
+
+#define _MIPIA_DEVICE_READY			(VLV_DISPLAY_BASE + 0xb000)
+#define _MIPIB_DEVICE_READY			(VLV_DISPLAY_BASE + 0xb800)
+#define MIPI_DEVICE_READY(pipe)		_PIPE(pipe, _MIPIA_DEVICE_READY, _MIPIB_DEVICE_READY)
+#define  BUS_POSSESSION					(1 << 3) /* set to give bus to receiver */
+#define  ULPS_STATE_MASK				(3 << 1)
+#define  ULPS_STATE_ENTER				(2 << 1)
+#define  ULPS_STATE_EXIT				(1 << 1)
+#define  ULPS_STATE_NORMAL_OPERATION			(0 << 1)
+#define  DEVICE_READY					(1 << 0)
+
+#define _MIPIA_INTR_STAT			(VLV_DISPLAY_BASE + 0xb004)
+#define _MIPIB_INTR_STAT			(VLV_DISPLAY_BASE + 0xb804)
+#define MIPI_INTR_STAT(pipe)		_PIPE(pipe, _MIPIA_INTR_STAT, _MIPIB_INTR_STAT)
+#define _MIPIA_INTR_EN				(VLV_DISPLAY_BASE + 0xb008)
+#define _MIPIB_INTR_EN				(VLV_DISPLAY_BASE + 0xb808)
+#define MIPI_INTR_EN(pipe)		_PIPE(pipe, _MIPIA_INTR_EN, _MIPIB_INTR_EN)
+#define  TEARING_EFFECT					(1 << 31)
+#define  SPL_PKT_SENT_INTERRUPT				(1 << 30)
+#define  GEN_READ_DATA_AVAIL				(1 << 29)
+#define  LP_GENERIC_WR_FIFO_FULL			(1 << 28)
+#define  HS_GENERIC_WR_FIFO_FULL			(1 << 27)
+#define  RX_PROT_VIOLATION				(1 << 26)
+#define  RX_INVALID_TX_LENGTH				(1 << 25)
+#define  ACK_WITH_NO_ERROR				(1 << 24)
+#define  TURN_AROUND_ACK_TIMEOUT			(1 << 23)
+#define  LP_RX_TIMEOUT					(1 << 22)
+#define  HS_TX_TIMEOUT					(1 << 21)
+#define  DPI_FIFO_UNDERRUN				(1 << 20)
+#define  LOW_CONTENTION					(1 << 19)
+#define  HIGH_CONTENTION				(1 << 18)
+#define  TXDSI_VC_ID_INVALID				(1 << 17)
+#define  TXDSI_DATA_TYPE_NOT_RECOGNISED			(1 << 16)
+#define  TXCHECKSUM_ERROR				(1 << 15)
+#define  TXECC_MULTIBIT_ERROR				(1 << 14)
+#define  TXECC_SINGLE_BIT_ERROR				(1 << 13)
+#define  TXFALSE_CONTROL_ERROR				(1 << 12)
+#define  RXDSI_VC_ID_INVALID				(1 << 11)
+#define  RXDSI_DATA_TYPE_NOT_REGOGNISED			(1 << 10)
+#define  RXCHECKSUM_ERROR				(1 << 9)
+#define  RXECC_MULTIBIT_ERROR				(1 << 8)
+#define  RXECC_SINGLE_BIT_ERROR				(1 << 7)
+#define  RXFALSE_CONTROL_ERROR				(1 << 6)
+#define  RXHS_RECEIVE_TIMEOUT_ERROR			(1 << 5)
+#define  RX_LP_TX_SYNC_ERROR				(1 << 4)
+#define  RXEXCAPE_MODE_ENTRY_ERROR			(1 << 3)
+#define  RXEOT_SYNC_ERROR				(1 << 2)
+#define  RXSOT_SYNC_ERROR				(1 << 1)
+#define  RXSOT_ERROR					(1 << 0)
+
+#define _MIPIA_DSI_FUNC_PRG			(VLV_DISPLAY_BASE + 0xb00c)
+#define _MIPIB_DSI_FUNC_PRG			(VLV_DISPLAY_BASE + 0xb80c)
+#define MIPI_DSI_FUNC_PRG(pipe)		_PIPE(pipe, _MIPIA_DSI_FUNC_PRG, _MIPIB_DSI_FUNC_PRG)
+#define  CMD_MODE_DATA_WIDTH_MASK			(7 << 13)
+#define  CMD_MODE_NOT_SUPPORTED				(0 << 13)
+#define  CMD_MODE_DATA_WIDTH_16_BIT			(1 << 13)
+#define  CMD_MODE_DATA_WIDTH_9_BIT			(2 << 13)
+#define  CMD_MODE_DATA_WIDTH_8_BIT			(3 << 13)
+#define  CMD_MODE_DATA_WIDTH_OPTION1			(4 << 13)
+#define  CMD_MODE_DATA_WIDTH_OPTION2			(5 << 13)
+#define  VID_MODE_FORMAT_MASK				(0xf << 7)
+#define  VID_MODE_NOT_SUPPORTED				(0 << 7)
+#define  VID_MODE_FORMAT_RGB565				(1 << 7)
+#define  VID_MODE_FORMAT_RGB666				(2 << 7)
+#define  VID_MODE_FORMAT_RGB666_LOOSE			(3 << 7)
+#define  VID_MODE_FORMAT_RGB888				(4 << 7)
+#define  CMD_MODE_CHANNEL_NUMBER_SHIFT			5
+#define  CMD_MODE_CHANNEL_NUMBER_MASK			(3 << 5)
+#define  VID_MODE_CHANNEL_NUMBER_SHIFT			3
+#define  VID_MODE_CHANNEL_NUMBER_MASK			(3 << 3)
+#define  DATA_LANES_PRG_REG_SHIFT			0
+#define  DATA_LANES_PRG_REG_MASK			(7 << 0)
+
+#define _MIPIA_HS_TX_TIMEOUT			(VLV_DISPLAY_BASE + 0xb010)
+#define _MIPIB_HS_TX_TIMEOUT			(VLV_DISPLAY_BASE + 0xb810)
+#define MIPI_HS_TX_TIMEOUT(pipe)	_PIPE(pipe, _MIPIA_HS_TX_TIMEOUT, _MIPIB_HS_TX_TIMEOUT)
+#define  HIGH_SPEED_TX_TIMEOUT_COUNTER_MASK		0xffffff
+
+#define _MIPIA_LP_RX_TIMEOUT			(VLV_DISPLAY_BASE + 0xb014)
+#define _MIPIB_LP_RX_TIMEOUT			(VLV_DISPLAY_BASE + 0xb814)
+#define MIPI_LP_RX_TIMEOUT(pipe)	_PIPE(pipe, _MIPIA_LP_RX_TIMEOUT, _MIPIB_LP_RX_TIMEOUT)
+#define  LOW_POWER_RX_TIMEOUT_COUNTER_MASK		0xffffff
+
+#define _MIPIA_TURN_AROUND_TIMEOUT		(VLV_DISPLAY_BASE + 0xb018)
+#define _MIPIB_TURN_AROUND_TIMEOUT		(VLV_DISPLAY_BASE + 0xb818)
+#define MIPI_TURN_AROUND_TIMEOUT(pipe)	_PIPE(pipe, _MIPIA_TURN_AROUND_TIMEOUT, _MIPIB_TURN_AROUND_TIMEOUT)
+#define  TURN_AROUND_TIMEOUT_MASK			0x3f
+
+#define _MIPIA_DEVICE_RESET_TIMER		(VLV_DISPLAY_BASE + 0xb01c)
+#define _MIPIB_DEVICE_RESET_TIMER		(VLV_DISPLAY_BASE + 0xb81c)
+#define MIPI_DEVICE_RESET_TIMER(pipe)	_PIPE(pipe, _MIPIA_DEVICE_RESET_TIMER, _MIPIB_DEVICE_RESET_TIMER)
+#define  DEVICE_RESET_TIMER_MASK			0xffff
+
+#define _MIPIA_DPI_RESOLUTION			(VLV_DISPLAY_BASE + 0xb020)
+#define _MIPIB_DPI_RESOLUTION			(VLV_DISPLAY_BASE + 0xb820)
+#define MIPI_DPI_RESOLUTION(pipe)	_PIPE(pipe, _MIPIA_DPI_RESOLUTION, _MIPIB_DPI_RESOLUTION)
+#define  VERTICAL_ADDRESS_SHIFT				16
+#define  VERTICAL_ADDRESS_MASK				(0xffff << 16)
+#define  HORIZONTAL_ADDRESS_SHIFT			0
+#define  HORIZONTAL_ADDRESS_MASK			0xffff
+
+#define _MIPIA_DBI_FIFO_THROTTLE		(VLV_DISPLAY_BASE + 0xb024)
+#define _MIPIB_DBI_FIFO_THROTTLE		(VLV_DISPLAY_BASE + 0xb824)
+#define MIPI_DBI_FIFO_THROTTLE(pipe)	_PIPE(pipe, _MIPIA_DBI_FIFO_THROTTLE, _MIPIB_DBI_FIFO_THROTTLE)
+#define  DBI_FIFO_EMPTY_HALF				(0 << 0)
+#define  DBI_FIFO_EMPTY_QUARTER				(1 << 0)
+#define  DBI_FIFO_EMPTY_7_LOCATIONS			(2 << 0)
+
+/* regs below are bits 15:0 */
+#define _MIPIA_HSYNC_PADDING_COUNT		(VLV_DISPLAY_BASE + 0xb028)
+#define _MIPIB_HSYNC_PADDING_COUNT		(VLV_DISPLAY_BASE + 0xb828)
+#define MIPI_HSYNC_PADDING_COUNT(pipe)	_PIPE(pipe, _MIPIA_HSYNC_PADDING_COUNT, _MIPIB_HSYNC_PADDING_COUNT)
+
+#define _MIPIA_HBP_COUNT			(VLV_DISPLAY_BASE + 0xb02c)
+#define _MIPIB_HBP_COUNT			(VLV_DISPLAY_BASE + 0xb82c)
+#define MIPI_HBP_COUNT(pipe)		_PIPE(pipe, _MIPIA_HBP_COUNT, _MIPIB_HBP_COUNT)
+
+#define _MIPIA_HFP_COUNT			(VLV_DISPLAY_BASE + 0xb030)
+#define _MIPIB_HFP_COUNT			(VLV_DISPLAY_BASE + 0xb830)
+#define MIPI_HFP_COUNT(pipe)		_PIPE(pipe, _MIPIA_HFP_COUNT, _MIPIB_HFP_COUNT)
+
+#define _MIPIA_HACTIVE_AREA_COUNT		(VLV_DISPLAY_BASE + 0xb034)
+#define _MIPIB_HACTIVE_AREA_COUNT		(VLV_DISPLAY_BASE + 0xb834)
+#define MIPI_HACTIVE_AREA_COUNT(pipe)	_PIPE(pipe, _MIPIA_HACTIVE_AREA_COUNT, _MIPIB_HACTIVE_AREA_COUNT)
+
+#define _MIPIA_VSYNC_PADDING_COUNT		(VLV_DISPLAY_BASE + 0xb038)
+#define _MIPIB_VSYNC_PADDING_COUNT		(VLV_DISPLAY_BASE + 0xb838)
+#define MIPI_VSYNC_PADDING_COUNT(pipe)	_PIPE(pipe, _MIPIA_VSYNC_PADDING_COUNT, _MIPIB_VSYNC_PADDING_COUNT)
+
+#define _MIPIA_VBP_COUNT			(VLV_DISPLAY_BASE + 0xb03c)
+#define _MIPIB_VBP_COUNT			(VLV_DISPLAY_BASE + 0xb83c)
+#define MIPI_VBP_COUNT(pipe)		_PIPE(pipe, _MIPIA_VBP_COUNT, _MIPIB_VBP_COUNT)
+
+#define _MIPIA_VFP_COUNT			(VLV_DISPLAY_BASE + 0xb040)
+#define _MIPIB_VFP_COUNT			(VLV_DISPLAY_BASE + 0xb840)
+#define MIPI_VFP_COUNT(pipe)		_PIPE(pipe, _MIPIA_VFP_COUNT, _MIPIB_VFP_COUNT)
+
+#define _MIPIA_HIGH_LOW_SWITCH_COUNT		(VLV_DISPLAY_BASE + 0xb044)
+#define _MIPIB_HIGH_LOW_SWITCH_COUNT		(VLV_DISPLAY_BASE + 0xb844)
+#define MIPI_HIGH_LOW_SWITCH_COUNT(pipe)	_PIPE(pipe, _MIPIA_HIGH_LOW_SWITCH_COUNT, _MIPIB_HIGH_LOW_SWITCH_COUNT)
+/* regs above are bits 15:0 */
+
+#define _MIPIA_DPI_CONTROL			(VLV_DISPLAY_BASE + 0xb048)
+#define _MIPIB_DPI_CONTROL			(VLV_DISPLAY_BASE + 0xb848)
+#define MIPI_DPI_CONTROL(pipe)		_PIPE(pipe, _MIPIA_DPI_CONTROL, _MIPIB_DPI_CONTROL)
+#define  DPI_LP_MODE					(1 << 6)
+#define  BACKLIGHT_OFF					(1 << 5)
+#define  BACKLIGHT_ON					(1 << 4)
+#define  COLOR_MODE_OFF					(1 << 3)
+#define  COLOR_MODE_ON					(1 << 2)
+#define  TURN_ON					(1 << 1)
+#define  SHUTDOWN					(1 << 0)
+
+#define _MIPIA_DPI_DATA				(VLV_DISPLAY_BASE + 0xb04c)
+#define _MIPIB_DPI_DATA				(VLV_DISPLAY_BASE + 0xb84c)
+#define MIPI_DPI_DATA(pipe)		_PIPE(pipe, _MIPIA_DPI_DATA, _MIPIB_DPI_DATA)
+#define  COMMAND_BYTE_SHIFT				0
+#define  COMMAND_BYTE_MASK				(0x3f << 0)
+
+#define _MIPIA_INIT_COUNT			(VLV_DISPLAY_BASE + 0xb050)
+#define _MIPIB_INIT_COUNT			(VLV_DISPLAY_BASE + 0xb850)
+#define MIPI_INIT_COUNT(pipe)		_PIPE(pipe, _MIPIA_INIT_COUNT, _MIPIB_INIT_COUNT)
+#define  MASTER_INIT_TIMER_SHIFT			0
+#define  MASTER_INIT_TIMER_MASK				(0xffff << 0)
+
+#define _MIPIA_MAX_RETURN_PKT_SIZE		(VLV_DISPLAY_BASE + 0xb054)
+#define _MIPIB_MAX_RETURN_PKT_SIZE		(VLV_DISPLAY_BASE + 0xb854)
+#define MIPI_MAX_RETURN_PKT_SIZE(pipe)	_PIPE(pipe, _MIPIA_MAX_RETURN_PKT_SIZE, _MIPIB_MAX_RETURN_PKT_SIZE)
+#define  MAX_RETURN_PKT_SIZE_SHIFT			0
+#define  MAX_RETURN_PKT_SIZE_MASK			(0x3ff << 0)
+
+#define _MIPIA_VIDEO_MODE_FORMAT		(VLV_DISPLAY_BASE + 0xb058)
+#define _MIPIB_VIDEO_MODE_FORMAT		(VLV_DISPLAY_BASE + 0xb858)
+#define MIPI_VIDEO_MODE_FORMAT(pipe)	_PIPE(pipe, _MIPIA_VIDEO_MODE_FORMAT, _MIPIB_VIDEO_MODE_FORMAT)
+#define  RANDOM_DPI_DISPLAY_RESOLUTION			(1 << 4)
+#define  DISABLE_VIDEO_BTA				(1 << 3)
+#define  IP_TG_CONFIG					(1 << 2)
+#define  VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE		(1 << 0)
+#define  VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS		(2 << 0)
+#define  VIDEO_MODE_BURST				(3 << 0)
+
+#define _MIPIA_EOT_DISABLE			(VLV_DISPLAY_BASE + 0xb05c)
+#define _MIPIB_EOT_DISABLE			(VLV_DISPLAY_BASE + 0xb85c)
+#define MIPI_EOT_DISABLE(pipe)		_PIPE(pipe, _MIPIA_EOT_DISABLE, _MIPIB_EOT_DISABLE)
+#define  LP_RX_TIMEOUT_ERROR_RECOVERY_DISABLE		(1 << 7)
+#define  HS_RX_TIMEOUT_ERROR_RECOVERY_DISABLE		(1 << 6)
+#define  LOW_CONTENTION_RECOVERY_DISABLE		(1 << 5)
+#define  HIGH_CONTENTION_RECOVERY_DISABLE		(1 << 4)
+#define  TXDSI_TYPE_NOT_RECOGNISED_ERROR_RECOVERY_DISABLE (1 << 3)
+#define  TXECC_MULTIBIT_ERROR_RECOVERY_DISABLE		(1 << 2)
+#define  CLOCKSTOP					(1 << 1)
+#define  EOT_DISABLE					(1 << 0)
+
+#define _MIPIA_LP_BYTECLK			(VLV_DISPLAY_BASE + 0xb060)
+#define _MIPIB_LP_BYTECLK			(VLV_DISPLAY_BASE + 0xb860)
+#define MIPI_LP_BYTECLK(pipe)		_PIPE(pipe, _MIPIA_LP_BYTECLK, _MIPIB_LP_BYTECLK)
+#define  LP_BYTECLK_SHIFT				0
+#define  LP_BYTECLK_MASK				(0xffff << 0)
+
+/* bits 31:0 */
+#define _MIPIA_LP_GEN_DATA			(VLV_DISPLAY_BASE + 0xb064)
+#define _MIPIB_LP_GEN_DATA			(VLV_DISPLAY_BASE + 0xb864)
+#define MIPI_LP_GEN_DATA(pipe)		_PIPE(pipe, _MIPIA_LP_GEN_DATA, _MIPIB_LP_GEN_DATA)
+
+/* bits 31:0 */
+#define _MIPIA_HS_GEN_DATA			(VLV_DISPLAY_BASE + 0xb068)
+#define _MIPIB_HS_GEN_DATA			(VLV_DISPLAY_BASE + 0xb868)
+#define MIPI_HS_GEN_DATA(pipe)		_PIPE(pipe, _MIPIA_HS_GEN_DATA, _MIPIB_HS_GEN_DATA)
+
+#define _MIPIA_LP_GEN_CTRL			(VLV_DISPLAY_BASE + 0xb06c)
+#define _MIPIB_LP_GEN_CTRL			(VLV_DISPLAY_BASE + 0xb86c)
+#define MIPI_LP_GEN_CTRL(pipe)		_PIPE(pipe, _MIPIA_LP_GEN_CTRL, _MIPIB_LP_GEN_CTRL)
+#define _MIPIA_HS_GEN_CTRL			(VLV_DISPLAY_BASE + 0xb070)
+#define _MIPIB_HS_GEN_CTRL			(VLV_DISPLAY_BASE + 0xb870)
+#define MIPI_HS_GEN_CTRL(pipe)		_PIPE(pipe, _MIPIA_HS_GEN_CTRL, _MIPIB_HS_GEN_CTRL)
+#define  LONG_PACKET_WORD_COUNT_SHIFT			8
+#define  LONG_PACKET_WORD_COUNT_MASK			(0xffff << 8)
+#define  SHORT_PACKET_PARAM_SHIFT			8
+#define  SHORT_PACKET_PARAM_MASK			(0xffff << 8)
+#define  VIRTUAL_CHANNEL_SHIFT				6
+#define  VIRTUAL_CHANNEL_MASK				(3 << 6)
+#define  DATA_TYPE_SHIFT				0
+#define  DATA_TYPE_MASK					(3f << 0)
+/* data type values, see include/video/mipi_display.h */
+
+#define _MIPIA_GEN_FIFO_STAT			(VLV_DISPLAY_BASE + 0xb074)
+#define _MIPIB_GEN_FIFO_STAT			(VLV_DISPLAY_BASE + 0xb874)
+#define MIPI_GEN_FIFO_STAT(pipe)	_PIPE(pipe, _MIPIA_GEN_FIFO_STAT, _MIPIB_GEN_FIFO_STAT)
+#define  DPI_FIFO_EMPTY					(1 << 28)
+#define  DBI_FIFO_EMPTY					(1 << 27)
+#define  LP_CTRL_FIFO_EMPTY				(1 << 26)
+#define  LP_CTRL_FIFO_HALF_EMPTY			(1 << 25)
+#define  LP_CTRL_FIFO_FULL				(1 << 24)
+#define  HS_CTRL_FIFO_EMPTY				(1 << 18)
+#define  HS_CTRL_FIFO_HALF_EMPTY			(1 << 17)
+#define  HS_CTRL_FIFO_FULL				(1 << 16)
+#define  LP_DATA_FIFO_EMPTY				(1 << 10)
+#define  LP_DATA_FIFO_HALF_EMPTY			(1 << 9)
+#define  LP_DATA_FIFO_FULL				(1 << 8)
+#define  HS_DATA_FIFO_EMPTY				(1 << 2)
+#define  HS_DATA_FIFO_HALF_EMPTY			(1 << 1)
+#define  HS_DATA_FIFO_FULL				(1 << 0)
+
+#define _MIPIA_HS_LS_DBI_ENABLE			(VLV_DISPLAY_BASE + 0xb078)
+#define _MIPIB_HS_LS_DBI_ENABLE			(VLV_DISPLAY_BASE + 0xb878)
+#define MIPI_HS_LP_DBI_ENABLE(pipe)	_PIPE(pipe, _MIPIA_HS_LS_DBI_ENABLE, _MIPIB_HS_LS_DBI_ENABLE)
+#define  DBI_HS_LP_MODE_MASK				(1 << 0)
+#define  DBI_LP_MODE					(1 << 0)
+#define  DBI_HS_MODE					(0 << 0)
+
+#define _MIPIA_DPHY_PARAM			(VLV_DISPLAY_BASE + 0xb080)
+#define _MIPIB_DPHY_PARAM			(VLV_DISPLAY_BASE + 0xb880)
+#define MIPI_DPHY_PARAM(pipe)		_PIPE(pipe, _MIPIA_DPHY_PARAM, _MIPIB_DPHY_PARAM)
+#define  EXIT_ZERO_COUNT_SHIFT				24
+#define  EXIT_ZERO_COUNT_MASK				(0x3f << 24)
+#define  TRAIL_COUNT_SHIFT				16
+#define  TRAIL_COUNT_MASK				(0x1f << 16)
+#define  CLK_ZERO_COUNT_SHIFT				8
+#define  CLK_ZERO_COUNT_MASK				(0xff << 8)
+#define  PREPARE_COUNT_SHIFT				0
+#define  PREPARE_COUNT_MASK				(0x3f << 0)
+
+/* bits 31:0 */
+#define _MIPIA_DBI_BW_CTRL			(VLV_DISPLAY_BASE + 0xb084)
+#define _MIPIB_DBI_BW_CTRL			(VLV_DISPLAY_BASE + 0xb884)
+#define MIPI_DBI_BW_CTRL(pipe)		_PIPE(pipe, _MIPIA_DBI_BW_CTRL, _MIPIB_DBI_BW_CTRL)
+
+#define _MIPIA_CLK_LANE_SWITCH_TIME_CNT		(VLV_DISPLAY_BASE + 0xb088)
+#define _MIPIB_CLK_LANE_SWITCH_TIME_CNT		(VLV_DISPLAY_BASE + 0xb888)
+#define MIPI_CLK_LANE_SWITCH_TIME_CNT(pipe)	_PIPE(pipe, _MIPIA_CLK_LANE_SWITCH_TIME_CNT, _MIPIB_CLK_LANE_SWITCH_TIME_CNT)
+#define  LP_HS_SSW_CNT_SHIFT				16
+#define  LP_HS_SSW_CNT_MASK				(0xffff << 16)
+#define  HS_LP_PWR_SW_CNT_SHIFT				0
+#define  HS_LP_PWR_SW_CNT_MASK				(0xffff << 0)
+
+#define _MIPIA_STOP_STATE_STALL			(VLV_DISPLAY_BASE + 0xb08c)
+#define _MIPIB_STOP_STATE_STALL			(VLV_DISPLAY_BASE + 0xb88c)
+#define MIPI_STOP_STATE_STALL(pipe)	_PIPE(pipe, _MIPIA_STOP_STATE_STALL, _MIPIB_STOP_STATE_STALL)
+#define  STOP_STATE_STALL_COUNTER_SHIFT			0
+#define  STOP_STATE_STALL_COUNTER_MASK			(0xff << 0)
+
+#define _MIPIA_INTR_STAT_REG_1			(VLV_DISPLAY_BASE + 0xb090)
+#define _MIPIB_INTR_STAT_REG_1			(VLV_DISPLAY_BASE + 0xb890)
+#define MIPI_INTR_STAT_REG_1(pipe)	_PIPE(pipe, _MIPIA_INTR_STAT_REG_1, _MIPIB_INTR_STAT_REG_1)
+#define _MIPIA_INTR_EN_REG_1			(VLV_DISPLAY_BASE + 0xb094)
+#define _MIPIB_INTR_EN_REG_1			(VLV_DISPLAY_BASE + 0xb894)
+#define MIPI_INTR_EN_REG_1(pipe)	_PIPE(pipe, _MIPIA_INTR_EN_REG_1, _MIPIB_INTR_EN_REG_1)
+#define  RX_CONTENTION_DETECTED				(1 << 0)
+
+/* XXX: only pipe A ?!? */
+#define MIPIA_DBI_TYPEC_CTRL			(VLV_DISPLAY_BASE + 0xb100)
+#define  DBI_TYPEC_ENABLE				(1 << 31)
+#define  DBI_TYPEC_WIP					(1 << 30)
+#define  DBI_TYPEC_OPTION_SHIFT				28
+#define  DBI_TYPEC_OPTION_MASK				(3 << 28)
+#define  DBI_TYPEC_FREQ_SHIFT				24
+#define  DBI_TYPEC_FREQ_MASK				(0xf << 24)
+#define  DBI_TYPEC_OVERRIDE				(1 << 8)
+#define  DBI_TYPEC_OVERRIDE_COUNTER_SHIFT		0
+#define  DBI_TYPEC_OVERRIDE_COUNTER_MASK		(0xff << 0)
+
+
+/* MIPI adapter registers */
+
+#define _MIPIA_CTRL				(VLV_DISPLAY_BASE + 0xb104)
+#define _MIPIB_CTRL				(VLV_DISPLAY_BASE + 0xb904)
+#define MIPI_CTRL(pipe)			_PIPE(pipe, _MIPIA_CTRL, _MIPIB_CTRL)
+#define  ESCAPE_CLOCK_DIVIDER_SHIFT			5 /* A only */
+#define  ESCAPE_CLOCK_DIVIDER_MASK			(3 << 5)
+#define  ESCAPE_CLOCK_DIVIDER_1				(0 << 5)
+#define  ESCAPE_CLOCK_DIVIDER_2				(1 << 5)
+#define  ESCAPE_CLOCK_DIVIDER_4				(2 << 5)
+#define  READ_REQUEST_PRIORITY_SHIFT			3
+#define  READ_REQUEST_PRIORITY_MASK			(3 << 3)
+#define  READ_REQUEST_PRIORITY_LOW			(0 << 3)
+#define  READ_REQUEST_PRIORITY_HIGH			(3 << 3)
+#define  RGB_FLIP_TO_BGR				(1 << 2)
+
+#define _MIPIA_DATA_ADDRESS			(VLV_DISPLAY_BASE + 0xb108)
+#define _MIPIB_DATA_ADDRESS			(VLV_DISPLAY_BASE + 0xb908)
+#define MIPI_DATA_ADDRESS(pipe)		_PIPE(pipe, _MIPIA_DATA_ADDRESS, _MIPIB_DATA_ADDRESS)
+#define  DATA_MEM_ADDRESS_SHIFT				5
+#define  DATA_MEM_ADDRESS_MASK				(0x7ffffff << 5)
+#define  DATA_VALID					(1 << 0)
+
+#define _MIPIA_DATA_LENGTH			(VLV_DISPLAY_BASE + 0xb10c)
+#define _MIPIB_DATA_LENGTH			(VLV_DISPLAY_BASE + 0xb90c)
+#define MIPI_DATA_LENGTH(pipe)		_PIPE(pipe, _MIPIA_DATA_LENGTH, _MIPIB_DATA_LENGTH)
+#define  DATA_LENGTH_SHIFT				0
+#define  DATA_LENGTH_MASK				(0xfffff << 0)
+
+#define _MIPIA_COMMAND_ADDRESS			(VLV_DISPLAY_BASE + 0xb110)
+#define _MIPIB_COMMAND_ADDRESS			(VLV_DISPLAY_BASE + 0xb910)
+#define MIPI_COMMAND_ADDRESS(pipe)	_PIPE(pipe, _MIPIA_COMMAND_ADDRESS, _MIPIB_COMMAND_ADDRESS)
+#define  COMMAND_MEM_ADDRESS_SHIFT			5
+#define  COMMAND_MEM_ADDRESS_MASK			(0x7ffffff << 5)
+#define  AUTO_PWG_ENABLE				(1 << 2)
+#define  MEMORY_WRITE_DATA_FROM_PIPE_RENDERING		(1 << 1)
+#define  COMMAND_VALID					(1 << 0)
+
+#define _MIPIA_COMMAND_LENGTH			(VLV_DISPLAY_BASE + 0xb114)
+#define _MIPIB_COMMAND_LENGTH			(VLV_DISPLAY_BASE + 0xb914)
+#define MIPI_COMMAND_LENGTH(pipe)	_PIPE(pipe, _MIPIA_COMMAND_LENGTH, _MIPIB_COMMAND_LENGTH)
+#define  COMMAND_LENGTH_SHIFT(n)			(8 * (n)) /* n: 0...3 */
+#define  COMMAND_LENGTH_MASK(n)				(0xff << (8 * (n)))
+
+#define _MIPIA_READ_DATA_RETURN0		(VLV_DISPLAY_BASE + 0xb118)
+#define _MIPIB_READ_DATA_RETURN0		(VLV_DISPLAY_BASE + 0xb918)
+#define MIPI_READ_DATA_RETURN(pipe, n) \
+	(_PIPE(pipe, _MIPIA_READ_DATA_RETURN0, _MIPIB_READ_DATA_RETURN0) + 4 * (n)) /* n: 0...7 */
+
+#define _MIPIA_READ_DATA_VALID			(VLV_DISPLAY_BASE + 0xb138)
+#define _MIPIB_READ_DATA_VALID			(VLV_DISPLAY_BASE + 0xb938)
+#define MIPI_READ_DATA_VALID(pipe)	_PIPE(pipe, _MIPIA_READ_DATA_VALID, _MIPIB_READ_DATA_VALID)
+#define  READ_DATA_VALID(n)				(1 << (n))
+
 #endif /* _I915_REG_H_ */
-- 
1.7.9.5

