[PATCH 0/7] Rockchip dw-mipi-dsi driver

[PATCH 0/7] Rockchip dw-mipi-dsi driver

[Chris Zhong]

Hi all

This is a bunch of dw-mipi-dsi driver for RK3399 and RK3288, they have
been tested on rk3399 and rk3288 evb board.

This series is based on Mark Yao's branch:
https://github.com/markyzq/kernel-drm-rockchip/tree/drm-rockchip-next-2016-05-23



Chris Zhong (7):
  dt-bindings: add rk3399 support for dw-mipi-rockchip
  DRM: mipi: support rk3399 mipi dsi
  dt-bindings: add power domain node for dw-mipi-rockchip
  drm/rockchip: dw-mipi: add dw-mipi power domain support
  drm/rockchip: dw-mipi: support HPD poll
  drm/rockchip: dw-mipi: fix phy clk lane stop state timeout
  drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel

 .../display/rockchip/dw_mipi_dsi_rockchip.txt      |   6 +
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c             | 135 +++++++++++++++++----
 2 files changed, 120 insertions(+), 21 deletions(-)

-- 
2.6.3

[PATCH 1/7] dt-bindings: add rk3399 support for dw-mipi-rockchip

[Chris Zhong]

The dw-mipi-dsi of rk3399 is almost the same as rk3288, the rk3399 has
additional phy config clock.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

 .../devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
index 1753f0c..4d59df3 100644
--- a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
+++ b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
@@ -5,6 +5,7 @@ Required properties:
 - #address-cells: Should be <1>.
 - #size-cells: Should be <0>.
 - compatible: "rockchip,rk3288-mipi-dsi", "snps,dw-mipi-dsi".
+	      "rockchip,rk3399-mipi-dsi", "snps,dw-mipi-dsi".
 - reg: Represent the physical address range of the controller.
 - interrupts: Represent the controller's interrupt to the CPU(s).
 - clocks, clock-names: Phandles to the controller's pll reference
@@ -13,6 +14,10 @@ Required properties:
 - ports: contain a port node with endpoint definitions as defined in [2].
   For vopb,set the reg = <0> and set the reg = <1> for vopl.
 
+Optional properties:
+- clocks, clock-names: phandle to the dw-mipi phy clock, name should be
+		       "phy_cfg".
+
 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
 [2] Documentation/devicetree/bindings/media/video-interfaces.txt
 
-- 
2.6.3

[PATCH 1/7] dt-bindings: add rk3399 support for dw-mipi-rockchip

[Rob Herring]

On Fri, Jul 08, 2016 at 05:04:55PM +0800, Chris Zhong wrote:
> The dw-mipi-dsi of rk3399 is almost the same as rk3288, the rk3399 has
> additional phy config clock.
> 
> Signed-off-by: Chris Zhong <zyw@rock-chips.com>
> ---
> 
>  .../devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt    | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
> index 1753f0c..4d59df3 100644
> --- a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
> +++ b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
> @@ -5,6 +5,7 @@ Required properties:
>  - #address-cells: Should be <1>.
>  - #size-cells: Should be <0>.
>  - compatible: "rockchip,rk3288-mipi-dsi", "snps,dw-mipi-dsi".
> +	      "rockchip,rk3399-mipi-dsi", "snps,dw-mipi-dsi".
>  - reg: Represent the physical address range of the controller.
>  - interrupts: Represent the controller's interrupt to the CPU(s).
>  - clocks, clock-names: Phandles to the controller's pll reference
> @@ -13,6 +14,10 @@ Required properties:
>  - ports: contain a port node with endpoint definitions as defined in [2].
>    For vopb,set the reg = <0> and set the reg = <1> for vopl.
>  
> +Optional properties:
> +- clocks, clock-names: phandle to the dw-mipi phy clock, name should be
> +		       "phy_cfg".
> +

This is not really optional. It is required for rk3399. Document with 
the rest of the clocks and note this one is rk3399 only.