[PATCH v2 05/15] drm/i915: add MIPI DSI output type and subtypes

[Jani Nikula]

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 01455aa..a31abc6 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -93,13 +93,17 @@
 #define INTEL_OUTPUT_HDMI 6
 #define INTEL_OUTPUT_DISPLAYPORT 7
 #define INTEL_OUTPUT_EDP 8
-#define INTEL_OUTPUT_UNKNOWN 9
+#define INTEL_OUTPUT_DSI 9
+#define INTEL_OUTPUT_UNKNOWN 10
 
 #define INTEL_DVO_CHIP_NONE 0
 #define INTEL_DVO_CHIP_LVDS 1
 #define INTEL_DVO_CHIP_TMDS 2
 #define INTEL_DVO_CHIP_TVOUT 4
 
+#define INTEL_DSI_COMMAND_MODE	0
+#define INTEL_DSI_VIDEO_MODE	1
+
 struct intel_framebuffer {
 	struct drm_framebuffer base;
 	struct drm_i915_gem_object *obj;
-- 
1.7.9.5

[PATCH v2 06/15] drm/i915: add structs for MIPI DSI output

[Jani Nikula]

The sub-encoder model is copied from DVO.

v2: Add attached_connector to struct intel_dsi.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.h |   99 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/intel_dsi.h

diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
new file mode 100644
index 0000000..f308269
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _INTEL_DSI_H
+#define _INTEL_DSI_H
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include "intel_drv.h"
+
+struct intel_dsi_device {
+	unsigned int panel_id;
+	const char *name;
+	int type;
+	const struct intel_dsi_dev_ops *dev_ops;
+	void *dev_priv;
+};
+
+struct intel_dsi_dev_ops {
+	bool (*init)(struct intel_dsi_device *dsi);
+
+	/* This callback must be able to assume DSI commands can be sent */
+	void (*enable)(struct intel_dsi_device *dsi);
+
+	/* This callback must be able to assume DSI commands can be sent */
+	void (*disable)(struct intel_dsi_device *dsi);
+
+	int (*mode_valid)(struct intel_dsi_device *dsi,
+			  struct drm_display_mode *mode);
+
+	bool (*mode_fixup)(struct intel_dsi_device *dsi,
+			   const struct drm_display_mode *mode,
+			   struct drm_display_mode *adjusted_mode);
+
+	void (*mode_set)(struct intel_dsi_device *dsi,
+			 struct drm_display_mode *mode,
+			 struct drm_display_mode *adjusted_mode);
+
+	enum drm_connector_status (*detect)(struct intel_dsi_device *dsi);
+
+	bool (*get_hw_state)(struct intel_dsi_device *dev);
+
+	struct drm_display_mode *(*get_modes)(struct intel_dsi_device *dsi);
+
+	void (*destroy) (struct intel_dsi_device *dsi);
+};
+
+struct intel_dsi {
+	struct intel_encoder base;
+
+	struct intel_dsi_device dev;
+
+	struct intel_connector *attached_connector;
+
+	/* if true, use HS mode, otherwise LP */
+	bool hs;
+
+	/* virtual channel */
+	int channel;
+
+	/* number of DSI lanes */
+	unsigned int lane_count;
+
+	/* video mode pixel format for MIPI_DSI_FUNC_PRG register */
+	u32 pixel_format;
+
+	/* video mode format for MIPI_VIDEO_MODE_FORMAT register */
+	u32 video_mode_format;
+
+	/* eot for MIPI_EOT_DISABLE register */
+	u32 eot_disable;
+};
+
+static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct intel_dsi, base.base);
+}
+
+#endif /* _INTEL_DSI_H */
-- 
1.7.9.5

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 07/15] drm/i915: add MIPI DSI command sending routines

[Jani Nikula]