Rob

[PATCH 2/7] DRM: mipi: support rk3399 mipi dsi

[Chris Zhong]

The vopb/vopl switch register of rk3399 mipi is different from rk3288,
the default setting for mipi dsi mode is different too, so add a
of_device_id structure to distinguish them, and make sure set the
correct mode before mipi phy init.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 70 ++++++++++++++++++++++++++++------
 1 file changed, 59 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index dedc65b..100da01 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -28,9 +28,17 @@
 
 #define DRIVER_NAME    "dw-mipi-dsi"
 
-#define GRF_SOC_CON6                    0x025c
-#define DSI0_SEL_VOP_LIT                (1 << 6)
-#define DSI1_SEL_VOP_LIT                (1 << 9)
+#define RK3288_GRF_SOC_CON6		0x025c
+#define RK3288_DSI0_SEL_VOP_LIT		BIT(6)
+#define RK3288_DSI1_SEL_VOP_LIT		BIT(9)
+
+#define RK3399_GRF_SOC_CON19		0x6250
+#define RK3399_DSI0_SEL_VOP_LIT		BIT(0)
+#define RK3399_DSI1_SEL_VOP_LIT		BIT(4)
+
+/* disable turnrequest, turndisable, forcetxstopmode, forcerxmode */
+#define RK3399_GRF_SOC_CON22		0x6258
+#define RK3399_GRF_DSI_MODE		0xffff0000
 
 #define DSI_VERSION			0x00
 #define DSI_PWR_UP			0x04
@@ -147,7 +155,6 @@
 #define LPRX_TO_CNT(p)			((p) & 0xffff)
 
 #define DSI_BTA_TO_CNT			0x8c
-
 #define DSI_LPCLK_CTRL			0x94
 #define AUTO_CLKLANE_CTRL		BIT(1)
 #define PHY_TXREQUESTCLKHS		BIT(0)
@@ -263,6 +270,11 @@ enum {
 };
 
 struct dw_mipi_dsi_plat_data {
+	u32 dsi0_en_bit;
+	u32 dsi1_en_bit;
+	u32 grf_switch_reg;
+	u32 grf_dsi0_mode;
+	u32 grf_dsi0_mode_reg;
 	unsigned int max_data_lanes;
 	enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
 					   struct drm_display_mode *mode);
@@ -279,6 +291,7 @@ struct dw_mipi_dsi {
 
 	struct clk *pllref_clk;
 	struct clk *pclk;
+	struct clk *phy_cfg_clk;
 
 	unsigned int lane_mbps; /* per lane */
 	u32 channel;
@@ -400,6 +413,14 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 
 	dsi_write(dsi, DSI_PWR_UP, POWERUP);
 
+	if (!IS_ERR(dsi->phy_cfg_clk)) {
+		ret = clk_prepare_enable(dsi->phy_cfg_clk);
+		if (ret) {
+			dev_err(dsi->dev, "Failed to enable phy_cfg_clk\n");
+			return ret;
+		}
+	}
+
 	dw_mipi_dsi_phy_write(dsi, 0x10, BYPASS_VCO_RANGE |
 					 VCO_RANGE_CON_SEL(vco) |
 					 VCO_IN_CAP_CON_LOW |
@@ -444,17 +465,19 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 				 val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
 	if (ret < 0) {
 		dev_err(dsi->dev, "failed to wait for phy lock state\n");
-		return ret;
+		goto phy_init_end;
 	}
 
 	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
 				 val, val & STOP_STATE_CLK_LANE, 1000,
 				 PHY_STATUS_TIMEOUT_US);
-	if (ret < 0) {
+	if (ret < 0)
 		dev_err(dsi->dev,
 			"failed to wait for phy clk lane stop state\n");
-		return ret;
-	}
+
+phy_init_end:
+	if (!IS_ERR(dsi->phy_cfg_clk))
+		clk_disable_unprepare(dsi->phy_cfg_clk);
 
 	return ret;
 }
@@ -878,6 +901,7 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
+	const struct dw_mipi_dsi_plat_data *pdata = dsi->pdata;
 	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
 	u32 val;
 
@@ -886,6 +910,10 @@ static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
 		return;
 	}
 
+	if (pdata->grf_dsi0_mode_reg)
+		regmap_write(dsi->grf_regmap, pdata->grf_dsi0_mode_reg,
+			     pdata->grf_dsi0_mode);
+
 	dw_mipi_dsi_phy_init(dsi);
 	dw_mipi_dsi_wait_for_two_frames(dsi);
 
@@ -895,11 +923,11 @@ static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
 	clk_disable_unprepare(dsi->pclk);
 
 	if (mux)
-		val = DSI0_SEL_VOP_LIT | (DSI0_SEL_VOP_LIT << 16);
+		val = pdata->dsi0_en_bit | (pdata->dsi0_en_bit << 16);
 	else
-		val = DSI0_SEL_VOP_LIT << 16;
+		val = pdata->dsi0_en_bit << 16;
 