v2: Rebase due to register bit definition change.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/Makefile        |    1 +
 drivers/gpu/drm/i915/intel_dsi_cmd.c |  442 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dsi_cmd.h |  109 +++++++++
 3 files changed, 552 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.c
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index b8449a8..8bffd29 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -21,6 +21,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
 	  intel_display.o \
 	  intel_crt.o \
 	  intel_lvds.o \
+	  intel_dsi_cmd.o \
 	  intel_bios.o \
 	  intel_ddi.o \
 	  intel_dp.o \
diff --git a/drivers/gpu/drm/i915/intel_dsi_cmd.c b/drivers/gpu/drm/i915/intel_dsi_cmd.c
new file mode 100644
index 0000000..aca41c9
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi_cmd.c
@@ -0,0 +1,442 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Jani Nikula <jani.nikula@intel.com>
+ */
+
+#include <linux/export.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <video/mipi_display.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include "intel_dsi.h"
+#include "intel_dsi_cmd.h"
+
+/*
+ * XXX: MIPI_DATA_ADDRESS, MIPI_DATA_LENGTH, MIPI_COMMAND_LENGTH, and
+ * MIPI_COMMAND_ADDRESS registers.
+ *
+ * Apparently these registers provide a MIPI adapter level way to send (lots of)
+ * commands and data to the receiver, without having to write the commands and
+ * data to MIPI_{HS,LP}_GEN_{CTRL,DATA} registers word by word.
+ *
+ * Presumably for anything other than MIPI_DCS_WRITE_MEMORY_START and
+ * MIPI_DCS_WRITE_MEMORY_CONTINUE (which are used to update the external
+ * framebuffer in command mode displays) these are just an optimization that can
+ * come later.
+ *
+ * For memory writes, these should probably be used for performance.
+ */
+
+static void print_stat(struct intel_dsi *intel_dsi)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 val;
+
+	val = I915_READ(MIPI_INTR_STAT(pipe));
+
+#define STAT_BIT(val, bit) (val) & (bit) ? " " #bit : ""
+	DRM_DEBUG_KMS("MIPI_INTR_STAT(%d) = %08x"
+		      "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s"
+		      "\n", pipe, val,
+		      STAT_BIT(val, TEARING_EFFECT),
+		      STAT_BIT(val, SPL_PKT_SENT_INTERRUPT),
+		      STAT_BIT(val, GEN_READ_DATA_AVAIL),
+		      STAT_BIT(val, LP_GENERIC_WR_FIFO_FULL),
+		      STAT_BIT(val, HS_GENERIC_WR_FIFO_FULL),
+		      STAT_BIT(val, RX_PROT_VIOLATION),
+		      STAT_BIT(val, RX_INVALID_TX_LENGTH),
+		      STAT_BIT(val, ACK_WITH_NO_ERROR),
+		      STAT_BIT(val, TURN_AROUND_ACK_TIMEOUT),
+		      STAT_BIT(val, LP_RX_TIMEOUT),
+		      STAT_BIT(val, HS_TX_TIMEOUT),
+		      STAT_BIT(val, DPI_FIFO_UNDERRUN),
+		      STAT_BIT(val, LOW_CONTENTION),
+		      STAT_BIT(val, HIGH_CONTENTION),
+		      STAT_BIT(val, TXDSI_VC_ID_INVALID),
+		      STAT_BIT(val, TXDSI_DATA_TYPE_NOT_RECOGNISED),
+		      STAT_BIT(val, TXCHECKSUM_ERROR),
+		      STAT_BIT(val, TXECC_MULTIBIT_ERROR),
+		      STAT_BIT(val, TXECC_SINGLE_BIT_ERROR),
+		      STAT_BIT(val, TXFALSE_CONTROL_ERROR),
+		      STAT_BIT(val, RXDSI_VC_ID_INVALID),
+		      STAT_BIT(val, RXDSI_DATA_TYPE_NOT_REGOGNISED),
+		      STAT_BIT(val, RXCHECKSUM_ERROR),
+		      STAT_BIT(val, RXECC_MULTIBIT_ERROR),
+		      STAT_BIT(val, RXECC_SINGLE_BIT_ERROR),
+		      STAT_BIT(val, RXFALSE_CONTROL_ERROR),
+		      STAT_BIT(val, RXHS_RECEIVE_TIMEOUT_ERROR),
+		      STAT_BIT(val, RX_LP_TX_SYNC_ERROR),
+		      STAT_BIT(val, RXEXCAPE_MODE_ENTRY_ERROR),
+		      STAT_BIT(val, RXEOT_SYNC_ERROR),
+		      STAT_BIT(val, RXSOT_SYNC_ERROR),
+		      STAT_BIT(val, RXSOT_ERROR));
+#undef STAT_BIT
+}
+
+enum dsi_type {
+	DSI_DCS,
+	DSI_GENERIC,
+};
+
+/* enable or disable command mode hs transmissions */
+void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 temp;
+	u32 mask = DBI_FIFO_EMPTY;
+
+	/* XXX: or wait for !full...? */
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50))
+		DRM_ERROR("Timeout waiting for DBI FIFO empty\n");
+
+	temp = I915_READ(MIPI_HS_LP_DBI_ENABLE(pipe));
+	temp &= DBI_HS_LP_MODE_MASK;
+	I915_WRITE(MIPI_HS_LP_DBI_ENABLE(pipe), enable ? DBI_HS_MODE : DBI_LP_MODE);
+
+	intel_dsi->hs = enable;
+}
+
+static int dsi_vc_send_short(struct intel_dsi *intel_dsi, int channel,
+			     u8 data_type, u16 data)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 ctrl_reg;
+	u32 ctrl;
+	u32 mask;
+
+	DRM_DEBUG_KMS("channel %d, data_type %d, data %04x\n",
+		      channel, data_type, data);
+
+	/* XXX: set MIPI_HS_LS_DBI_ENABLE? wait for dbi fifo empty first */
+
+	/* XXX: short write, do we need to wait for data FIFO? */
+	if (intel_dsi->hs) {
+		ctrl_reg = MIPI_HS_GEN_CTRL(pipe);
+		mask = HS_CTRL_FIFO_FULL;
+	} else {
+		ctrl_reg = MIPI_LP_GEN_CTRL(pipe);
+		mask = LP_CTRL_FIFO_FULL;
+	}
+
+	/* Note: Could also wait for !full instead of empty. */
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50)) {
+		DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
+		print_stat(intel_dsi);
+	}
+
+	ctrl = data << SHORT_PACKET_PARAM_SHIFT |
+		channel << VIRTUAL_CHANNEL_SHIFT |
+		data_type << DATA_TYPE_SHIFT;
+
+	I915_WRITE(ctrl_reg, ctrl);
+
+	return 0;
+}
+
+static int dsi_vc_send_long(struct intel_dsi *intel_dsi, int channel,
+			    u8 data_type, const u8 *data, u16 len)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 data_reg, ctrl_reg, ctrl;
+	u16 i, j, n;
+	u32 mask;
+
+	DRM_DEBUG_KMS("channel %d, data_type %d, len %04x\n",
+		      channel, data_type, len);
+
+	/* XXX: set MIPI_HS_LS_DBI_ENABLE? wait for dbi fifo empty first */
+
+	if (intel_dsi->hs) {
+		data_reg = MIPI_HS_GEN_DATA(pipe);
+		ctrl_reg = MIPI_HS_GEN_CTRL(pipe);
+		mask = HS_DATA_FIFO_FULL;
+	} else {
+		data_reg = MIPI_LP_GEN_DATA(pipe);
+		ctrl_reg = MIPI_LP_GEN_CTRL(pipe);
+		mask = LP_DATA_FIFO_FULL;
+	}
+
+	/* Note: Could also wait for !full instead of empty. */
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50))
+		DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
+
+	for (i = 0; i < len; i += n) {
+		u32 val = 0;
+		n = min(len - i, 4);
+
+		for (j = 0; j < n; j++)
+			val |= *data++ << 8 * j;
+
+		I915_WRITE(data_reg, val);
+		/* XXX: check for data fifo full, once that is set, write 4
+		 * dwords, then wait for not set, then continue. */
+	}
+
+	if (intel_dsi->hs)
+		mask = HS_CTRL_FIFO_FULL;
+	else
+		mask = LP_CTRL_FIFO_FULL;
+
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50))
+		DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
+
+	ctrl = len << LONG_PACKET_WORD_COUNT_SHIFT;
+	ctrl |= channel << VIRTUAL_CHANNEL_SHIFT;
+	ctrl |= data_type << DATA_TYPE_SHIFT;
+
+	I915_WRITE(ctrl_reg, ctrl);
+
+	return 0;
+}
+
+static int dsi_vc_write_common(struct intel_dsi *intel_dsi,
+			       int channel, const u8 *data, int len,
+			       enum dsi_type type)
+{
+	int ret;
+
+	if (len == 0) {
+		BUG_ON(type == DSI_GENERIC);
+		ret = dsi_vc_send_short(intel_dsi, channel,
+					MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM,
+					0);
+	} else if (len == 1) {
+		ret = dsi_vc_send_short(intel_dsi, channel,
+					type == DSI_GENERIC ?
+					MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM :
+					MIPI_DSI_DCS_SHORT_WRITE, data[0]);
+	} else if (len == 2) {
+		ret = dsi_vc_send_short(intel_dsi, channel,
+					type == DSI_GENERIC ?
+					MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM :
+					MIPI_DSI_DCS_SHORT_WRITE_PARAM,
+					(data[1] << 8) | data[0]);
+	} else {
+		ret = dsi_vc_send_long(intel_dsi, channel,
+				       type == DSI_GENERIC ?
+				       MIPI_DSI_GENERIC_LONG_WRITE :
+				       MIPI_DSI_DCS_LONG_WRITE, data, len);
+	}
+
+	return ret;
+}
+
+int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel,
+		     const u8 *data, int len)
+{
+	return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_DCS);
+}
+
+int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel,
+			 const u8 *data, int len)
+{
+	return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_GENERIC);
+}
+
+static int dsi_vc_dcs_send_read_request(struct intel_dsi *intel_dsi,
+					int channel, u8 dcs_cmd)
+{
+	return dsi_vc_send_short(intel_dsi, channel, MIPI_DSI_DCS_READ,
+				 dcs_cmd);
+}
+
+static int dsi_vc_generic_send_read_request(struct intel_dsi *intel_dsi,
+					    int channel, u8 *reqdata,
+					    int reqlen)
+{
+	u16 data;
+	u8 data_type;
+
+	switch (reqlen) {
+	case 0:
+		data_type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
+		data = 0;
+		break;
+	case 1:
+		data_type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
+		data = reqdata[0];
+		break;
+	case 2:
+		data_type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
+		data = (reqdata[1] << 8) | reqdata[0];
+		break;
+	default:
+		BUG();
+	}
+
+	return dsi_vc_send_short(intel_dsi, channel, data_type, data);
+}
+
+static int dsi_read_data_return(struct intel_dsi *intel_dsi,
+				u8 *buf, int buflen)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	int i, j, len = 0;
+	u32 data_valid, val;
+
+	data_valid = I915_READ(MIPI_READ_DATA_VALID(pipe));
+
+	/* XXX: byte order of data in return registers? */
+	for (i = 0; i < 8 && len < buflen; i++) {
+		if (!(data_valid & (1 << i)))
+			break;
+
+		val = I915_READ(MIPI_READ_DATA_RETURN(pipe, i));
+		for (j = 0; j < 4 && len < buflen; j++, len++)
+			buf[len] = val >> 8 * j;
+	}
+
+	/* Clear the data valid bits. */
+	I915_WRITE(MIPI_READ_DATA_VALID(pipe), data_valid);
+
+	return len;
+}
+
+int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd,
+		    u8 *buf, int buflen)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 mask;
+	int ret;
+
+	/* XXX: should issue multiple read requests and reads if request is
+	 * longer than MIPI_MAX_RETURN_PKT_SIZE */
+
+	ret = dsi_vc_dcs_send_read_request(intel_dsi, channel, dcs_cmd);
+	if (ret)
+		return ret;
+
+	mask = GEN_READ_DATA_AVAIL;
+	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50))
+		DRM_ERROR("Timeout waiting for read data.\n");
+
+	ret = dsi_read_data_return(intel_dsi, buf, buflen);
+	if (ret < 0)
+		return ret;
+
+	if (ret != buflen)
+		return -EIO;
+
+	return 0;
+}
+
+int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel,
+			u8 *reqdata, int reqlen, u8 *buf, int buflen)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 mask;
+	int ret;
+
+	/* XXX: should issue multiple read requests and reads if request is
+	 * longer than MIPI_MAX_RETURN_PKT_SIZE.
+	 */
+
+	ret = dsi_vc_generic_send_read_request(intel_dsi, channel, reqdata,
+					       reqlen);
+	if (ret)
+		return ret;
+
+	mask = GEN_READ_DATA_AVAIL;
+	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50))
+		DRM_ERROR("Timeout waiting for read data.\n");
+
+	ret = dsi_read_data_return(intel_dsi, buf, buflen);
+	if (ret < 0)
+		return ret;
+
+	if (ret != buflen)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * send a video mode command
+ *
+ * XXX: commands with data in MIPI_DPI_DATA?
+ */
+int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd)
+{
+	struct drm_encoder *encoder = &intel_dsi->base.base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	enum pipe pipe = intel_crtc->pipe;
+	u32 mask;
+
+	/* XXX: pipe, hs */
+	if (intel_dsi->hs)
+		cmd &= ~DPI_LP_MODE;
+	else
+		cmd |= DPI_LP_MODE;
+
+	/* DPI virtual channel?! */
+
+	mask = DPI_FIFO_EMPTY;
+	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50))
+		DRM_ERROR("Timeout waiting for DPI FIFO empty.\n");
+
+	/* clear bit */
+	I915_WRITE(MIPI_INTR_STAT(pipe), SPL_PKT_SENT_INTERRUPT);
+
+	/* XXX: old code skips write if control unchanged */
+	if (cmd == I915_READ(MIPI_DPI_CONTROL(pipe)))
+		DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);
+
+	I915_WRITE(MIPI_DPI_CONTROL(pipe), cmd);
+
+	mask = SPL_PKT_SENT_INTERRUPT;
+	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == 0, 50))
+		DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/intel_dsi_cmd.h b/drivers/gpu/drm/i915/intel_dsi_cmd.h
new file mode 100644
index 0000000..54c8a23
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi_cmd.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Jani Nikula <jani.nikula@intel.com>
+ */
+
+#ifndef _INTEL_DSI_DSI_H
+#define _INTEL_DSI_DSI_H
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <video/mipi_display.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include "intel_dsi.h"
+
+void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable);
+
+int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel,
+		     const u8 *data, int len);
+
+int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel,
+			 const u8 *data, int len);
+
+int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd,
+		    u8 *buf, int buflen);
+
+int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel,
+			u8 *reqdata, int reqlen, u8 *buf, int buflen);
+
+int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd);
+
+/* XXX: questionable write helpers */
+static inline int dsi_vc_dcs_write_0(struct intel_dsi *intel_dsi,
+				     int channel, u8 dcs_cmd)
+{
+	return dsi_vc_dcs_write(intel_dsi, channel, &dcs_cmd, 1);
+}
+
+static inline int dsi_vc_dcs_write_1(struct intel_dsi *intel_dsi,
+				     int channel, u8 dcs_cmd, u8 param)
+{
+	u8 buf[2] = { dcs_cmd, param };
+	return dsi_vc_dcs_write(intel_dsi, channel, buf, 2);
+}
+
+static inline int dsi_vc_generic_write_0(struct intel_dsi *intel_dsi,
+					 int channel)
+{
+	return dsi_vc_generic_write(intel_dsi, channel, NULL, 0);
+}
+
+static inline int dsi_vc_generic_write_1(struct intel_dsi *intel_dsi,
+					 int channel, u8 param)
+{
+	return dsi_vc_generic_write(intel_dsi, channel, &param, 1);
+}
+
+static inline int dsi_vc_generic_write_2(struct intel_dsi *intel_dsi,
+					 int channel, u8 param1, u8 param2)
+{
+	u8 buf[2] = { param1, param2 };
+	return dsi_vc_generic_write(intel_dsi, channel, buf, 2);
+}
+
+/* XXX: questionable read helpers */
+static inline int dsi_vc_generic_read_0(struct intel_dsi *intel_dsi,
+					int channel, u8 *buf, int buflen)
+{
+	return dsi_vc_generic_read(intel_dsi, channel, NULL, 0, buf, buflen);
+}
+
+static inline int dsi_vc_generic_read_1(struct intel_dsi *intel_dsi,
+					int channel, u8 param, u8 *buf,
+					int buflen)
+{
+	return dsi_vc_generic_read(intel_dsi, channel, &param, 1, buf, buflen);
+}
+
+static inline int dsi_vc_generic_read_2(struct intel_dsi *intel_dsi,
+					int channel, u8 param1, u8 param2,
+					u8 *buf, int buflen)
+{
+	u8 req[2] = { param1, param2 };
+
+	return dsi_vc_generic_read(intel_dsi, channel, req, 2, buf, buflen);
+}
+
+
+#endif /* _INTEL_DSI_DSI_H */
-- 
1.7.9.5

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 08/15] drm/i915: add basic MIPI DSI output support

[Jani Nikula]

This does not include any panel specific sub-encoders yet.

v2: Fix fixed mode handling (Daniel)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/gpu/drm/i915/Makefile    |    1 +
 drivers/gpu/drm/i915/intel_drv.h |    1 +
 drivers/gpu/drm/i915/intel_dsi.c |  534 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 536 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/intel_dsi.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 8bffd29..5864c5b 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -21,6 +21,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
 	  intel_display.o \
 	  intel_crt.o \
 	  intel_lvds.o \
+	  intel_dsi.o \
 	  intel_dsi_cmd.o \
 	  intel_bios.o \
 	  intel_ddi.o \
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a31abc6..cbe3df1 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -525,6 +525,7 @@ extern void intel_mark_fb_busy(struct drm_i915_gem_object *obj,
 			       struct intel_ring_buffer *ring);
 extern void intel_mark_idle(struct drm_device *dev);
 extern void intel_lvds_init(struct drm_device *dev);
+extern bool intel_dsi_init(struct drm_device *dev);
 extern bool intel_is_dual_link_lvds(struct drm_device *dev);
 extern void intel_dp_init(struct drm_device *dev, int output_reg,
 			  enum port port);
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
new file mode 100644
index 0000000..d7eddbd
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -0,0 +1,534 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Jani Nikula <jani.nikula@intel.com>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
+#include <drm/i915_drm.h>
+#include <linux/slab.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include "intel_dsi.h"
+#include "intel_dsi_cmd.h"
+
+/* the sub-encoders aka panel drivers */
+static const struct intel_dsi_device intel_dsi_devices[] = {
+};
+
+static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)
+{
+	return container_of(intel_attached_encoder(connector),
+			    struct intel_dsi, base);
+}
+
+static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
+{
+	return intel_dsi->dev.type == INTEL_DSI_VIDEO_MODE;
+}
+
+static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
+{
+	return intel_dsi->dev.type == INTEL_DSI_COMMAND_MODE;
+}
+
+static void intel_dsi_hot_plug(struct intel_encoder *encoder)
+{
+	DRM_DEBUG_KMS("\n");
+}
+
+static bool intel_dsi_compute_config(struct intel_encoder *encoder,
+				     struct intel_crtc_config *config)
+{
+	struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
+						   base);
+	struct intel_connector *intel_connector = intel_dsi->attached_connector;
+	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
+	struct drm_display_mode *adjusted_mode = &config->adjusted_mode;
+	struct drm_display_mode *mode = &config->requested_mode;
+
+	DRM_DEBUG_KMS("\n");
+
+	if (fixed_mode)
+		intel_fixed_panel_mode(fixed_mode, adjusted_mode);
+
+	if (intel_dsi->dev.dev_ops->mode_fixup)
+		return intel_dsi->dev.dev_ops->mode_fixup(&intel_dsi->dev,
+							  mode, adjusted_mode);
+
+	return true;
+}
+
+static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)
+{
+	DRM_DEBUG_KMS("\n");
+}
+
+static void intel_dsi_pre_enable(struct intel_encoder *encoder)
+{
+	DRM_DEBUG_KMS("\n");
+}
+
+static void intel_dsi_enable(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	int pipe = intel_crtc->pipe;
+	u32 temp;
+
+	DRM_DEBUG_KMS("\n");
+
+	temp = I915_READ(MIPI_DEVICE_READY(pipe));
+	temp &= ~ULPS_STATE_MASK;
+	temp &= ~DEVICE_READY; /* XXX: assuming it's already !ready */
+	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | ULPS_STATE_EXIT);
+	msleep(20); /* XXX */
+	I915_WRITE(MIPI_DEVICE_READY(pipe), temp);
+	msleep(20); /* XXX */
+	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | DEVICE_READY);
+
+	if (is_cmd_mode(intel_dsi))
+		I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(pipe), 8 * 4);
+
+	/* Do this here, or let the slave encoder do it in ->dpms? */
+	if (is_vid_mode(intel_dsi)) {
+		dpi_send_cmd(intel_dsi, TURN_ON);
+		msleep(100);
+	}
+
+	/* assert ip_tg_enable signal */
+	temp = I915_READ(MIPI_PORT_CTRL(pipe));
+	I915_WRITE(MIPI_PORT_CTRL(pipe), temp | DPI_ENABLE);
+	POSTING_READ(MIPI_PORT_CTRL(pipe));
+
+	intel_dsi->dev.dev_ops->enable(&intel_dsi->dev);
+}
+
+static void intel_dsi_disable(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	int pipe = intel_crtc->pipe;
+	u32 temp;
+
+	DRM_DEBUG_KMS("\n");
+
+	intel_dsi->dev.dev_ops->disable(&intel_dsi->dev);
+
+	if (is_vid_mode(intel_dsi))
+		dpi_send_cmd(intel_dsi, SHUTDOWN);
+
+	if (is_vid_mode(intel_dsi)) {
+		/* de-assert ip_tg_enable signal */
+		temp = I915_READ(MIPI_PORT_CTRL(pipe));
+		I915_WRITE(MIPI_PORT_CTRL(pipe), temp & ~DPI_ENABLE);
+		POSTING_READ(MIPI_PORT_CTRL(pipe));
+	}
+
+	/* XXX: wait for fifos before ulps entry */
+
+	temp = I915_READ(MIPI_DEVICE_READY(pipe));
+	temp &= ~ULPS_STATE_MASK;
+	temp &= ~DEVICE_READY;
+	I915_WRITE(MIPI_DEVICE_READY(pipe), temp);
+	msleep(5);
+	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | ULPS_STATE_ENTER);
+}
+
+static void intel_dsi_post_disable(struct intel_encoder *encoder)
+{
+	DRM_DEBUG_KMS("\n");
+}
+
+static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
+				   enum pipe *pipe)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+
+	DRM_DEBUG_KMS("\n");
+
+	/* XXX: this is wrong */
+	if (intel_crtc) {
+		u32 val;
+
+		*pipe = intel_crtc->pipe;
+
+		/* XXX: only works for video mode */
+		val = I915_READ(MIPI_PORT_CTRL(*pipe));
+		return val & DPI_ENABLE;
+	}
+
+	/* XXX: do we also need to call
+	 * intel_dsi->dev.dev_ops->get_hw_state(&intel_dsi->dev);
+	 */
+
+	return false;
+}
+
+static void intel_dsi_get_config(struct intel_encoder *encoder,
+				 struct intel_crtc_config *pipe_config)
+{
+	DRM_DEBUG_KMS("\n");
+
+	/* XXX: read flags, set to adjusted_mode */
+}
+
+static int intel_dsi_mode_valid(struct drm_connector *connector,
+				struct drm_display_mode *mode)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
+	struct intel_dsi *intel_dsi = intel_attached_dsi(connector);
+
+	DRM_DEBUG_KMS("\n");
+
+	if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
+		DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
+		return MODE_NO_DBLESCAN;
+	}
+
+	if (fixed_mode) {
+		if (mode->hdisplay > fixed_mode->hdisplay)
+			return MODE_PANEL;
+		if (mode->vdisplay > fixed_mode->vdisplay)
+			return MODE_PANEL;
+	}
+
+	return intel_dsi->dev.dev_ops->mode_valid(&intel_dsi->dev, mode);
+}
+
+/* return pixels in terms of txbyteclkhs */
+static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count)
+{
+	return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp, 8), lane_count);
+}
+
+static void set_dsi_timings(struct drm_encoder *encoder,
+			    const struct drm_display_mode *mode)
+{
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+	int pipe = intel_crtc->pipe;
+	unsigned int bpp = intel_crtc->config.pipe_bpp;
+	unsigned int lane_count = intel_dsi->lane_count;
+
+	u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
+
+	hactive = mode->hdisplay;
+	hfp = mode->hsync_start - mode->hdisplay;
+	hsync = mode->hsync_end - mode->hsync_start;
+	hbp = mode->htotal - mode->hsync_end;
+
+	vfp = mode->vsync_start - mode->vdisplay;
+	vsync = mode->vsync_end - mode->vsync_start;
+	vbp = mode->vtotal - mode->vsync_end;
+
+	/* horizontal values are in terms of high speed byte clock */
+	hactive = txbyteclkhs(hactive, bpp, lane_count);
+	hfp = txbyteclkhs(hfp, bpp, lane_count);
+	hsync = txbyteclkhs(hsync, bpp, lane_count);
+	hbp = txbyteclkhs(hbp, bpp, lane_count);
+
+	I915_WRITE(MIPI_HACTIVE_AREA_COUNT(pipe), hactive);
+	I915_WRITE(MIPI_HFP_COUNT(pipe), hfp);
+
+	/* meaningful for video mode non-burst sync pulse mode only, can be zero
+	 * for non-burst sync events and burst modes */
+	I915_WRITE(MIPI_HSYNC_PADDING_COUNT(pipe), hsync);
+	I915_WRITE(MIPI_HBP_COUNT(pipe), hbp);
+
+	/* vertical values are in terms of lines */
+	I915_WRITE(MIPI_VFP_COUNT(pipe), vfp);
+	I915_WRITE(MIPI_VSYNC_PADDING_COUNT(pipe), vsync);
+	I915_WRITE(MIPI_VBP_COUNT(pipe), vbp);
+}
+
+static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
+{
+	struct drm_encoder *encoder = &intel_encoder->base;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+	struct drm_display_mode *adjusted_mode =
+		&intel_crtc->config.adjusted_mode;
+	int pipe = intel_crtc->pipe;
+	unsigned int bpp = intel_crtc->config.pipe_bpp;
+	u32 val, tmp;
+
+	DRM_DEBUG_KMS("pipe %d\n", pipe);
+
+	/* escape clock divider, 20MHz, shared for A and C. device ready must be
+	 * off when doing this! txclkesc? */
+	tmp = I915_READ(MIPI_CTRL(0));
+	tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
+	I915_WRITE(MIPI_CTRL(0), tmp | ESCAPE_CLOCK_DIVIDER_1);
+
+	/* read request priority is per pipe */
+	tmp = I915_READ(MIPI_CTRL(pipe));
+	tmp &= ~READ_REQUEST_PRIORITY_MASK;
+	I915_WRITE(MIPI_CTRL(pipe), tmp | READ_REQUEST_PRIORITY_HIGH);
+
+	/* XXX: why here, why like this? handling in irq handler?! */
+	I915_WRITE(MIPI_INTR_STAT(pipe), 0xffffffff);
+	I915_WRITE(MIPI_INTR_EN(pipe), 0xffffffff);
+
+	I915_WRITE(MIPI_DPHY_PARAM(pipe),
+		   0x3c << EXIT_ZERO_COUNT_SHIFT |
+		   0x1f << TRAIL_COUNT_SHIFT |
+		   0xc5 << CLK_ZERO_COUNT_SHIFT |
+		   0x1f << PREPARE_COUNT_SHIFT);
+
+	I915_WRITE(MIPI_DPI_RESOLUTION(pipe),
+		   adjusted_mode->vdisplay << VERTICAL_ADDRESS_SHIFT |
+		   adjusted_mode->hdisplay << HORIZONTAL_ADDRESS_SHIFT);
+
+	set_dsi_timings(encoder, adjusted_mode);
+
+	val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
+	if (is_cmd_mode(intel_dsi)) {
+		val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
+		val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
+	} else {
+		val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
+
+		/* XXX: cross-check bpp vs. pixel format? */
+		val |= intel_dsi->pixel_format;
+	}
+	I915_WRITE(MIPI_DSI_FUNC_PRG(pipe), val);
+
+	/* timeouts for recovery. one frame IIUC. if counter expires, EOT and
+	 * stop state. */
+
+	if (is_vid_mode(intel_dsi) &&
+	    intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
+		I915_WRITE(MIPI_HS_TX_TIMEOUT(pipe),
+			   txbyteclkhs(adjusted_mode->htotal + 1, bpp,
+				       intel_dsi->lane_count));
+	} else {
+		I915_WRITE(MIPI_HS_TX_TIMEOUT(pipe),
+			   txbyteclkhs(adjusted_mode->vtotal *
+				       adjusted_mode->htotal,
+				       bpp, intel_dsi->lane_count));
+	}
+	I915_WRITE(MIPI_LP_RX_TIMEOUT(pipe), 0xffff);
+	I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(pipe), 0x14);
+
+	I915_WRITE(MIPI_DEVICE_RESET_TIMER(pipe), 0xffff);
+
+	/* dphy stuff */
+
+	/* in terms of low power clock */
+	I915_WRITE(MIPI_INIT_COUNT(pipe), 0x7d0);
+
+	/* recovery disables */
+	I915_WRITE(MIPI_EOT_DISABLE(pipe), intel_dsi->eot_disable);
+
+	/* in terms of txbyteclkhs. actual high to low switch +
+	 * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
+	 *
+	 * XXX: write MIPI_STOP_STATE_STALL?
+	 */
+	I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(pipe), 0x46);
+
+	/* XXX: low power clock equivalence in terms of byte clock. the number
+	 * of byte clocks occupied in one low power clock. based on txbyteclkhs
+	 * and txclkesc. txclkesc time / txbyteclk time * (105 +
+	 * MIPI_STOP_STATE_STALL) / 105.???
+	 */
+	I915_WRITE(MIPI_LP_BYTECLK(pipe), 4);
+
+	/* the bw essential for transmitting 16 long packets containing 252
+	 * bytes meant for dcs write memory command is programmed in this
+	 * register in terms of byte clocks. based on dsi transfer rate and the
+	 * number of lanes configured the time taken to transmit 16 long packets
+	 * in a dsi stream varies. */
+	I915_WRITE(MIPI_DBI_BW_CTRL(pipe), 0x820);
+
+	I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(pipe),
+		   0xa << LP_HS_SSW_CNT_SHIFT |
+		   0x14 << HS_LP_PWR_SW_CNT_SHIFT);
+
+	if (is_vid_mode(intel_dsi))
+		I915_WRITE(MIPI_VIDEO_MODE_FORMAT(pipe),
+			   intel_dsi->video_mode_format);
+}
+
+static enum drm_connector_status
+intel_dsi_detect(struct drm_connector *connector, bool force)
+{
+	struct intel_dsi *intel_dsi = intel_attached_dsi(connector);
+	DRM_DEBUG_KMS("\n");
+	return intel_dsi->dev.dev_ops->detect(&intel_dsi->dev);
+}
+
+static int intel_dsi_get_modes(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+	struct drm_display_mode *mode;
+
+	DRM_DEBUG_KMS("\n");
+
+	if (!intel_connector->panel.fixed_mode) {
+		DRM_DEBUG_KMS("no fixed mode\n");
+		return 0;
+	}
+
+	mode = drm_mode_duplicate(connector->dev,
+				  intel_connector->panel.fixed_mode);
+	if (!mode) {
+		DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
+		return 0;
+	}
+
+	drm_mode_probed_add(connector, mode);
+	return 1;
+}
+
+static void intel_dsi_destroy(struct drm_connector *connector)
+{
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+
+	DRM_DEBUG_KMS("\n");
+	intel_panel_fini(&intel_connector->panel);
+	drm_sysfs_connector_remove(connector);
+	drm_connector_cleanup(connector);
+	kfree(connector);
+}
+
+static const struct drm_encoder_funcs intel_dsi_funcs = {
+	.destroy = intel_encoder_destroy,
+};
+
+static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
+	.get_modes = intel_dsi_get_modes,
+	.mode_valid = intel_dsi_mode_valid,
+	.best_encoder = intel_best_encoder,
+};
+
+static const struct drm_connector_funcs intel_dsi_connector_funcs = {
+	.dpms = intel_connector_dpms,
+	.detect = intel_dsi_detect,
+	.destroy = intel_dsi_destroy,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+};
+
+bool intel_dsi_init(struct drm_device *dev)
+{
+	struct intel_dsi *intel_dsi;
+	struct intel_encoder *intel_encoder;
+	struct drm_encoder *encoder;
+	struct intel_connector *intel_connector;
+	struct drm_connector *connector;
+	struct drm_display_mode *fixed_mode = NULL;
+	const struct intel_dsi_device *dsi;
+	unsigned int i;
+
+	DRM_DEBUG_KMS("\n");
+
+	intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
+	if (!intel_dsi)
+		return false;
+
+	intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
+	if (!intel_connector) {
+		kfree(intel_dsi);
+		return false;
+	}
+
+	intel_encoder = &intel_dsi->base;
+	encoder = &intel_encoder->base;
+	intel_dsi->attached_connector = intel_connector;
+
+	connector = &intel_connector->base;
+
+	drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI);
+
+	/* XXX: very likely not all of these are needed */
+	intel_encoder->hot_plug = intel_dsi_hot_plug;
+	intel_encoder->compute_config = intel_dsi_compute_config;
+	intel_encoder->pre_pll_enable = intel_dsi_pre_pll_enable;
+	intel_encoder->pre_enable = intel_dsi_pre_enable;
+	intel_encoder->enable = intel_dsi_enable;
+	intel_encoder->mode_set = intel_dsi_mode_set;
+	intel_encoder->disable = intel_dsi_disable;
+	intel_encoder->post_disable = intel_dsi_post_disable;
+	intel_encoder->get_hw_state = intel_dsi_get_hw_state;
+	intel_encoder->get_config = intel_dsi_get_config;
+
+	intel_connector->get_hw_state = intel_connector_get_hw_state;
+
+	for (i = 0; i < ARRAY_SIZE(intel_dsi_devices); i++) {
+		dsi = &intel_dsi_devices[i];
+		intel_dsi->dev = *dsi;
+
+		if (dsi->dev_ops->init(&intel_dsi->dev))
+			break;
+	}
+
+	if (i == ARRAY_SIZE(intel_dsi_devices)) {
+		DRM_DEBUG_KMS("no device found\n");
+		goto err;
+	}
+
+	intel_encoder->type = INTEL_OUTPUT_DSI;
+	intel_encoder->crtc_mask = (1 << 0); /* XXX */
+
+	intel_encoder->cloneable = false;
+	drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
+			   DRM_MODE_CONNECTOR_DSI);
+
+	drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
+
+	connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
+	connector->interlace_allowed = false;
+	connector->doublescan_allowed = false;
+
+	intel_connector_attach_encoder(intel_connector, intel_encoder);
+
+	drm_sysfs_connector_add(connector);
+
+	fixed_mode = dsi->dev_ops->get_modes(&intel_dsi->dev);
+	if (!fixed_mode) {
+		DRM_DEBUG_KMS("no fixed mode\n");
+		goto err;
+	}
+
+	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
+	intel_panel_init(&intel_connector->panel, fixed_mode);
+
+	return true;
+
+err:
+	drm_encoder_cleanup(&intel_encoder->base);
+	kfree(intel_dsi);
+	kfree(intel_connector);
+
+	return false;
+}
-- 
1.7.9.5

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[PATCH v2 09/15] drm/i915: add VLV DSI PLL Calculations

[Jani Nikula]

From: ymohanma <yogesh.mohan.marimuthu@intel.com>

v2:
 - Grab dpio_lock mutex in vlv_enable_dsi_pll().
 - Add and call vlv_disable_dsi_pll().

Signed-off-by: ymohanma <yogesh.mohan.marimuthu@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/Makefile        |    1 +
 drivers/gpu/drm/i915/i915_reg.h      |   10 ++
 drivers/gpu/drm/i915/intel_dsi.c     |    7 +
 drivers/gpu/drm/i915/intel_dsi.h     |    3 +
 drivers/gpu/drm/i915/intel_dsi_pll.c |  310 ++++++++++++++++++++++++++++++++++
 5 files changed, 331 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/intel_dsi_pll.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 5864c5b..65e60d2 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -23,6 +23,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
 	  intel_lvds.o \
 	  intel_dsi.o \
 	  intel_dsi_cmd.o \
+	  intel_dsi_pll.o \
 	  intel_bios.o \
 	  intel_ddi.o \
 	  intel_dp.o \
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9879619..5feed04 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -390,6 +390,16 @@
 #define   FB_FMAX_VMIN_FREQ_LO_SHIFT		27
 #define   FB_FMAX_VMIN_FREQ_LO_MASK		0xf8000000
 
+/* vlv2 north clock has */
+#define CCK_REG_DSI_PLL_FUSE			0x44
+#define CCK_REG_DSI_PLL_CONTROL			0x48
+#define  DSI_PLL_VCO_EN				(1 << 31)
+#define  DSI_PLL_LDO_GATE			(1 << 30)
+#define  DSI_PLL_P1_POST_DIV_SHIFT		17
+#define  DSI_PLL_P1_POST_DIV_MASK		(0x1ff << 17)
+#define  DSI_PLL_LOCK				(1 << 0)
+#define CCK_REG_DSI_PLL_DIVIDER			0x4c
+
 /*
  * DPIO - a special bus for various display related registers to hide behind
  *
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index d7eddbd..352ff46 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -83,6 +83,8 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
 static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)
 {
 	DRM_DEBUG_KMS("\n");
+
+	vlv_enable_dsi_pll(encoder);
 }
 
 static void intel_dsi_pre_enable(struct intel_encoder *encoder)
@@ -161,6 +163,8 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
 static void intel_dsi_post_disable(struct intel_encoder *encoder)
 {
 	DRM_DEBUG_KMS("\n");
+
+	vlv_disable_dsi_pll(encoder);
 }
 
 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
@@ -284,6 +288,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
 
 	DRM_DEBUG_KMS("pipe %d\n", pipe);
 
+	/* Update the DSI PLL */
+	vlv_enable_dsi_pll(intel_encoder);
+
 	/* escape clock divider, 20MHz, shared for A and C. device ready must be
 	 * off when doing this! txclkesc? */
 	tmp = I915_READ(MIPI_CTRL(0));
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index f308269..c7765f3 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -96,4 +96,7 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 	return container_of(encoder, struct intel_dsi, base.base);
 }
 
+extern void vlv_enable_dsi_pll(struct intel_encoder *encoder);
+extern void vlv_disable_dsi_pll(struct intel_encoder *encoder);
+
 #endif /* _INTEL_DSI_H */
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
new file mode 100644
index 0000000..c50a90e
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -0,0 +1,310 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *	Shobhit Kumar <shobhit.kumar@intel.com>
+ *	Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
+ */
+
+#include <linux/kernel.h>
+#include "intel_drv.h"
+#include "i915_drv.h"
+#include "intel_dsi.h"
+
+#define DSI_HSS_PACKET_SIZE		4
+#define DSI_HSE_PACKET_SIZE		4
+#define DSI_HSA_PACKET_EXTRA_SIZE	6
+#define DSI_HBP_PACKET_EXTRA_SIZE	6
+#define DSI_HACTIVE_PACKET_EXTRA_SIZE	6
+#define DSI_HFP_PACKET_EXTRA_SIZE	6
+#define DSI_EOTP_PACKET_SIZE		4
+
+struct dsi_clock_table {
+	u32 freq;
+	u8 m;
+	u8 p;
+};
+
+struct dsi_mnp {
+	u32 dsi_pll_ctrl;
+	u32 dsi_pll_div;
+};
+
+static u32 lfsr_converts[] = {
+	426, 469, 234, 373, 442, 221, 110, 311, 411,		/* 62 - 70 */
+	461, 486, 243, 377, 188, 350, 175, 343, 427, 213,	/* 71 - 80 */
+	106, 53, 282, 397, 354, 227, 113, 56, 284, 142,		/* 81 - 90 */
+	71, 35							/* 91 - 92 */
+};
+
+struct dsi_clock_table dsi_clk_tbl[] = {
+	{300, 72, 6}, {313, 75, 6}, {323, 78, 6}, {333, 80, 6},
+	{343, 82, 6}, {353, 85, 6}, {363, 87, 6}, {373, 90, 6},
+	{383, 92, 6}, {390, 78, 5}, {393, 79, 5}, {400, 80, 5},
+	{401, 80, 5}, {402, 80, 5}, {403, 81, 5}, {404, 81, 5},
+	{405, 81, 5}, {406, 81, 5}, {407, 81, 5}, {408, 82, 5},
+	{409, 82, 5}, {410, 82, 5}, {411, 82, 5}, {412, 82, 5},
+	{413, 83, 5}, {414, 83, 5}, {415, 83, 5}, {416, 83, 5},
+	{417, 83, 5}, {418, 84, 5}, {419, 84, 5}, {420, 84, 5},
+	{430, 86, 5}, {440, 88, 5}, {450, 90, 5}, {460, 92, 5},
+	{470, 75, 4}, {480, 77, 4}, {490, 78, 4}, {500, 80, 4},
+	{510, 82, 4}, {520, 83, 4}, {530, 85, 4}, {540, 86, 4},
+	{550, 88, 4}, {560, 90, 4}, {570, 91, 4}, {580, 70, 3},
+	{590, 71, 3}, {600, 72, 3}, {610, 73, 3}, {620, 74, 3},
+	{630, 76, 3}, {640, 77, 3}, {650, 78, 3}, {660, 79, 3},
+	{670, 80, 3}, {680, 82, 3}, {690, 83, 3}, {700, 84, 3},
+	{710, 85, 3}, {720, 86, 3}, {730, 88, 3}, {740, 89, 3},
+	{750, 90, 3}, {760, 91, 3}, {770, 92, 3}, {780, 62, 2},
+	{790, 63, 2}, {800, 64, 2}, {880, 70, 2}, {900, 72, 2},
+	{1000, 80, 2},		/* dsi clock frequency in Mhz*/
+};
+
+static u32 dsi_rr_formula(struct drm_display_mode *mode,
+			  int pixel_format, int video_mode_format,
+			  int lane_count, bool eotp)
+{
+	u32 bpp;
+	u32 hactive, vactive, hfp, hsync, hbp, vfp, vsync, vbp;
+	u32 hsync_bytes, hbp_bytes, hactive_bytes, hfp_bytes;
+	u32 bytes_per_line, bytes_per_frame;
+	u32 num_frames;
+	u32 bytes_per_x_frames, bytes_per_x_frames_x_lanes;
+	u32 dsi_bit_clock_hz;
+	u32 dsi_clk;
+
+	switch (pixel_format) {
+	default:
+	case VID_MODE_FORMAT_RGB888:
+	case VID_MODE_FORMAT_RGB666_LOOSE:
+		bpp = 24;
+		break;
+	case VID_MODE_FORMAT_RGB666:
+		bpp = 18;
+		break;
+	case VID_MODE_FORMAT_RGB565:
+		bpp = 16;
+		break;
+	}
+
+	hactive = mode->hdisplay;
+	vactive = mode->vdisplay;
+	hfp = mode->hsync_start - mode->hdisplay;
+	hsync = mode->hsync_end - mode->hsync_start;
+	hbp = mode->htotal - mode->hsync_end;
+
+	vfp = mode->vsync_start - mode->vdisplay;
+	vsync = mode->vsync_end - mode->vsync_start;
+	vbp = mode->vtotal - mode->vsync_end;
+
+	hsync_bytes = DIV_ROUND_UP(hsync * bpp, 8);
+	hbp_bytes = DIV_ROUND_UP(hbp * bpp, 8);
+	hactive_bytes = DIV_ROUND_UP(hactive * bpp, 8);
+	hfp_bytes = DIV_ROUND_UP(hfp * bpp, 8);
+
+	bytes_per_line = DSI_HSS_PACKET_SIZE + hsync_bytes +
+		DSI_HSA_PACKET_EXTRA_SIZE + DSI_HSE_PACKET_SIZE +
+		hbp_bytes + DSI_HBP_PACKET_EXTRA_SIZE +
+		hactive_bytes + DSI_HACTIVE_PACKET_EXTRA_SIZE +
+		hfp_bytes + DSI_HFP_PACKET_EXTRA_SIZE;
+
+	/*
+	 * XXX: Need to accurately calculate LP to HS transition timeout and add
+	 * it to bytes_per_line/bytes_per_frame.
+	 */
+
+	if (eotp && video_mode_format == VIDEO_MODE_BURST)
+		bytes_per_line += DSI_EOTP_PACKET_SIZE;
+
+	bytes_per_frame = vsync * bytes_per_line + vbp * bytes_per_line +
+		vactive * bytes_per_line + vfp * bytes_per_line;
+
+	if (eotp &&
+	    (video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE ||
+	     video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS))
+		bytes_per_frame += DSI_EOTP_PACKET_SIZE;
+
+	num_frames = (mode->clock * 1000) / (mode->htotal * mode->vtotal);
+	bytes_per_x_frames = num_frames * bytes_per_frame;
+
+	bytes_per_x_frames_x_lanes = bytes_per_x_frames / lane_count;
+
+	/* the dsi clock is divided by 2 in the hardware to get dsi ddr clock */
+	dsi_bit_clock_hz = bytes_per_x_frames_x_lanes * 8;
+	dsi_clk = dsi_bit_clock_hz / (1000 * 1000);
+
+	if (eotp && video_mode_format == VIDEO_MODE_BURST)
+		dsi_clk *= 2;
+
+	return dsi_clk;
+}
+
+static int mnp_from_clk_table(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
+{
+	unsigned int i;
+	u8 m;
+	u8 n;
+	u8 p;
+	u32 m_seed;
+
+	if (dsi_clk < 300 || dsi_clk > 1000)
+		return -ECHRNG;
+
+	for (i = 0; i <= ARRAY_SIZE(dsi_clk_tbl); i++) {
+		if (dsi_clk_tbl[i].freq > dsi_clk)
+			break;
+	}
+
+	m = dsi_clk_tbl[i].m;
+	p = dsi_clk_tbl[i].p;
+	m_seed = lfsr_converts[m - 62];
+	n = 1;
+	dsi_mnp->dsi_pll_ctrl = (1 << (17 + p - 2)) | (1 << 8);
+	dsi_mnp->dsi_pll_div = ((n - 1) << 16) | m_seed;
+
+	return 0;
+}
+
+static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
+{
+	u32 m, n, p;
+	u32 ref_clk;
+	u32 error;
+	u32 tmp_error;
+	u32 target_dsi_clk;
+	u32 calc_dsi_clk;
+	u32 calc_m;
+	u32 calc_p;
+	u32 m_seed;
+
+	if (dsi_clk < 300 || dsi_clk > 1150) {
+		DRM_ERROR("DSI CLK Out of Range\n");
+		return -ECHRNG;
+	}
+
+	ref_clk = 25000;
+	target_dsi_clk = dsi_clk * 1000;
+	error = 0xFFFFFFFF;
+	tmp_error = 0xFFFFFFFF;
+	calc_m = 0;
+	calc_p = 0;
+
+	for (m = 62; m <= 92; m++) {
+		for (p = 2; p <= 6; p++) {
+
+			calc_dsi_clk = (m * ref_clk) / p;
+			if (calc_dsi_clk >= target_dsi_clk) {
+				tmp_error = calc_dsi_clk - target_dsi_clk;
+				if (tmp_error < error) {
+					error = tmp_error;
+					calc_m = m;
+					calc_p = p;
+				}
+			}
+		}
+	}
+
+	m_seed = lfsr_converts[calc_m - 62];
+	n = 1;
+	dsi_mnp->dsi_pll_ctrl = (1 << (17 + calc_p - 2)) | (1 << 8);
+	dsi_mnp->dsi_pll_div = ((n - 1) << 16) | m_seed;
+
+	return 0;
+}
+
+static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+	struct drm_display_mode *mode = &intel_crtc->config.requested_mode;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	int ret;
+	struct dsi_mnp dsi_mnp;
+	u32 dsi_clk;
+
+	dsi_clk = dsi_rr_formula(mode, intel_dsi->pixel_format,
+				 intel_dsi->video_mode_format,
+				 intel_dsi->lane_count, !intel_dsi->eot_disable);
+
+#if 0
+	ret = mnp_from_clk_table(dsi_clk, &dsi_mnp);
+#else
+	ret = dsi_calc_mnp(dsi_clk, &dsi_mnp);
+#endif
+
+	if (ret) {
+		DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
+		return;
+	}
+
+	DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n",
+		      dsi_mnp.dsi_pll_div, dsi_mnp.dsi_pll_ctrl);
+
+	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
+	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, dsi_mnp.dsi_pll_div);
+	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, dsi_mnp.dsi_pll_ctrl);
+}
+
+void vlv_enable_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+	int pipe = intel_crtc->pipe;
+	u32 tmp;
+
+	DRM_DEBUG_KMS("\n");
+
+	mutex_lock(&dev_priv->dpio_lock);
+
+	vlv_configure_dsi_pll(encoder);
+
+	/* wait 0.5us after ungating before enabling again */
+	udelay(1 * 1000);
+
+	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
+	tmp |= DSI_PLL_VCO_EN;
+	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
+
+	mutex_unlock(&dev_priv->dpio_lock);
+
+	if (wait_for(I915_READ(PIPECONF(pipe)) & PIPECONF_DSI_PLL_LOCKED, 20)) {
+		DRM_ERROR("DSI PLL lock failed\n");
+		return;
+	}
+
+	DRM_DEBUG_KMS("DSI PLL locked\n");
+}
+
+void vlv_disable_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	u32 tmp;
+
+	DRM_DEBUG_KMS("\n");
+
+	mutex_lock(&dev_priv->dpio_lock);
+
+	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
+	tmp &= ~DSI_PLL_VCO_EN;
+	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
+
+	mutex_unlock(&dev_priv->dpio_lock);
+}
-- 
1.7.9.5

_______________________________________________
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http://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 10/15] drm/i915: fix PLL assertions for DSI PLL

[Jani Nikula]

For DSI, we need to be asserting DSI PLL, not DPLL.

This is a somewhat stopgap implementation. It's slightly ugly to have to
pass the dsi parameter to intel_enable_pipe().