-	regmap_write(dsi->grf_regmap, GRF_SOC_CON6, val);
+	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
 	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
 }
 
@@ -1075,6 +1103,19 @@ static enum drm_mode_status rk3288_mipi_dsi_mode_valid(
 }
 
 static struct dw_mipi_dsi_plat_data rk3288_mipi_dsi_drv_data = {
+	.dsi0_en_bit = RK3288_DSI0_SEL_VOP_LIT,
+	.dsi1_en_bit = RK3288_DSI1_SEL_VOP_LIT,
+	.grf_switch_reg = RK3288_GRF_SOC_CON6,
+	.max_data_lanes = 4,
+	.mode_valid = rk3288_mipi_dsi_mode_valid,
+};
+
+static struct dw_mipi_dsi_plat_data rk3399_mipi_dsi_drv_data = {
+	.dsi0_en_bit = RK3399_DSI0_SEL_VOP_LIT,
+	.dsi1_en_bit = RK3399_DSI1_SEL_VOP_LIT,
+	.grf_switch_reg = RK3399_GRF_SOC_CON19,
+	.grf_dsi0_mode = RK3399_GRF_DSI_MODE,
+	.grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
 	.max_data_lanes = 4,
 	.mode_valid = rk3288_mipi_dsi_mode_valid,
 };
@@ -1083,6 +1124,9 @@ static const struct of_device_id dw_mipi_dsi_dt_ids[] = {
 	{
 	 .compatible = "rockchip,rk3288-mipi-dsi",
 	 .data = &rk3288_mipi_dsi_drv_data,
+	}, {
+	 .compatible = "rockchip,rk3399-mipi-dsi",
+	 .data = &rk3399_mipi_dsi_drv_data,
 	},
 	{ /* sentinel */ }
 };
@@ -1133,6 +1177,10 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 		return ret;
 	}
 
+	dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
+	if (IS_ERR(dsi->phy_cfg_clk))
+		dev_dbg(dev, "have not phy_cfg_clk\n");
+
 	ret = clk_prepare_enable(dsi->pllref_clk);
 	if (ret) {
 		dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
-- 
2.6.3

[PATCH 3/7] dt-bindings: add power domain node for dw-mipi-rockchip

[Chris Zhong]

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

 .../devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt        | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
index 4d59df3..e433ba5 100644
--- a/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
+++ b/Documentation/devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt
@@ -17,6 +17,7 @@ Required properties:
 Optional properties:
 - clocks, clock-names: phandle to the dw-mipi phy clock, name should be
 		       "phy_cfg".
+- power-domains: a phandle to mipi dsi power domain node.
 
 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
 [2] Documentation/devicetree/bindings/media/video-interfaces.txt
-- 
2.6.3

[PATCH 3/7] dt-bindings: add power domain node for dw-mipi-rockchip

[Rob Herring]

On Fri, Jul 08, 2016 at 05:04:57PM +0800, Chris Zhong wrote:
> Signed-off-by: Chris Zhong <zyw@rock-chips.com>
> ---
> 
>  .../devicetree/bindings/display/rockchip/dw_mipi_dsi_rockchip.txt        | 1 +
>  1 file changed, 1 insertion(+)

Acked-by: Rob Herring <robh@kernel.org>

[PATCH 4/7] drm/rockchip: dw-mipi: add dw-mipi power domain support

[Chris Zhong]

Reference the power domain incase dw-mipi power down when
in use.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 100da01..15ba796 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -12,6 +12,7 @@
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
 #include <drm/drm_atomic_helper.h>
@@ -293,6 +294,7 @@ struct dw_mipi_dsi {
 	struct clk *pclk;
 	struct clk *phy_cfg_clk;
 
+	int dpms_mode;
 	unsigned int lane_mbps; /* per lane */
 	u32 channel;
 	u32 lanes;
@@ -844,6 +846,11 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 	int ret;
 
+	if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
+		return;
+
+	pm_runtime_get_sync(dsi->dev);
+
 	dsi->mode = adjusted_mode;
 
 	ret = dw_mipi_dsi_get_lane_bps(dsi);
@@ -876,6 +883,9 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 
+	if (dsi