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   44 +++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 00114a5..2264a13 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -929,6 +929,24 @@ void assert_pll(struct drm_i915_private *dev_priv,
 	     state_string(state), state_string(cur_state));
 }
 
+/* XXX: the dsi pll is shared between MIPI DSI ports */
+static void assert_dsi_pll(struct drm_i915_private *dev_priv, bool state)
+{
+	u32 val;
+	bool cur_state;
+
+	mutex_lock(&dev_priv->dpio_lock);
+	val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
+	mutex_unlock(&dev_priv->dpio_lock);
+
+	cur_state = val & DSI_PLL_VCO_EN;
+	WARN(cur_state != state,
+	     "DSI PLL state assertion failure (expected %s, current %s)\n",
+	     state_string(state), state_string(cur_state));
+}
+#define assert_dsi_pll_enabled(d) assert_dsi_pll(d, true)
+#define assert_dsi_pll_disabled(d) assert_dsi_pll(d, false)
+
 struct intel_shared_dpll *
 intel_crtc_to_shared_dpll(struct intel_crtc *crtc)
 {
@@ -1661,7 +1679,7 @@ static void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
  * returning.
  */
 static void intel_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe,
-			      bool pch_port)
+			      bool pch_port, bool dsi)
 {
 	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
 								      pipe);
@@ -1683,7 +1701,10 @@ static void intel_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe,
 	 * need the check.
 	 */
 	if (!HAS_PCH_SPLIT(dev_priv->dev))
-		assert_pll_enabled(dev_priv, pipe);
+		if (dsi)
+			assert_dsi_pll_enabled(dev_priv);
+		else
+			assert_pll_enabled(dev_priv, pipe);
 	else {
 		if (pch_port) {
 			/* if driving the PCH, we need FDI enabled */
@@ -3280,7 +3301,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
 	intel_crtc_load_lut(crtc);
 
 	intel_enable_pipe(dev_priv, pipe,
-			  intel_crtc->config.has_pch_encoder);
+			  intel_crtc->config.has_pch_encoder, false);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
 	intel_crtc_update_cursor(crtc, true);
@@ -3388,7 +3409,7 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
 	intel_ddi_enable_transcoder_func(crtc);
 
 	intel_enable_pipe(dev_priv, pipe,
-			  intel_crtc->config.has_pch_encoder);
+			  intel_crtc->config.has_pch_encoder, false);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
 	intel_crtc_update_cursor(crtc, true);
@@ -3646,6 +3667,7 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 	struct intel_encoder *encoder;
 	int pipe = intel_crtc->pipe;
 	int plane = intel_crtc->plane;
+	bool is_dsi;
 
 	WARN_ON(!crtc->enabled);
 
@@ -3659,6 +3681,8 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 		if (encoder->pre_pll_enable)
 			encoder->pre_pll_enable(encoder);
 
+	is_dsi = intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI);
+
 	vlv_enable_pll(intel_crtc);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
@@ -3669,7 +3693,7 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 
 	intel_crtc_load_lut(crtc);
 
-	intel_enable_pipe(dev_priv, pipe, false);
+	intel_enable_pipe(dev_priv, pipe, false, is_dsi);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
 	intel_crtc_update_cursor(crtc, true);
@@ -3707,7 +3731,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
 
 	intel_crtc_load_lut(crtc);
 
-	intel_enable_pipe(dev_priv, pipe, false);
+	intel_enable_pipe(dev_priv, pipe, false, false);
 	intel_enable_plane(dev_priv, plane, pipe);
 	intel_enable_planes(crtc);
 	/* The fixup needs to happen before cursor is enabled */
@@ -6494,8 +6518,12 @@ void intel_crtc_load_lut(struct drm_crtc *crtc)
 	if (!crtc->enabled || !intel_crtc->active)
 		return;
 
-	if (!HAS_PCH_SPLIT(dev_priv->dev))
-		assert_pll_enabled(dev_priv, pipe);
+	if (!HAS_PCH_SPLIT(dev_priv->dev)) {
+		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI))
+			assert_dsi_pll_enabled(dev_priv);
+		else
+			assert_pll_enabled(dev_priv, pipe);
+	}
 
 	/* use legacy palette for Ironlake */
 	if (HAS_PCH_SPLIT(dev))
-- 
1.7.9.5

[PATCH v2 11/15] drm/i915: don't enable DPLL for DSI

[Jani Nikula]

DPLL is not needed for DSI

v2: Rebase due to added DSI PLL assertion patch.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   48 ++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2264a13..336bee4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3683,7 +3683,8 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 
 	is_dsi = intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI);
 
-	vlv_enable_pll(intel_crtc);
+	if (!is_dsi)
+		vlv_enable_pll(intel_crtc);
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->pre_enable)
@@ -3798,7 +3799,8 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 		if (encoder->post_disable)
 			encoder->post_disable(encoder);
 
-	i9xx_disable_pll(dev_priv, pipe);
+	if (!intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI))
+		i9xx_disable_pll(dev_priv, pipe);
 
 	intel_crtc->active = false;
 	intel_update_fbc(dev);
@@ -4866,7 +4868,7 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 	intel_clock_t clock, reduced_clock;
 	u32 dspcntr;
 	bool ok, has_reduced_clock = false;
-	bool is_lvds = false;
+	bool is_lvds = false, is_dsi = false;
 	struct intel_encoder *encoder;
 	const intel_limit_t *limit;
 	int ret;
@@ -4876,6 +4878,9 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 		case INTEL_OUTPUT_LVDS:
 			is_lvds = true;
 			break;
+		case INTEL_OUTPUT_DSI:
+			is_dsi = true;
+			break;
 		}
 
 		num_connectors++;
@@ -4883,18 +4888,21 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 
 	refclk = i9xx_get_refclk(crtc, num_connectors);
 
-	/*
-	 * Returns a set of divisors for the desired target clock with the given
-	 * refclk, or FALSE.  The returned values represent the clock equation:
-	 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
-	 */
-	limit = intel_limit(crtc, refclk);
-	ok = dev_priv->display.find_dpll(limit, crtc,
-					 intel_crtc->config.port_clock,
-					 refclk, NULL, &clock);
-	if (!ok && !intel_crtc->config.clock_set) {
-		DRM_ERROR("Couldn't find PLL settings for mode!\n");
-		return -EINVAL;
+	if (!is_dsi) {
+		/*
+		 * Returns a set of divisors for the desired target clock with
+		 * the given refclk, or FALSE.  The returned values represent
+		 * the clock equation: reflck * (5 * (m1 + 2) + (m2 + 2)) / (n +
+		 * 2) / p1 / p2.
+		 */
+		limit = intel_limit(crtc, refclk);
+		ok = dev_priv->display.find_dpll(limit, crtc,
+						 intel_crtc->config.port_clock,
+						 refclk, NULL, &clock);
+		if (!ok && !intel_crtc->config.clock_set) {
+			DRM_ERROR("Couldn't find PLL settings for mode!\n");
+			return -EINVAL;
+		}
 	}
 
 	/* Ensure that the cursor is valid for the new mode before changing... */
@@ -4922,16 +4930,18 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 		intel_crtc->config.dpll.p2 = clock.p2;
 	}
 
-	if (IS_GEN2(dev))
+	if (IS_GEN2(dev)) {
 		i8xx_update_pll(intel_crtc,
 				has_reduced_clock ? &reduced_clock : NULL,
 				num_connectors);
-	else if (IS_VALLEYVIEW(dev))
-		vlv_update_pll(intel_crtc);
-	else
+	} else if (IS_VALLEYVIEW(dev)) {
+		if (!is_dsi)
+			vlv_update_pll(intel_crtc);
+	} else {
 		i9xx_update_pll(intel_crtc,
 				has_reduced_clock ? &reduced_clock : NULL,
                                 num_connectors);
+	}
 
 	/* Set up the display plane register */
 	dspcntr = DISPPLANE_GAMMA_ENABLE;
-- 
1.7.9.5

[PATCH v2 12/15] drm/i915: Band Gap WA

[Jani Nikula]

From: Shobhit Kumar <shobhit.kumar@intel.com>

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: ymohanma <yogesh.mohan.marimuthu@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/intel_dsi.c |   48 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 352ff46..676b310 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -37,6 +37,51 @@
 static const struct intel_dsi_device intel_dsi_devices[] = {
 };
 
+
+static void vlv_cck_modify(struct drm_i915_private *dev_priv, u32 reg, u32 val,
+			   u32 mask)
+{
+	u32 tmp = vlv_cck_read(dev_priv, reg);
+	tmp &= ~mask;
+	tmp |= val;
+	vlv_cck_write(dev_priv, reg, tmp);
+}
+
+static void band_gap_wa(struct drm_i915_private *dev_priv)
+{
+	mutex_lock(&dev_priv->dpio_lock);
+
+	/* Enable bandgap fix in GOP driver */
+	vlv_cck_modify(dev_priv, 0x6D, 0x00010000, 0x00030000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x6E, 0x00010000, 0x00030000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x6F, 0x00010000, 0x00030000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x00, 0x00008000, 0x00008000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x00, 0x00000000, 0x00008000);
+	msleep(20);
+
+	/* Turn Display Trunk on */
+	vlv_cck_modify(dev_priv, 0x6B, 0x00020000, 0x00030000);
+	msleep(20);
+
+	vlv_cck_modify(dev_priv, 0x6C, 0x00020000, 0x00030000);
+	msleep(20);
+
+	vlv_cck_modify(dev_priv, 0x6D, 0x00020000, 0x00030000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x6E, 0x00020000, 0x00030000);
+	msleep(20);
+	vlv_cck_modify(dev_priv, 0x6F, 0x00020000, 0x00030000);
+
+	mutex_unlock(&dev_priv->dpio_lock);
+
+	/* Need huge delay, otherwise clock is not stable */
+	msleep(100);
+}
+
 static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)
 {
 	return container_of(intel_attached_encoder(connector),
@@ -291,6 +336,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
 	/* Update the DSI PLL */
 	vlv_enable_dsi_pll(intel_encoder);
 
+	/* XXX: Location of the call */
+	band_gap_wa(dev_priv);
+
 	/* escape clock divider, 20MHz, shared for A and C. device ready must be
 	 * off when doing this! txclkesc? */
 	tmp = I915_READ(MIPI_CTRL(0));
-- 
1.7.9.5

[PATCH v2 13/15] drm/i915: Parse the MIPI related VBT Block and store relevant info

[Jani Nikula]

From: Shobhit Kumar <shobhit.kumar@intel.com>

Initial parsing of the VBT MIPI block. For now, just store the panel id
if found.

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |    5 +++++
 drivers/gpu/drm/i915/intel_bios.c |   16 +++++++++++++++
 drivers/gpu/drm/i915/intel_bios.h |   41 +++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 96c875b..ea80133 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1064,6 +1064,11 @@ struct intel_vbt_data {
 	int edp_bpp;
 	struct edp_power_seq edp_pps;
 
+	/* MIPI DSI */
+	struct {
+		u16 panel_id;
+	} dsi;
+
 	int crt_ddc_pin;
 
 	int child_dev_num;
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 53f2bed..6668873 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -569,6 +569,21 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 }
 
 static void
+parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+{
+	struct bdb_mipi *mipi;
+
+	mipi = find_section(bdb, BDB_MIPI);
+	if (!mipi) {
+		DRM_DEBUG_KMS("No MIPI BDB found");
+		return;
+	}
+
+	/* XXX: add more info */
+	dev_priv->vbt.dsi.panel_id = mipi->panel_id;
+}
+
+static void
 parse_device_mapping(struct drm_i915_private *dev_priv,
 		       struct bdb_header *bdb)
 {
@@ -745,6 +760,7 @@ intel_parse_bios(struct drm_device *dev)
 	parse_device_mapping(dev_priv, bdb);
 	parse_driver_features(dev_priv, bdb);
 	parse_edp(dev_priv, bdb);
+	parse_mipi(dev_priv, bdb);
 
 	if (bios)
 		pci_unmap_rom(pdev, bios);
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index e088d6f..6e9250e 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -104,6 +104,7 @@ struct vbios_data {
 #define BDB_LVDS_LFP_DATA	 42
 #define BDB_LVDS_BACKLIGHT	 43
 #define BDB_LVDS_POWER		 44
+#define BDB_MIPI		 50
 #define BDB_SKIP		254 /* VBIOS private block, ignore */
 
 struct bdb_general_features {
@@ -618,4 +619,44 @@ int intel_parse_bios(struct drm_device *dev);
 #define		PORT_IDPC	8
 #define		PORT_IDPD	9
 
+/* MIPI DSI panel info */
+struct bdb_mipi {
+	u16 panel_id;
+	u16 bridge_revision;
+
+	/* General params */
+	u32 dithering:1;
+	u32 bpp_pixel_format:1;
+	u32 rsvd1:1;
+	u32 dphy_valid:1;
+	u32 resvd2:28;
+
+	u16 port_info;
+	u16 rsvd3:2;
+	u16 num_lanes:2;
+	u16 rsvd4:12;
+
+	/* DSI config */
+	u16 virt_ch_num:2;
+	u16 vtm:2;
+	u16 rsvd5:12;
+
+	u32 dsi_clock;
+	u32 bridge_ref_clk;
+	u16 rsvd_pwr;
+
+	/* Dphy Params */
+	u32 prepare_cnt:5;
+	u32 rsvd6:3;
+	u32 clk_zero_cnt:8;
+	u32 trail_cnt:5;
+	u32 rsvd7:3;
+	u32 exit_zero_cnt:6;
+	u32 rsvd8:2;
+
+	u32 hl_switch_cnt;
+	u32 lp_byte_clk;
+	u32 clk_lane_switch_cnt;
+} __attribute__((packed));
+
 #endif /* _I830_BIOS_H_ */
-- 
1.7.9.5

[PATCH v2 14/15] drm/i915: initialize DSI output on VLV

[Jani Nikula]

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 336bee4..2f00c98 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9386,6 +9386,8 @@ static void intel_setup_outputs(struct drm_device *dev)
 			if (I915_READ(VLV_DISPLAY_BASE + DP_B) & DP_DETECTED)
 				intel_dp_init(dev, VLV_DISPLAY_BASE + DP_B, PORT_B);
 		}
+
+		intel_dsi_init(dev);
 	} else if (SUPPORTS_DIGITAL_OUTPUTS(dev)) {
 		bool found = false;
 
-- 
1.7.9.5

[PATCH v2 15/15] drm/i915: add AUO MIPI DSI display sub-encoder

[Jani Nikula]

From: Shobhit Kumar <shobhit.kumar@intel.com>

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/Makefile          |    1 +
 drivers/gpu/drm/i915/auo_dsi_display.c |  182 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dsi.c       |    5 +
 drivers/gpu/drm/i915/intel_dsi.h       |    3 +
 4 files changed, 191 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/auo_dsi_display.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 65e60d2..18bf236 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -42,6 +42,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
 	  intel_opregion.o \
 	  intel_sideband.o \
 	  intel_uncore.o \
+	  auo_dsi_display.o \
 	  dvo_ch7xxx.o \
 	  dvo_ch7017.o \
 	  dvo_ivch.o \
diff --git a/drivers/gpu/drm/i915/auo_dsi_display.c b/drivers/gpu/drm/i915/auo_dsi_display.c
new file mode 100644
index 0000000..771a725
--- /dev/null
+++ b/drivers/gpu/drm/i915/auo_dsi_display.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Jani Nikula <jani.nikula@intel.com>
+ *	   Shobhit Kumar <shobhit.kumar@intel.com>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
+#include <drm/i915_drm.h>
+#include <linux/slab.h>
+#include <video/mipi_display.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include "intel_dsi.h"
+#include "intel_dsi_cmd.h"
+
+#if 0 /* XXX */
+static void auo_vid_get_panel_info(int pipe, struct drm_connector *connector)
+{
+	DRM_DEBUG_KMS("\n");
+	if (!connector)
+		return;
+
+	if (pipe == 0) {
+		connector->display_info.width_mm = 216;
+		connector->display_info.height_mm = 135;
+	}
+
+	return;
+}
+#endif
+
+static bool auo_init(struct intel_dsi_device *dsi)
+{
+	struct intel_dsi *intel_dsi = container_of(dsi, struct intel_dsi, dev);
+
+	DRM_DEBUG_KMS("\n");
+
+	intel_dsi->eot_disable = 0;
+	intel_dsi->pixel_format = VID_MODE_FORMAT_RGB888;
+	intel_dsi->video_mode_format = VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE;
+	intel_dsi->lane_count = 4;
+
+	return true;
+}
+
+static void auo_enable(struct intel_dsi_device *dsi)
+{
+	struct intel_dsi *intel_dsi = container_of(dsi, struct intel_dsi, dev);
+
+	DRM_DEBUG_KMS("\n");
+
+	dsi_vc_dcs_write_0(intel_dsi, 0, MIPI_DCS_EXIT_SLEEP_MODE);
+
+	dsi_vc_dcs_write_1(intel_dsi, 0, MIPI_DCS_SET_TEAR_ON, 0x00);
+
+	dsi_vc_dcs_write_0(intel_dsi, 0, MIPI_DCS_SET_DISPLAY_ON);
+	dsi_vc_dcs_write_1(intel_dsi, 0, 0x14, 0x55);
+}
+
+static void auo_disable(struct intel_dsi_device *dsi)
+{
+	struct intel_dsi *intel_dsi = container_of(dsi, struct intel_dsi, dev);
+
+	DRM_DEBUG_KMS("\n");
+
+	dsi_vc_dcs_write_0(intel_dsi, 0, MIPI_DCS_SET_DISPLAY_OFF);
+	dsi_vc_dcs_write_0(intel_dsi, 0, MIPI_DCS_ENTER_SLEEP_MODE);
+}
+
+static int auo_mode_valid(struct intel_dsi_device *dsi,
+			  struct drm_display_mode *mode)
+{
+	return MODE_OK;
+}
+
+static bool auo_mode_fixup(struct intel_dsi_device *dsi,
+			   const struct drm_display_mode *mode,
+			   struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void auo_mode_set(struct intel_dsi_device *dsi,
+			 struct drm_display_mode *mode,
+			 struct drm_display_mode *adjusted_mode)
+{
+}
+
+static enum drm_connector_status auo_detect(struct intel_dsi_device *dsi)
+{
+	return connector_status_connected;
+}
+
+static bool auo_get_hw_state(struct intel_dsi_device *dev)
+{
+	return true;
+}
+
+static struct drm_display_mode *auo_get_modes(struct intel_dsi_device *dsi)
+{
+	struct drm_display_mode *mode = NULL;
+	u32 hblank = 0x78;
+	u32 vblank = 0x0C;
+	u32 hsync_offset = 0x28;
+	u32 hsync_width  = 0x28;
+	u32 vsync_offset = 0x4;
+	u32 vsync_width  = 0x4;
+
+	/* Allocate */
+	mode = kzalloc(sizeof(*mode), GFP_KERNEL);
+	if (!mode) {
+		DRM_DEBUG_KMS("AUO Panel: No memory\n");
+		return NULL;
+	}
+
+	/* Hardcode 1920x1200*/
+	strcpy(mode->name, "1920x1200");
+	mode->hdisplay = 0x780;
+	mode->vdisplay = 0x4B0;
+	mode->vrefresh = 60;
+	mode->clock =  148350;
+
+	/* Calculate */
+	mode->hsync_start = mode->hdisplay + hsync_offset;
+	mode->hsync_end = mode->hdisplay + hsync_offset
+		+ hsync_width;
+	mode->htotal = mode->hdisplay + hblank;
+	mode->vsync_start = mode->vdisplay + vsync_offset;
+	mode->vsync_end = mode->vdisplay + vsync_offset
+		+ vsync_width;
+	mode->vtotal = mode->vdisplay + vblank;
+
+	/* Configure */
+	mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC;
+	mode->type |= DRM_MODE_TYPE_PREFERRED;
+	mode->status = MODE_OK;
+
+	return mode;
+}
+
+static void auo_destroy(struct intel_dsi_device *dsi)
+{
+}
+
+/* Callbacks. We might not need them all. */
+struct intel_dsi_dev_ops auo_dsi_display_ops = {
+	.init = auo_init,
+#if 0 /* XXX */
+	.get_info = auo_vid_get_panel_info,
+#endif
+	.enable = auo_enable,
+	.disable = auo_disable,
+	.mode_valid = auo_mode_valid,
+	.mode_fixup = auo_mode_fixup,
+	.mode_set = auo_mode_set,
+	.detect = auo_detect,
+	.get_hw_state = auo_get_hw_state,
+	.get_modes = auo_get_modes,
+	.destroy = auo_destroy,
+};
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 676b310..7e07ad9 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -35,6 +35,11 @@
 
 /* the sub-encoders aka panel drivers */
 static const struct intel_dsi_device intel_dsi_devices[] = {
+	{
+		.type = INTEL_DSI_VIDEO_MODE,
+		.name = "auo-dsi-vid-mode-display",
+		.dev_ops = &auo_dsi_display_ops,
+	},
 };
 
 
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index c7765f3..e1b5657 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -99,4 +99,7 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 extern void vlv_enable_dsi_pll(struct intel_encoder *encoder);
 extern void vlv_disable_dsi_pll(struct intel_encoder *encoder);
 
+/* the panel drivers */
+extern struct intel_dsi_dev_ops auo_dsi_display_ops;
+
 #endif /* _INTEL_DSI_H */
-- 
1.7.9.5

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH] drm: add MIPI DSI encoder and connector types

[Jani Nikula]

From: Shobhit Kumar <shobhit.kumar@intel.com>

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/drm_crtc.c  |    2 ++
 include/uapi/drm/drm_mode.h |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index a691764..dc279f4 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -209,6 +209,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] =
 	{ DRM_MODE_CONNECTOR_TV, "TV" },
 	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
+	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
 };
 
 static const struct drm_prop_enum_list drm_encoder_enum_list[] =
@@ -218,6 +219,7 @@ static const struct drm_prop_enum_list drm_encoder_enum_list[] =
 	{ DRM_MODE_ENCODER_LVDS, "LVDS" },
 	{ DRM_MODE_ENCODER_TVDAC, "TV" },
 	{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
+	{ DRM_MODE_ENCODER_DSI, "DSI" },
 };
 
 void drm_connector_ida_init(void)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 53db7ce..589114e 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -165,6 +165,7 @@ struct drm_mode_get_plane_res {
 #define DRM_MODE_ENCODER_LVDS	3
 #define DRM_MODE_ENCODER_TVDAC	4
 #define DRM_MODE_ENCODER_VIRTUAL 5
+#define DRM_MODE_ENCODER_DSI	6
 
 struct drm_mode_get_encoder {
 	__u32 encoder_id;
@@ -203,6 +204,7 @@ struct drm_mode_get_encoder {
 #define DRM_MODE_CONNECTOR_TV		13
 #define DRM_MODE_CONNECTOR_eDP		14
 #define DRM_MODE_CONNECTOR_VIRTUAL      15
+#define DRM_MODE_CONNECTOR_DSI		16
 
 struct drm_mode_get_connector {
 
-- 
1.7.9.5

Re: [PATCH v2 03/15] drm/i915: add VLV pipeconf bit definition for DSI PLL lock

[Ville Syrjälä]

On Fri, Aug 16, 2013 at 03:35:51PM +0300, Jani Nikula wrote:
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index b417a8c..2f8e341 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2972,6 +2972,7 @@
>  #define   PIPECONF_DISABLE	0
>  #define   PIPECONF_DOUBLE_WIDE	(1<<30)
>  #define   I965_PIPECONF_ACTIVE	(1<<30)
> +#define   PIPECONF_DSI_PLL_LOCKED	(1<<29) /* vlv only */

Maybe add a comment that it's only in the pipe A register
(at least according to spec).

>  #define   PIPECONF_FRAME_START_DELAY_MASK (3<<27)
>  #define   PIPECONF_SINGLE_WIDE	0
>  #define   PIPECONF_PIPE_UNLOCKED 0
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC

Re: [PATCH v2 07/15] drm/i915: add MIPI DSI command sending routines

[Ville Syrjälä]

On Fri, Aug 16, 2013 at 03:35:55PM +0300, Jani Nikula wrote:
> v2: Rebase due to register bit definition change.
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile        |    1 +
>  drivers/gpu/drm/i915/intel_dsi_cmd.c |  442 ++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_dsi_cmd.h |  109 +++++++++
>  3 files changed, 552 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.c
>  create mode 100644 drivers/gpu/drm/i915/intel_dsi_cmd.h
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index b8449a8..8bffd29 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -21,6 +21,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
>  	  intel_display.o \
>  	  intel_crt.o \
>  	  intel_lvds.o \
> +	  intel_dsi_cmd.o \
>  	  intel_bios.o \
>  	  intel_ddi.o \
>  	  intel_dp.o \
> diff --git a/drivers/gpu/drm/i915/intel_dsi_cmd.c b/drivers/gpu/drm/i915/intel_dsi_cmd.c
> new file mode 100644
> index 0000000..aca41c9
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_dsi_cmd.c
> @@ -0,0 +1,442 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Author: Jani Nikula <jani.nikula@intel.com>
> + */
> +
> +#include <linux/export.h>
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include <video/mipi_display.h>
> +#include "i915_drv.h"
> +#include "intel_drv.h"
> +#include "intel_dsi.h"
> +#include "intel_dsi_cmd.h"
> +
> +/*
> + * XXX: MIPI_DATA_ADDRESS, MIPI_DATA_LENGTH, MIPI_COMMAND_LENGTH, and
> + * MIPI_COMMAND_ADDRESS registers.
> + *
> + * Apparently these registers provide a MIPI adapter level way to send (lots of)
> + * commands and data to the receiver, without having to write the commands and
> + * data to MIPI_{HS,LP}_GEN_{CTRL,DATA} registers word by word.
> + *
> + * Presumably for anything other than MIPI_DCS_WRITE_MEMORY_START and
> + * MIPI_DCS_WRITE_MEMORY_CONTINUE (which are used to update the external
> + * framebuffer in command mode displays) these are just an optimization that can
> + * come later.
> + *
> + * For memory writes, these should probably be used for performance.
> + */
> +
> +static void print_stat(struct intel_dsi *intel_dsi)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 val;
> +
> +	val = I915_READ(MIPI_INTR_STAT(pipe));
> +
> +#define STAT_BIT(val, bit) (val) & (bit) ? " " #bit : ""
> +	DRM_DEBUG_KMS("MIPI_INTR_STAT(%d) = %08x"
> +		      "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s"
> +		      "\n", pipe, val,
> +		      STAT_BIT(val, TEARING_EFFECT),
> +		      STAT_BIT(val, SPL_PKT_SENT_INTERRUPT),
> +		      STAT_BIT(val, GEN_READ_DATA_AVAIL),
> +		      STAT_BIT(val, LP_GENERIC_WR_FIFO_FULL),
> +		      STAT_BIT(val, HS_GENERIC_WR_FIFO_FULL),
> +		      STAT_BIT(val, RX_PROT_VIOLATION),
> +		      STAT_BIT(val, RX_INVALID_TX_LENGTH),
> +		      STAT_BIT(val, ACK_WITH_NO_ERROR),
> +		      STAT_BIT(val, TURN_AROUND_ACK_TIMEOUT),
> +		      STAT_BIT(val, LP_RX_TIMEOUT),
> +		      STAT_BIT(val, HS_TX_TIMEOUT),
> +		      STAT_BIT(val, DPI_FIFO_UNDERRUN),
> +		      STAT_BIT(val, LOW_CONTENTION),
> +		      STAT_BIT(val, HIGH_CONTENTION),
> +		      STAT_BIT(val, TXDSI_VC_ID_INVALID),
> +		      STAT_BIT(val, TXDSI_DATA_TYPE_NOT_RECOGNISED),
> +		      STAT_BIT(val, TXCHECKSUM_ERROR),
> +		      STAT_BIT(val, TXECC_MULTIBIT_ERROR),
> +		      STAT_BIT(val, TXECC_SINGLE_BIT_ERROR),
> +		      STAT_BIT(val, TXFALSE_CONTROL_ERROR),
> +		      STAT_BIT(val, RXDSI_VC_ID_INVALID),
> +		      STAT_BIT(val, RXDSI_DATA_TYPE_NOT_REGOGNISED),
> +		      STAT_BIT(val, RXCHECKSUM_ERROR),
> +		      STAT_BIT(val, RXECC_MULTIBIT_ERROR),
> +		      STAT_BIT(val, RXECC_SINGLE_BIT_ERROR),
> +		      STAT_BIT(val, RXFALSE_CONTROL_ERROR),
> +		      STAT_BIT(val, RXHS_RECEIVE_TIMEOUT_ERROR),
> +		      STAT_BIT(val, RX_LP_TX_SYNC_ERROR),
> +		      STAT_BIT(val, RXEXCAPE_MODE_ENTRY_ERROR),
> +		      STAT_BIT(val, RXEOT_SYNC_ERROR),
> +		      STAT_BIT(val, RXSOT_SYNC_ERROR),
> +		      STAT_BIT(val, RXSOT_ERROR));
> +#undef STAT_BIT
> +}
> +
> +enum dsi_type {
> +	DSI_DCS,
> +	DSI_GENERIC,
> +};
> +
> +/* enable or disable command mode hs transmissions */
> +void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 temp;
> +	u32 mask = DBI_FIFO_EMPTY;
> +
> +	/* XXX: or wait for !full...? */

DBI FIFO must be empty before we write the MIPI_HS_LP_DBI_ENABLE.

> +	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50))
> +		DRM_ERROR("Timeout waiting for DBI FIFO empty\n");
> +
> +	temp = I915_READ(MIPI_HS_LP_DBI_ENABLE(pipe));
> +	temp &= DBI_HS_LP_MODE_MASK;
> +	I915_WRITE(MIPI_HS_LP_DBI_ENABLE(pipe), enable ? DBI_HS_MODE : DBI_LP_MODE);
> +
> +	intel_dsi->hs = enable;
> +}
> +
> +static int dsi_vc_send_short(struct intel_dsi *intel_dsi, int channel,
> +			     u8 data_type, u16 data)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 ctrl_reg;
> +	u32 ctrl;
> +	u32 mask;
> +
> +	DRM_DEBUG_KMS("channel %d, data_type %d, data %04x\n",
> +		      channel, data_type, data);
> +
> +	/* XXX: set MIPI_HS_LS_DBI_ENABLE? wait for dbi fifo empty first */
> +
> +	/* XXX: short write, do we need to wait for data FIFO? */

Not according to spec.

> +	if (intel_dsi->hs) {
> +		ctrl_reg = MIPI_HS_GEN_CTRL(pipe);
> +		mask = HS_CTRL_FIFO_FULL;
> +	} else {
> +		ctrl_reg = MIPI_LP_GEN_CTRL(pipe);
> +		mask = LP_CTRL_FIFO_FULL;
> +	}
> +
> +	/* Note: Could also wait for !full instead of empty. */

We _are_ waiting for !full.

> +	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50)) {
> +		DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
> +		print_stat(intel_dsi);
> +	}
> +
> +	ctrl = data << SHORT_PACKET_PARAM_SHIFT |
> +		channel << VIRTUAL_CHANNEL_SHIFT |
> +		data_type << DATA_TYPE_SHIFT;
> +
> +	I915_WRITE(ctrl_reg, ctrl);
> +
> +	return 0;
> +}
> +
> +static int dsi_vc_send_long(struct intel_dsi *intel_dsi, int channel,
> +			    u8 data_type, const u8 *data, u16 len)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 data_reg, ctrl_reg, ctrl;
> +	u16 i, j, n;
> +	u32 mask;
> +
> +	DRM_DEBUG_KMS("channel %d, data_type %d, len %04x\n",
> +		      channel, data_type, len);
> +
> +	/* XXX: set MIPI_HS_LS_DBI_ENABLE? wait for dbi fifo empty first */
> +
> +	if (intel_dsi->hs) {
> +		data_reg = MIPI_HS_GEN_DATA(pipe);
> +		ctrl_reg = MIPI_HS_GEN_CTRL(pipe);
> +		mask = HS_DATA_FIFO_FULL;
> +	} else {
> +		data_reg = MIPI_LP_GEN_DATA(pipe);
> +		ctrl_reg = MIPI_LP_GEN_CTRL(pipe);
> +		mask = LP_DATA_FIFO_FULL;
> +	}
> +
> +	/* Note: Could also wait for !full instead of empty. */

Same.

> +	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50))
> +		DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
> +
> +	for (i = 0; i < len; i += n) {
> +		u32 val = 0;
> +		n = min(len - i, 4);
> +
> +		for (j = 0; j < n; j++)
> +			val |= *data++ << 8 * j;
> +
> +		I915_WRITE(data_reg, val);
> +		/* XXX: check for data fifo full, once that is set, write 4
> +		 * dwords, then wait for not set, then continue. */

That's what the spec says. Not sure why we should write one more time
into the full FIFO though. Maybe it kicks something harder :)

> +	}
> +
> +	if (intel_dsi->hs)
> +		mask = HS_CTRL_FIFO_FULL;
> +	else
> +		mask = LP_CTRL_FIFO_FULL;
> +
> +	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == 0, 50))
> +		DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
> +
> +	ctrl = len << LONG_PACKET_WORD_COUNT_SHIFT;
> +	ctrl |= channel << VIRTUAL_CHANNEL_SHIFT;
> +	ctrl |= data_type << DATA_TYPE_SHIFT;

Could just be
 ctrl = foo << x |
       bar << y |
       ...

Or I suppose you could just call dsi_vc_send_short() here.

> +
> +	I915_WRITE(ctrl_reg, ctrl);
> +
> +	return 0;
> +}
> +
> +static int dsi_vc_write_common(struct intel_dsi *intel_dsi,
> +			       int channel, const u8 *data, int len,

Maybe size_t for len everywhere?

> +			       enum dsi_type type)
> +{
> +	int ret;
> +
> +	if (len == 0) {
> +		BUG_ON(type == DSI_GENERIC);
> +		ret = dsi_vc_send_short(intel_dsi, channel,
> +					MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM,
> +					0);
> +	} else if (len == 1) {
> +		ret = dsi_vc_send_short(intel_dsi, channel,
> +					type == DSI_GENERIC ?
> +					MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM :
> +					MIPI_DSI_DCS_SHORT_WRITE, data[0]);
> +	} else if (len == 2) {
> +		ret = dsi_vc_send_short(intel_dsi, channel,
> +					type == DSI_GENERIC ?
> +					MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM :
> +					MIPI_DSI_DCS_SHORT_WRITE_PARAM,
> +					(data[1] << 8) | data[0]);
> +	} else {
> +		ret = dsi_vc_send_long(intel_dsi, channel,
> +				       type == DSI_GENERIC ?
> +				       MIPI_DSI_GENERIC_LONG_WRITE :
> +				       MIPI_DSI_DCS_LONG_WRITE, data, len);
> +	}

Could use switch here like you do in dsi_vc_generic_send_read_request().

> +
> +	return ret;
> +}
> +
> +int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel,
> +		     const u8 *data, int len)
> +{
> +	return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_DCS);
> +}
> +
> +int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel,
> +			 const u8 *data, int len)
> +{
> +	return dsi_vc_write_common(intel_dsi, channel, data, len, DSI_GENERIC);
> +}
> +
> +static int dsi_vc_dcs_send_read_request(struct intel_dsi *intel_dsi,
> +					int channel, u8 dcs_cmd)
> +{
> +	return dsi_vc_send_short(intel_dsi, channel, MIPI_DSI_DCS_READ,
> +				 dcs_cmd);
> +}
> +
> +static int dsi_vc_generic_send_read_request(struct intel_dsi *intel_dsi,
> +					    int channel, u8 *reqdata,
> +					    int reqlen)
> +{
> +	u16 data;
> +	u8 data_type;
> +
> +	switch (reqlen) {
> +	case 0:
> +		data_type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
> +		data = 0;
> +		break;
> +	case 1:
> +		data_type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
> +		data = reqdata[0];
> +		break;
> +	case 2:
> +		data_type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
> +		data = (reqdata[1] << 8) | reqdata[0];
> +		break;
> +	default:
> +		BUG();
> +	}
> +
> +	return dsi_vc_send_short(intel_dsi, channel, data_type, data);
> +}
> +
> +static int dsi_read_data_return(struct intel_dsi *intel_dsi,
> +				u8 *buf, int buflen)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	int i, j, len = 0;
> +	u32 data_valid, val;
> +
> +	data_valid = I915_READ(MIPI_READ_DATA_VALID(pipe));
> +
> +	/* XXX: byte order of data in return registers? */
> +	for (i = 0; i < 8 && len < buflen; i++) {
> +		if (!(data_valid & (1 << i)))
> +			break;
> +
> +		val = I915_READ(MIPI_READ_DATA_RETURN(pipe, i));
> +		for (j = 0; j < 4 && len < buflen; j++, len++)
> +			buf[len] = val >> 8 * j;
> +	}
> +
> +	/* Clear the data valid bits. */
> +	I915_WRITE(MIPI_READ_DATA_VALID(pipe), data_valid);

Here we are using the registers not in the DSI IP but in the adapter
part. But we didn't use the adapter to send the command, so I'm
wondering if this can even work...

> +
> +	return len;
> +}
> +
> +int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd,
> +		    u8 *buf, int buflen)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 mask;
> +	int ret;
> +
> +	/* XXX: should issue multiple read requests and reads if request is
> +	 * longer than MIPI_MAX_RETURN_PKT_SIZE */
> +
> +	ret = dsi_vc_dcs_send_read_request(intel_dsi, channel, dcs_cmd);
> +	if (ret)
> +		return ret;
> +
> +	mask = GEN_READ_DATA_AVAIL;
> +	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50))
> +		DRM_ERROR("Timeout waiting for read data.\n");

We should clear the GEN_READ_DATA_AVAIL status somewhere. Spec says we
should clear it after polling, but "clear; initiate request; poll" would
seem an equally OK solution to me.

> +
> +	ret = dsi_read_data_return(intel_dsi, buf, buflen);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ret != buflen)
> +		return -EIO;
> +
> +	return 0;
> +}
> +
> +int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel,
> +			u8 *reqdata, int reqlen, u8 *buf, int buflen)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 mask;
> +	int ret;
> +
> +	/* XXX: should issue multiple read requests and reads if request is
> +	 * longer than MIPI_MAX_RETURN_PKT_SIZE.
> +	 */
> +
> +	ret = dsi_vc_generic_send_read_request(intel_dsi, channel, reqdata,
> +					       reqlen);
> +	if (ret)
> +		return ret;
> +
> +	mask = GEN_READ_DATA_AVAIL;
> +	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == mask, 50))
> +		DRM_ERROR("Timeout waiting for read data.\n");

Again we should clear this somewhere.

> +
> +	ret = dsi_read_data_return(intel_dsi, buf, buflen);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ret != buflen)
> +		return -EIO;
> +
> +	return 0;
> +}
> +
> +/*
> + * send a video mode command
> + *
> + * XXX: commands with data in MIPI_DPI_DATA?
> + */
> +int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd)
> +{
> +	struct drm_encoder *encoder = &intel_dsi->base.base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	u32 mask;
> +
> +	/* XXX: pipe, hs */
> +	if (intel_dsi->hs)
> +		cmd &= ~DPI_LP_MODE;
> +	else
> +		cmd |= DPI_LP_MODE;
> +
> +	/* DPI virtual channel?! */
> +
> +	mask = DPI_FIFO_EMPTY;
> +	if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(pipe)) & mask) == mask, 50))
> +		DRM_ERROR("Timeout waiting for DPI FIFO empty.\n");
> +
> +	/* clear bit */
> +	I915_WRITE(MIPI_INTR_STAT(pipe), SPL_PKT_SENT_INTERRUPT);
> +
> +	/* XXX: old code skips write if control unchanged */
> +	if (cmd == I915_READ(MIPI_DPI_CONTROL(pipe)))
> +		DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);
> +
> +	I915_WRITE(MIPI_DPI_CONTROL(pipe), cmd);
> +
> +	mask = SPL_PKT_SENT_INTERRUPT;
> +	if (wait_for((I915_READ(MIPI_INTR_STAT(pipe)) & mask) == 0, 50))
> +		DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/i915/intel_dsi_cmd.h b/drivers/gpu/drm/i915/intel_dsi_cmd.h
> new file mode 100644
> index 0000000..54c8a23
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_dsi_cmd.h
> @@ -0,0 +1,109 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Author: Jani Nikula <jani.nikula@intel.com>
> + */
> +
> +#ifndef _INTEL_DSI_DSI_H
> +#define _INTEL_DSI_DSI_H
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include <video/mipi_display.h>
> +#include "i915_drv.h"
> +#include "intel_drv.h"
> +#include "intel_dsi.h"
> +
> +void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable);
> +
> +int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel,
> +		     const u8 *data, int len);
> +
> +int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel,
> +			 const u8 *data, int len);
> +
> +int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd,
> +		    u8 *buf, int buflen);
> +
> +int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel,
> +			u8 *reqdata, int reqlen, u8 *buf, int buflen);
> +
> +int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd);
> +
> +/* XXX: questionable write helpers */
> +static inline int dsi_vc_dcs_write_0(struct intel_dsi *intel_dsi,
> +				     int channel, u8 dcs_cmd)
> +{
> +	return dsi_vc_dcs_write(intel_dsi, channel, &dcs_cmd, 1);
> +}
> +
> +static inline int dsi_vc_dcs_write_1(struct intel_dsi *intel_dsi,
> +				     int channel, u8 dcs_cmd, u8 param)
> +{
> +	u8 buf[2] = { dcs_cmd, param };
> +	return dsi_vc_dcs_write(intel_dsi, channel, buf, 2);
> +}
> +
> +static inline int dsi_vc_generic_write_0(struct intel_dsi *intel_dsi,
> +					 int channel)
> +{
> +	return dsi_vc_generic_write(intel_dsi, channel, NULL, 0);
> +}
> +
> +static inline int dsi_vc_generic_write_1(struct intel_dsi *intel_dsi,
> +					 int channel, u8 param)
> +{
> +	return dsi_vc_generic_write(intel_dsi, channel, &param, 1);
> +}
> +
> +static inline int dsi_vc_generic_write_2(struct intel_dsi *intel_dsi,
> +					 int channel, u8 param1, u8 param2)
> +{
> +	u8 buf[2] = { param1, param2 };
> +	return dsi_vc_generic_write(intel_dsi, channel, buf, 2);
> +}
> +
> +/* XXX: questionable read helpers */
> +static inline int dsi_vc_generic_read_0(struct intel_dsi *intel_dsi,
> +					int channel, u8 *buf, int buflen)
> +{
> +	return dsi_vc_generic_read(intel_dsi, channel, NULL, 0, buf, buflen);
> +}
> +
> +static inline int dsi_vc_generic_read_1(struct intel_dsi *intel_dsi,
> +					int channel, u8 param, u8 *buf,
> +					int buflen)
> +{
> +	return dsi_vc_generic_read(intel_dsi, channel, &param, 1, buf, buflen);
> +}
> +
> +static inline int dsi_vc_generic_read_2(struct intel_dsi *intel_dsi,
> +					int channel, u8 param1, u8 param2,
> +					u8 *buf, int buflen)
> +{
> +	u8 req[2] = { param1, param2 };
> +
> +	return dsi_vc_generic_read(intel_dsi, channel, req, 2, buf, buflen);
> +}
> +
> +
> +#endif /* _INTEL_DSI_DSI_H */
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC

Re: [PATCH v2 08/15] drm/i915: add basic MIPI DSI output support

[Ville Syrjälä]

On Fri, Aug 16, 2013 at 03:35:56PM +0300, Jani Nikula wrote:
> This does not include any panel specific sub-encoders yet.
> 
> v2: Fix fixed mode handling (Daniel)
> 
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile    |    1 +
>  drivers/gpu/drm/i915/intel_drv.h |    1 +
>  drivers/gpu/drm/i915/intel_dsi.c |  534 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 536 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/intel_dsi.c
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 8bffd29..5864c5b 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -21,6 +21,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
>  	  intel_display.o \
>  	  intel_crt.o \
>  	  intel_lvds.o \
> +	  intel_dsi.o \
>  	  intel_dsi_cmd.o \
>  	  intel_bios.o \
>  	  intel_ddi.o \
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index a31abc6..cbe3df1 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -525,6 +525,7 @@ extern void intel_mark_fb_busy(struct drm_i915_gem_object *obj,
>  			       struct intel_ring_buffer *ring);
>  extern void intel_mark_idle(struct drm_device *dev);
>  extern void intel_lvds_init(struct drm_device *dev);
> +extern bool intel_dsi_init(struct drm_device *dev);
>  extern bool intel_is_dual_link_lvds(struct drm_device *dev);
>  extern void intel_dp_init(struct drm_device *dev, int output_reg,
>  			  enum port port);
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> new file mode 100644
> index 0000000..d7eddbd
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -0,0 +1,534 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Author: Jani Nikula <jani.nikula@intel.com>
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_edid.h>
> +#include <drm/i915_drm.h>
> +#include <linux/slab.h>
> +#include "i915_drv.h"
> +#include "intel_drv.h"
> +#include "intel_dsi.h"
> +#include "intel_dsi_cmd.h"
> +
> +/* the sub-encoders aka panel drivers */
> +static const struct intel_dsi_device intel_dsi_devices[] = {
> +};
> +
> +static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)
> +{
> +	return container_of(intel_attached_encoder(connector),
> +			    struct intel_dsi, base);
> +}
> +
> +static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
> +{
> +	return intel_dsi->dev.type == INTEL_DSI_VIDEO_MODE;
> +}
> +
> +static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
> +{
> +	return intel_dsi->dev.type == INTEL_DSI_COMMAND_MODE;
> +}
> +
> +static void intel_dsi_hot_plug(struct intel_encoder *encoder)
> +{
> +	DRM_DEBUG_KMS("\n");
> +}
> +
> +static bool intel_dsi_compute_config(struct intel_encoder *encoder,
> +				     struct intel_crtc_config *config)
> +{
> +	struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
> +						   base);
> +	struct intel_connector *intel_connector = intel_dsi->attached_connector;
> +	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
> +	struct drm_display_mode *adjusted_mode = &config->adjusted_mode;
> +	struct drm_display_mode *mode = &config->requested_mode;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	if (fixed_mode)
> +		intel_fixed_panel_mode(fixed_mode, adjusted_mode);
> +
> +	if (intel_dsi->dev.dev_ops->mode_fixup)
> +		return intel_dsi->dev.dev_ops->mode_fixup(&intel_dsi->dev,
> +							  mode, adjusted_mode);
> +
> +	return true;
> +}
> +
> +static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)
> +{
> +	DRM_DEBUG_KMS("\n");
> +}
> +
> +static void intel_dsi_pre_enable(struct intel_encoder *encoder)
> +{
> +	DRM_DEBUG_KMS("\n");
> +}
> +
> +static void intel_dsi_enable(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> +	int pipe = intel_crtc->pipe;
> +	u32 temp;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	temp = I915_READ(MIPI_DEVICE_READY(pipe));
> +	temp &= ~ULPS_STATE_MASK;
> +	temp &= ~DEVICE_READY; /* XXX: assuming it's already !ready */

The spec seems to be telling me that we shouldn't frob w/ DEVICE_READY
when in ULPS.

So maybe we should not clear DEVICE_READY? Although it should not
be set when we get here, so I guess I'm worrying about nothing.

> +	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | ULPS_STATE_EXIT);
> +	msleep(20); /* XXX */
> +	I915_WRITE(MIPI_DEVICE_READY(pipe), temp);
> +	msleep(20); /* XXX */
> +	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | DEVICE_READY);
> +
> +	if (is_cmd_mode(intel_dsi))
> +		I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(pipe), 8 * 4);
> +
> +	/* Do this here, or let the slave encoder do it in ->dpms? */
> +	if (is_vid_mode(intel_dsi)) {
> +		dpi_send_cmd(intel_dsi, TURN_ON);
> +		msleep(100);
> +	}
> +
> +	/* assert ip_tg_enable signal */
> +	temp = I915_READ(MIPI_PORT_CTRL(pipe));
> +	I915_WRITE(MIPI_PORT_CTRL(pipe), temp | DPI_ENABLE);
> +	POSTING_READ(MIPI_PORT_CTRL(pipe));

Should be wrapped in is_vid_mode() check, no?

> +
> +	intel_dsi->dev.dev_ops->enable(&intel_dsi->dev);
> +}
> +
> +static void intel_dsi_disable(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> +	int pipe = intel_crtc->pipe;
> +	u32 temp;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	intel_dsi->dev.dev_ops->disable(&intel_dsi->dev);
> +
> +	if (is_vid_mode(intel_dsi))
> +		dpi_send_cmd(intel_dsi, SHUTDOWN);
> +
> +	if (is_vid_mode(intel_dsi)) {
> +		/* de-assert ip_tg_enable signal */
> +		temp = I915_READ(MIPI_PORT_CTRL(pipe));
> +		I915_WRITE(MIPI_PORT_CTRL(pipe), temp & ~DPI_ENABLE);
> +		POSTING_READ(MIPI_PORT_CTRL(pipe));
> +	}
> +
> +	/* XXX: wait for fifos before ulps entry */
> +
> +	temp = I915_READ(MIPI_DEVICE_READY(pipe));
> +	temp &= ~ULPS_STATE_MASK;

Here too I suppose we might do this ULPS state clearing after we've
cleared DEVICE_READY. But again the device should not be in ULPS here,
so it may be a bit pointless.

> +	temp &= ~DEVICE_READY;
> +	I915_WRITE(MIPI_DEVICE_READY(pipe), temp);
> +	msleep(5);
> +	I915_WRITE(MIPI_DEVICE_READY(pipe), temp | ULPS_STATE_ENTER);
> +}
> +
> +static void intel_dsi_post_disable(struct intel_encoder *encoder)
> +{
> +	DRM_DEBUG_KMS("\n");
> +}
> +
> +static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
> +				   enum pipe *pipe)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	/* XXX: this is wrong */
> +	if (intel_crtc) {
> +		u32 val;
> +
> +		*pipe = intel_crtc->pipe;
> +
> +		/* XXX: only works for video mode */
> +		val = I915_READ(MIPI_PORT_CTRL(*pipe));
> +		return val & DPI_ENABLE;
> +	}
> +
> +	/* XXX: do we also need to call
> +	 * intel_dsi->dev.dev_ops->get_hw_state(&intel_dsi->dev);
> +	 */
> +
> +	return false;
> +}
> +
> +static void intel_dsi_get_config(struct intel_encoder *encoder,
> +				 struct intel_crtc_config *pipe_config)
> +{
> +	DRM_DEBUG_KMS("\n");
> +
> +	/* XXX: read flags, set to adjusted_mode */
> +}
> +
> +static int intel_dsi_mode_valid(struct drm_connector *connector,
> +				struct drm_display_mode *mode)
> +{
> +	struct intel_connector *intel_connector = to_intel_connector(connector);
> +	struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
> +	struct intel_dsi *intel_dsi = intel_attached_dsi(connector);
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
> +		DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
> +		return MODE_NO_DBLESCAN;
> +	}
> +
> +	if (fixed_mode) {
> +		if (mode->hdisplay > fixed_mode->hdisplay)
> +			return MODE_PANEL;
> +		if (mode->vdisplay > fixed_mode->vdisplay)
> +			return MODE_PANEL;
> +	}
> +
> +	return intel_dsi->dev.dev_ops->mode_valid(&intel_dsi->dev, mode);
> +}
> +
> +/* return pixels in terms of txbyteclkhs */
> +static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count)
> +{
> +	return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp, 8), lane_count);
> +}
> +
> +static void set_dsi_timings(struct drm_encoder *encoder,
> +			    const struct drm_display_mode *mode)
> +{
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
> +	int pipe = intel_crtc->pipe;
> +	unsigned int bpp = intel_crtc->config.pipe_bpp;
> +	unsigned int lane_count = intel_dsi->lane_count;
> +
> +	u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
> +
> +	hactive = mode->hdisplay;
> +	hfp = mode->hsync_start - mode->hdisplay;
> +	hsync = mode->hsync_end - mode->hsync_start;
> +	hbp = mode->htotal - mode->hsync_end;
> +
> +	vfp = mode->vsync_start - mode->vdisplay;
> +	vsync = mode->vsync_end - mode->vsync_start;
> +	vbp = mode->vtotal - mode->vsync_end;
> +
> +	/* horizontal values are in terms of high speed byte clock */
> +	hactive = txbyteclkhs(hactive, bpp, lane_count);
> +	hfp = txbyteclkhs(hfp, bpp, lane_count);
> +	hsync = txbyteclkhs(hsync, bpp, lane_count);
> +	hbp = txbyteclkhs(hbp, bpp, lane_count);
> +
> +	I915_WRITE(MIPI_HACTIVE_AREA_COUNT(pipe), hactive);
> +	I915_WRITE(MIPI_HFP_COUNT(pipe), hfp);
> +
> +	/* meaningful for video mode non-burst sync pulse mode only, can be zero
> +	 * for non-burst sync events and burst modes */
> +	I915_WRITE(MIPI_HSYNC_PADDING_COUNT(pipe), hsync);
> +	I915_WRITE(MIPI_HBP_COUNT(pipe), hbp);
> +
> +	/* vertical values are in terms of lines */
> +	I915_WRITE(MIPI_VFP_COUNT(pipe), vfp);
> +	I915_WRITE(MIPI_VSYNC_PADDING_COUNT(pipe), vsync);
> +	I915_WRITE(MIPI_VBP_COUNT(pipe), vbp);
> +}
> +
> +static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
> +{
> +	struct drm_encoder *encoder = &intel_encoder->base;
> +	struct drm_device *dev = encoder->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
> +	struct drm_display_mode *adjusted_mode =
> +		&intel_crtc->config.adjusted_mode;
> +	int pipe = intel_crtc->pipe;
> +	unsigned int bpp = intel_crtc->config.pipe_bpp;
> +	u32 val, tmp;
> +
> +	DRM_DEBUG_KMS("pipe %d\n", pipe);
> +
> +	/* escape clock divider, 20MHz, shared for A and C. device ready must be
> +	 * off when doing this! txclkesc? */
> +	tmp = I915_READ(MIPI_CTRL(0));
> +	tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
> +	I915_WRITE(MIPI_CTRL(0), tmp | ESCAPE_CLOCK_DIVIDER_1);
> +
> +	/* read request priority is per pipe */
> +	tmp = I915_READ(MIPI_CTRL(pipe));
> +	tmp &= ~READ_REQUEST_PRIORITY_MASK;
> +	I915_WRITE(MIPI_CTRL(pipe), tmp | READ_REQUEST_PRIORITY_HIGH);
> +
> +	/* XXX: why here, why like this? handling in irq handler?! */
> +	I915_WRITE(MIPI_INTR_STAT(pipe), 0xffffffff);
> +	I915_WRITE(MIPI_INTR_EN(pipe), 0xffffffff);
> +
> +	I915_WRITE(MIPI_DPHY_PARAM(pipe),
> +		   0x3c << EXIT_ZERO_COUNT_SHIFT |
> +		   0x1f << TRAIL_COUNT_SHIFT |
> +		   0xc5 << CLK_ZERO_COUNT_SHIFT |
> +		   0x1f << PREPARE_COUNT_SHIFT);
> +
> +	I915_WRITE(MIPI_DPI_RESOLUTION(pipe),
> +		   adjusted_mode->vdisplay << VERTICAL_ADDRESS_SHIFT |
> +		   adjusted_mode->hdisplay << HORIZONTAL_ADDRESS_SHIFT);
> +
> +	set_dsi_timings(encoder, adjusted_mode);
> +
> +	val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
> +	if (is_cmd_mode(intel_dsi)) {
> +		val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
> +		val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
> +	} else {
> +		val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
> +
> +		/* XXX: cross-check bpp vs. pixel format? */
> +		val |= intel_dsi->pixel_format;
> +	}
> +	I915_WRITE(MIPI_DSI_FUNC_PRG(pipe), val);
> +
> +	/* timeouts for recovery. one frame IIUC. if counter expires, EOT and
> +	 * stop state. */
> +
> +	if (is_vid_mode(intel_dsi) &&
> +	    intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
> +		I915_WRITE(MIPI_HS_TX_TIMEOUT(pipe),
> +			   txbyteclkhs(adjusted_mode->htotal + 1, bpp,
> +				       intel_dsi->lane_count));

Should the +1 maybe be outside the txbyteclkhs()?

> +	} else {
> +		I915_WRITE(MIPI_HS_TX_TIMEOUT(pipe),
> +			   txbyteclkhs(adjusted_mode->vtotal *
> +				       adjusted_mode->htotal,
> +				       bpp, intel_dsi->lane_count));

+1 needed here too isn't it?

> +	}
> +	I915_WRITE(MIPI_LP_RX_TIMEOUT(pipe), 0xffff);

Hmm. Spec says this should be somewhere between 21 and
117+max_payload_bytes*16. If we take max_payload_bytes to be 512 based
on the generic data FIFO size, then we'd get 8309 as the absolute max
we will ever need.

> +	I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(pipe), 0x14);
> +
> +	I915_WRITE(MIPI_DEVICE_RESET_TIMER(pipe), 0xffff);

These two are the max according to the spec. Seems OK.

> +
> +	/* dphy stuff */
> +
> +	/* in terms of low power clock */
> +	I915_WRITE(MIPI_INIT_COUNT(pipe), 0x7d0);

Maybe add a note that the actual initialization period is 100 usec, so
people don't have to reverse compute it. Or maybe even add some
txclkesc variable/define and explicitly calculate this.

Maybe it would be clearer to write these timeout values in decimal,
though the spec seems to prefer hex in some cases.

> +
> +	/* recovery disables */
> +	I915_WRITE(MIPI_EOT_DISABLE(pipe), intel_dsi->eot_disable);
> +
> +	/* in terms of txbyteclkhs. actual high to low switch +
> +	 * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
> +	 *
> +	 * XXX: write MIPI_STOP_STATE_STALL?
> +	 */
> +	I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(pipe), 0x46);
> +
> +	/* XXX: low power clock equivalence in terms of byte clock. the number
> +	 * of byte clocks occupied in one low power clock. based on txbyteclkhs
> +	 * and txclkesc. txclkesc time / txbyteclk time * (105 +
> +	 * MIPI_STOP_STATE_STALL) / 105.???
> +	 */
> +	I915_WRITE(MIPI_LP_BYTECLK(pipe), 4);
> +
> +	/* the bw essential for transmitting 16 long packets containing 252
> +	 * bytes meant for dcs write memory command is programmed in this
> +	 * register in terms of byte clocks. based on dsi transfer rate and the
> +	 * number of lanes configured the time taken to transmit 16 long packets
> +	 * in a dsi stream varies. */
> +	I915_WRITE(MIPI_DBI_BW_CTRL(pipe), 0x820);
> +
> +	I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(pipe),
> +		   0xa << LP_HS_SSW_CNT_SHIFT |
> +		   0x14 << HS_LP_PWR_SW_CNT_SHIFT);

Hmm. Actualky calculating all this stuff might be nice. But I guess we
can leave that for later.

> +
> +	if (is_vid_mode(intel_dsi))
> +		I915_WRITE(MIPI_VIDEO_MODE_FORMAT(pipe),
> +			   intel_dsi->video_mode_format);
> +}
> +
> +static enum drm_connector_status
> +intel_dsi_detect(struct drm_connector *connector, bool force)
> +{
> +	struct intel_dsi *intel_dsi = intel_attached_dsi(connector);
> +	DRM_DEBUG_KMS("\n");
> +	return intel_dsi->dev.dev_ops->detect(&intel_dsi->dev);
> +}
> +
> +static int intel_dsi_get_modes(struct drm_connector *connector)
> +{
> +	struct intel_connector *intel_connector = to_intel_connector(connector);
> +	struct drm_display_mode *mode;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	if (!intel_connector->panel.fixed_mode) {
> +		DRM_DEBUG_KMS("no fixed mode\n");
> +		return 0;
> +	}
> +
> +	mode = drm_mode_duplicate(connector->dev,
> +				  intel_connector->panel.fixed_mode);
> +	if (!mode) {
> +		DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
> +		return 0;
> +	}
> +
> +	drm_mode_probed_add(connector, mode);
> +	return 1;
> +}
> +
> +static void intel_dsi_destroy(struct drm_connector *connector)
> +{
> +	struct intel_connector *intel_connector = to_intel_connector(connector);
> +
> +	DRM_DEBUG_KMS("\n");
> +	intel_panel_fini(&intel_connector->panel);
> +	drm_sysfs_connector_remove(connector);
> +	drm_connector_cleanup(connector);
> +	kfree(connector);
> +}
> +
> +static const struct drm_encoder_funcs intel_dsi_funcs = {
> +	.destroy = intel_encoder_destroy,
> +};
> +
> +static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
> +	.get_modes = intel_dsi_get_modes,
> +	.mode_valid = intel_dsi_mode_valid,
> +	.best_encoder = intel_best_encoder,
> +};
> +
> +static const struct drm_connector_funcs intel_dsi_connector_funcs = {
> +	.dpms = intel_connector_dpms,
> +	.detect = intel_dsi_detect,
> +	.destroy = intel_dsi_destroy,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +};
> +
> +bool intel_dsi_init(struct drm_device *dev)
> +{
> +	struct intel_dsi *intel_dsi;
> +	struct intel_encoder *intel_encoder;
> +	struct drm_encoder *encoder;
> +	struct intel_connector *intel_connector;
> +	struct drm_connector *connector;
> +	struct drm_display_mode *fixed_mode = NULL;
> +	const struct intel_dsi_device *dsi;
> +	unsigned int i;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
> +	if (!intel_dsi)
> +		return false;
> +
> +	intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
> +	if (!intel_connector) {
> +		kfree(intel_dsi);
> +		return false;
> +	}
> +
> +	intel_encoder = &intel_dsi->base;
> +	encoder = &intel_encoder->base;
> +	intel_dsi->attached_connector = intel_connector;
> +
> +	connector = &intel_connector->base;
> +
> +	drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI);
> +
> +	/* XXX: very likely not all of these are needed */
> +	intel_encoder->hot_plug = intel_dsi_hot_plug;
> +	intel_encoder->compute_config = intel_dsi_compute_config;
> +	intel_encoder->pre_pll_enable = intel_dsi_pre_pll_enable;
> +	intel_encoder->pre_enable = intel_dsi_pre_enable;
> +	intel_encoder->enable = intel_dsi_enable;
> +	intel_encoder->mode_set = intel_dsi_mode_set;
> +	intel_encoder->disable = intel_dsi_disable;
> +	intel_encoder->post_disable = intel_dsi_post_disable;
> +	intel_encoder->get_hw_state = intel_dsi_get_hw_state;
> +	intel_encoder->get_config = intel_dsi_get_config;
> +
> +	intel_connector->get_hw_state = intel_connector_get_hw_state;
> +
> +	for (i = 0; i < ARRAY_SIZE(intel_dsi_devices); i++) {
> +		dsi = &intel_dsi_devices[i];
> +		intel_dsi->dev = *dsi;
> +
> +		if (dsi->dev_ops->init(&intel_dsi->dev))
> +			break;
> +	}
> +
> +	if (i == ARRAY_SIZE(intel_dsi_devices)) {
> +		DRM_DEBUG_KMS("no device found\n");
> +		goto err;
> +	}
> +
> +	intel_encoder->type = INTEL_OUTPUT_DSI;
> +	intel_encoder->crtc_mask = (1 << 0); /* XXX */

Maybe just pass in "pipe" since we have DSI for both A and B. Although
I didn't look at the DSI PLL code yet, so I'm not sure we can actually
use both DSI outputs at the same time currently. I suppose both need
to be running at the same freq since we have only one PLL, and we have
to take care of the PLL sharing somewhere.

> +
> +	intel_encoder->cloneable = false;
> +	drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
> +			   DRM_MODE_CONNECTOR_DSI);
> +
> +	drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
> +
> +	connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
> +	connector->interlace_allowed = false;
> +	connector->doublescan_allowed = false;
> +
> +	intel_connector_attach_encoder(intel_connector, intel_encoder);
> +
> +	drm_sysfs_connector_add(connector);
> +
> +	fixed_mode = dsi->dev_ops->get_modes(&intel_dsi->dev);
> +	if (!fixed_mode) {
> +		DRM_DEBUG_KMS("no fixed mode\n");
> +		goto err;
> +	}
> +
> +	fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
> +	intel_panel_init(&intel_connector->panel, fixed_mode);
> +
> +	return true;
> +
> +err:
> +	drm_encoder_cleanup(&intel_encoder->base);
> +	kfree(intel_dsi);
> +	kfree(intel_connector);
> +
> +	return false;
> +}
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC

Re: [PATCH v2 09/15] drm/i915: add VLV DSI PLL Calculations

[Ville Syrjälä]

On Fri, Aug 16, 2013 at 03:35:57PM +0300, Jani Nikula wrote:
> From: ymohanma <yogesh.mohan.marimuthu@intel.com>
> 
> v2:
>  - Grab dpio_lock mutex in vlv_enable_dsi_pll().
>  - Add and call vlv_disable_dsi_pll().
> 
> Signed-off-by: ymohanma <yogesh.mohan.marimuthu@intel.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/Makefile        |    1 +
>  drivers/gpu/drm/i915/i915_reg.h      |   10 ++
>  drivers/gpu/drm/i915/intel_dsi.c     |    7 +
>  drivers/gpu/drm/i915/intel_dsi.h     |    3 +
>  drivers/gpu/drm/i915/intel_dsi_pll.c |  310 ++++++++++++++++++++++++++++++++++
>  5 files changed, 331 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/intel_dsi_pll.c
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 5864c5b..65e60d2 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -23,6 +23,7 @@ i915-y := i915_drv.o i915_dma.o i915_irq.o \
>  	  intel_lvds.o \
>  	  intel_dsi.o \
>  	  intel_dsi_cmd.o \
> +	  intel_dsi_pll.o \
>  	  intel_bios.o \
>  	  intel_ddi.o \
>  	  intel_dp.o \
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 9879619..5feed04 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -390,6 +390,16 @@
>  #define   FB_FMAX_VMIN_FREQ_LO_SHIFT		27
>  #define   FB_FMAX_VMIN_FREQ_LO_MASK		0xf8000000
>  
> +/* vlv2 north clock has */
> +#define CCK_REG_DSI_PLL_FUSE			0x44
> +#define CCK_REG_DSI_PLL_CONTROL			0x48
> +#define  DSI_PLL_VCO_EN				(1 << 31)
> +#define  DSI_PLL_LDO_GATE			(1 << 30)
> +#define  DSI_PLL_P1_POST_DIV_SHIFT		17
> +#define  DSI_PLL_P1_POST_DIV_MASK		(0x1ff << 17)

All the clock gate/mux bits missing here. Maybe add names for them as
well.

> +#define  DSI_PLL_LOCK				(1 << 0)
> +#define CCK_REG_DSI_PLL_DIVIDER			0x4c

And maybe add the names for the bits here too.

> +
>  /*
>   * DPIO - a special bus for various display related registers to hide behind
>   *
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index d7eddbd..352ff46 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -83,6 +83,8 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
>  static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)
>  {
>  	DRM_DEBUG_KMS("\n");
> +
> +	vlv_enable_dsi_pll(encoder);
>  }
>  
>  static void intel_dsi_pre_enable(struct intel_encoder *encoder)
> @@ -161,6 +163,8 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
>  static void intel_dsi_post_disable(struct intel_encoder *encoder)
>  {
>  	DRM_DEBUG_KMS("\n");
> +
> +	vlv_disable_dsi_pll(encoder);
>  }
>  
>  static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
> @@ -284,6 +288,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
>  
>  	DRM_DEBUG_KMS("pipe %d\n", pipe);
>  
> +	/* Update the DSI PLL */
> +	vlv_enable_dsi_pll(intel_encoder);
> +
>  	/* escape clock divider, 20MHz, shared for A and C. device ready must be
>  	 * off when doing this! txclkesc? */
>  	tmp = I915_READ(MIPI_CTRL(0));
> diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
> index f308269..c7765f3 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.h
> +++ b/drivers/gpu/drm/i915/intel_dsi.h
> @@ -96,4 +96,7 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
>  	return container_of(encoder, struct intel_dsi, base.base);
>  }
>  
> +extern void vlv_enable_dsi_pll(struct intel_encoder *encoder);
> +extern void vlv_disable_dsi_pll(struct intel_encoder *encoder);
> +
>  #endif /* _INTEL_DSI_H */
> diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
> new file mode 100644
> index 0000000..c50a90e
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
> @@ -0,0 +1,310 @@
> +/*
> + * Copyright © 2013 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Authors:
> + *	Shobhit Kumar <shobhit.kumar@intel.com>
> + *	Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include "intel_drv.h"
> +#include "i915_drv.h"
> +#include "intel_dsi.h"
> +
> +#define DSI_HSS_PACKET_SIZE		4
> +#define DSI_HSE_PACKET_SIZE		4
> +#define DSI_HSA_PACKET_EXTRA_SIZE	6
> +#define DSI_HBP_PACKET_EXTRA_SIZE	6
> +#define DSI_HACTIVE_PACKET_EXTRA_SIZE	6
> +#define DSI_HFP_PACKET_EXTRA_SIZE	6
> +#define DSI_EOTP_PACKET_SIZE		4
> +
> +struct dsi_clock_table {
> +	u32 freq;
> +	u8 m;
> +	u8 p;
> +};
> +
> +struct dsi_mnp {
> +	u32 dsi_pll_ctrl;
> +	u32 dsi_pll_div;
> +};
> +
> +static u32 lfsr_converts[] = {

+const

> +	426, 469, 234, 373, 442, 221, 110, 311, 411,		/* 62 - 70 */
> +	461, 486, 243, 377, 188, 350, 175, 343, 427, 213,	/* 71 - 80 */
> +	106, 53, 282, 397, 354, 227, 113, 56, 284, 142,		/* 81 - 90 */
> +	71, 35							/* 91 - 92 */
> +};

Can't find this table in my specs. Presumably it's correct if the code
manages to generate the correct clocks.

> +
> +struct dsi_clock_table dsi_clk_tbl[] = {

+static const 

> +	{300, 72, 6}, {313, 75, 6}, {323, 78, 6}, {333, 80, 6},
> +	{343, 82, 6}, {353, 85, 6}, {363, 87, 6}, {373, 90, 6},
> +	{383, 92, 6}, {390, 78, 5}, {393, 79, 5}, {400, 80, 5},
> +	{401, 80, 5}, {402, 80, 5}, {403, 81, 5}, {404, 81, 5},
> +	{405, 81, 5}, {406, 81, 5}, {407, 81, 5}, {408, 82, 5},
> +	{409, 82, 5}, {410, 82, 5}, {411, 82, 5}, {412, 82, 5},
> +	{413, 83, 5}, {414, 83, 5}, {415, 83, 5}, {416, 83, 5},
> +	{417, 83, 5}, {418, 84, 5}, {419, 84, 5}, {420, 84, 5},
> +	{430, 86, 5}, {440, 88, 5}, {450, 90, 5}, {460, 92, 5},
> +	{470, 75, 4}, {480, 77, 4}, {490, 78, 4}, {500, 80, 4},
> +	{510, 82, 4}, {520, 83, 4}, {530, 85, 4}, {540, 86, 4},
> +	{550, 88, 4}, {560, 90, 4}, {570, 91, 4}, {580, 70, 3},
> +	{590, 71, 3}, {600, 72, 3}, {610, 73, 3}, {620, 74, 3},
> +	{630, 76, 3}, {640, 77, 3}, {650, 78, 3}, {660, 79, 3},
> +	{670, 80, 3}, {680, 82, 3}, {690, 83, 3}, {700, 84, 3},
> +	{710, 85, 3}, {720, 86, 3}, {730, 88, 3}, {740, 89, 3},
> +	{750, 90, 3}, {760, 91, 3}, {770, 92, 3}, {780, 62, 2},
> +	{790, 63, 2}, {800, 64, 2}, {880, 70, 2}, {900, 72, 2},
> +	{1000, 80, 2},		/* dsi clock frequency in Mhz*/
> +};
> +
> +static u32 dsi_rr_formula(struct drm_display_mode *mode,
> +			  int pixel_format, int video_mode_format,
> +			  int lane_count, bool eotp)
> +{
> +	u32 bpp;
> +	u32 hactive, vactive, hfp, hsync, hbp, vfp, vsync, vbp;
> +	u32 hsync_bytes, hbp_bytes, hactive_bytes, hfp_bytes;
> +	u32 bytes_per_line, bytes_per_frame;
> +	u32 num_frames;
> +	u32 bytes_per_x_frames, bytes_per_x_frames_x_lanes;
> +	u32 dsi_bit_clock_hz;
> +	u32 dsi_clk;
> +
> +	switch (pixel_format) {
> +	default:
> +	case VID_MODE_FORMAT_RGB888:
> +	case VID_MODE_FORMAT_RGB666_LOOSE:
> +		bpp = 24;
> +		break;
> +	case VID_MODE_FORMAT_RGB666:
> +		bpp = 18;
> +		break;
> +	case VID_MODE_FORMAT_RGB565:
> +		bpp = 16;
> +		break;
> +	}
> +
> +	hactive = mode->hdisplay;
> +	vactive = mode->vdisplay;
> +	hfp = mode->hsync_start - mode->hdisplay;
> +	hsync = mode->hsync_end - mode->hsync_start;
> +	hbp = mode->htotal - mode->hsync_end;
> +
> +	vfp = mode->vsync_start - mode->vdisplay;
> +	vsync = mode->vsync_end - mode->vsync_start;
> +	vbp = mode->vtotal - mode->vsync_end;
> +
> +	hsync_bytes = DIV_ROUND_UP(hsync * bpp, 8);
> +	hbp_bytes = DIV_ROUND_UP(hbp * bpp, 8);
> +	hactive_bytes = DIV_ROUND_UP(hactive * bpp, 8);
> +	hfp_bytes = DIV_ROUND_UP(hfp * bpp, 8);
> +
> +	bytes_per_line = DSI_HSS_PACKET_SIZE + hsync_bytes +
> +		DSI_HSA_PACKET_EXTRA_SIZE + DSI_HSE_PACKET_SIZE +
> +		hbp_bytes + DSI_HBP_PACKET_EXTRA_SIZE +
> +		hactive_bytes + DSI_HACTIVE_PACKET_EXTRA_SIZE +
> +		hfp_bytes + DSI_HFP_PACKET_EXTRA_SIZE;
> +
> +	/*
> +	 * XXX: Need to accurately calculate LP to HS transition timeout and add
> +	 * it to bytes_per_line/bytes_per_frame.
> +	 */
> +
> +	if (eotp && video_mode_format == VIDEO_MODE_BURST)
> +		bytes_per_line += DSI_EOTP_PACKET_SIZE;
> +
> +	bytes_per_frame = vsync * bytes_per_line + vbp * bytes_per_line +
> +		vactive * bytes_per_line + vfp * bytes_per_line;
> +
> +	if (eotp &&
> +	    (video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE ||
> +	     video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS))
> +		bytes_per_frame += DSI_EOTP_PACKET_SIZE;
> +
> +	num_frames = (mode->clock * 1000) / (mode->htotal * mode->vtotal);

drm_mode_vrefresh() perhaps. That would round to nearest instead of down.

> +	bytes_per_x_frames = num_frames * bytes_per_frame;
> +
> +	bytes_per_x_frames_x_lanes = bytes_per_x_frames / lane_count;
> +
> +	/* the dsi clock is divided by 2 in the hardware to get dsi ddr clock */
> +	dsi_bit_clock_hz = bytes_per_x_frames_x_lanes * 8;
> +	dsi_clk = dsi_bit_clock_hz / (1000 * 1000);

We want it in kHz for the PLL calculations, so we lose a bit of precision
when we clearly don't need to.

> +
> +	if (eotp && video_mode_format == VIDEO_MODE_BURST)
> +		dsi_clk *= 2;

I wonder what's the magic here? Why does the generation of EoT packets
in burst mode warrant doubled clock? We already added the actual
overhead from the EoT packets before.

> +
> +	return dsi_clk;
> +}
> +
> +static int mnp_from_clk_table(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
> +{
> +	unsigned int i;
> +	u8 m;
> +	u8 n;
> +	u8 p;
> +	u32 m_seed;
> +
> +	if (dsi_clk < 300 || dsi_clk > 1000)
> +		return -ECHRNG;
> +
> +	for (i = 0; i <= ARRAY_SIZE(dsi_clk_tbl); i++) {
> +		if (dsi_clk_tbl[i].freq > dsi_clk)
> +			break;
> +	}
> +
> +	m = dsi_clk_tbl[i].m;
> +	p = dsi_clk_tbl[i].p;
> +	m_seed = lfsr_converts[m - 62];
> +	n = 1;
> +	dsi_mnp->dsi_pll_ctrl = (1 << (17 + p - 2)) | (1 << 8);

The clock gating stuff is hardcoded here. I'd probably move it out from
this function so that we can play with the PLL bypass/second DSI output
a bit easier at some point. A FIXME might be nice to let people know
we still have things to implement there.

> +	dsi_mnp->dsi_pll_div = ((n - 1) << 16) | m_seed;
> +
> +	return 0;
> +}
> +
> +static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
> +{
> +	u32 m, n, p;
> +	u32 ref_clk;
> +	u32 error;
> +	u32 tmp_error;
> +	u32 target_dsi_clk;
> +	u32 calc_dsi_clk;
> +	u32 calc_m;
> +	u32 calc_p;
> +	u32 m_seed;
> +
> +	if (dsi_clk < 300 || dsi_clk > 1150) {

Hmm. North clock HAS says the range is 100-1000, display cluster HAS
says 300-1000. Can't see 1150 in any of my docs.

> +		DRM_ERROR("DSI CLK Out of Range\n");
> +		return -ECHRNG;
> +	}
> +
> +	ref_clk = 25000;
> +	target_dsi_clk = dsi_clk * 1000;
> +	error = 0xFFFFFFFF;
> +	tmp_error = 0xFFFFFFFF;

No need to init tmp_error.

> +	calc_m = 0;
> +	calc_p = 0;
> +
> +	for (m = 62; m <= 92; m++) {
> +		for (p = 2; p <= 6; p++) {

Hmm. Full range for P1 is 2-10 accoring to north clock HAS.
Display cluster HAS has the 2-6 range.

> +
> +			calc_dsi_clk = (m * ref_clk) / p;

We're not actually checking that VCO freq is within limits.
Again north clock HAS says 100-1000 is also the VCO limit
(sounds fishy), display cluster HAS says 1550-2300.

1150 is 2300/2, so maybe that's where the 1150 came from. Not
sure how the 6 came about. 300*7 < 2300 so letting P go up to
7 would still keep the VCO freq in range.

Oh well, I suppose it's all good enough.

> +			if (calc_dsi_clk >= target_dsi_clk) {
> +				tmp_error = calc_dsi_clk - target_dsi_clk;
> +				if (tmp_error < error) {
> +					error = tmp_error;
> +					calc_m = m;
> +					calc_p = p;
> +				}
> +			}

Could use 'continue' to avoid deep nesting.

> +		}
> +	}
> +
> +	m_seed = lfsr_converts[calc_m - 62];
> +	n = 1;

Matches display cluster HAS it seems.

> +	dsi_mnp->dsi_pll_ctrl = (1 << (17 + calc_p - 2)) | (1 << 8);

Hardcoded clock gating again.

> +	dsi_mnp->dsi_pll_div = ((n - 1) << 16) | m_seed;
> +
> +	return 0;
> +}
> +
> +static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
> +	struct drm_display_mode *mode = &intel_crtc->config.requested_mode;
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> +	int ret;
> +	struct dsi_mnp dsi_mnp;
> +	u32 dsi_clk;
> +
> +	dsi_clk = dsi_rr_formula(mode, intel_dsi->pixel_format,
> +				 intel_dsi->video_mode_format,
> +				 intel_dsi->lane_count, !intel_dsi->eot_disable);
> +
> +#if 0
> +	ret = mnp_from_clk_table(dsi_clk, &dsi_mnp);
> +#else
> +	ret = dsi_calc_mnp(dsi_clk, &dsi_mnp);
> +#endif
> +
> +	if (ret) {
> +		DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
> +		return;
> +	}
> +
> +	DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n",
> +		      dsi_mnp.dsi_pll_div, dsi_mnp.dsi_pll_ctrl);
> +
> +	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
> +	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, dsi_mnp.dsi_pll_div);
> +	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, dsi_mnp.dsi_pll_ctrl);
> +}
> +
> +void vlv_enable_dsi_pll(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
> +	int pipe = intel_crtc->pipe;
> +	u32 tmp;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	mutex_lock(&dev_priv->dpio_lock);
> +
> +	vlv_configure_dsi_pll(encoder);
> +
> +	/* wait 0.5us after ungating before enabling again */
> +	udelay(1 * 1000);

Says 0.5us and then spins for 1ms. Quite a large difference.

> +
> +	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
> +	tmp |= DSI_PLL_VCO_EN;
> +	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
> +
> +	mutex_unlock(&dev_priv->dpio_lock);
> +
> +	if (wait_for(I915_READ(PIPECONF(pipe)) & PIPECONF_DSI_PLL_LOCKED, 20)) {

Should be hardcoded PIPE_A here I think. Or we could use the lock bit
in CCK_REG_DSI_PLL_CONTROL, but PIPECONF should have less overhead and
we don't need to hold the dpio_lock.

> +		DRM_ERROR("DSI PLL lock failed\n");
> +		return;
> +	}
> +
> +	DRM_DEBUG_KMS("DSI PLL locked\n");
> +}
> +
> +void vlv_disable_dsi_pll(struct intel_encoder *encoder)
> +{
> +	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> +	u32 tmp;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	mutex_lock(&dev_priv->dpio_lock);
> +
> +	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
> +	tmp &= ~DSI_PLL_VCO_EN;

Also power gate the LDO?

> +	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
> +
> +	mutex_unlock(&dev_priv->dpio_lock);
> +}
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC

Re: [PATCH v2 12/15] drm/i915: Band Gap WA

[Ville Syrjälä]

On Fri, Aug 16, 2013 at 03:36:00PM +0300, Jani Nikula wrote:
> From: Shobhit Kumar <shobhit.kumar@intel.com>
> 
> Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
> Signed-off-by: ymohanma <yogesh.mohan.marimuthu@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dsi.c |   48 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 352ff46..676b310 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -37,6 +37,51 @@
>  static const struct intel_dsi_device intel_dsi_devices[] = {
>  };
>  
> +
> +static void vlv_cck_modify(struct drm_i915_private *dev_priv, u32 reg, u32 val,
> +			   u32 mask)
> +{
> +	u32 tmp = vlv_cck_read(dev_priv, reg);
> +	tmp &= ~mask;
> +	tmp |= val;
> +	vlv_cck_write(dev_priv, reg, tmp);
> +}
> +
> +static void band_gap_wa(struct drm_i915_private *dev_priv)
> +{
> +	mutex_lock(&dev_priv->dpio_lock);
> +
> +	/* Enable bandgap fix in GOP driver */
> +	vlv_cck_modify(dev_priv, 0x6D, 0x00010000, 0x00030000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x6E, 0x00010000, 0x00030000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x6F, 0x00010000, 0x00030000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x00, 0x00008000, 0x00008000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x00, 0x00000000, 0x00008000);
> +	msleep(20);
> +
> +	/* Turn Display Trunk on */

This single comment here looks a bit inconsistent. Why have it for this
one case and not the others. Maybe we should just give the bits proper
names so we don't need such silly comments.

> +	vlv_cck_modify(dev_priv, 0x6B, 0x00020000, 0x00030000);
> +	msleep(20);
> +
> +	vlv_cck_modify(dev_priv, 0x6C, 0x00020000, 0x00030000);
> +	msleep(20);
> +
> +	vlv_cck_modify(dev_priv, 0x6D, 0x00020000, 0x00030000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x6E, 0x00020000, 0x00030000);
> +	msleep(20);
> +	vlv_cck_modify(dev_priv, 0x6F, 0x00020000, 0x00030000);

I wonder if we really need to force all the trunks on, or would it be
enough to clear the force off bits and rely on the signals from Punit
to do the rest. I suppose we should at least clear the DSI trunk force
on bits when disabling DSI output.

Can't say anything intelligent about the workaround in general as I've
not seen it mentioned anywhere. Based on the spec this appears to just
force the DSI trunk clocks off, then toggle some DSI releated reset,
and then force the clocks back on (also the dp and dpref trunks, even
though it didn't actually force them off in the first place, which seems
a bit weird).

Also wondering about all these sleeps. Do we really need them at every
step, or could we just disable all the trunk clocks -> sleep -> reset on ->
sleep -> reset off -> sleep -> turn the trunks back on -> sleep some
more. That's almost 300ms were sleeping here, and that's not even including
the sideband overhead.

> +
> +	mutex_unlock(&dev_priv->dpio_lock);
> +
> +	/* Need huge delay, otherwise clock is not stable */
> +	msleep(100);
> +}
> +
>  static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector)
>  {
>  	return container_of(intel_attached_encoder(connector),
> @@ -291,6 +336,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder)
>  	/* Update the DSI PLL */
>  	vlv_enable_dsi_pll(intel_encoder);
>  
> +	/* XXX: Location of the call */
> +	band_gap_wa(dev_priv);
> +
>  	/* escape clock divider, 20MHz, shared for A and C. device ready must be
>  	 * off when doing this! txclkesc? */
>  	tmp = I915_READ(MIPI_CTRL(0));
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC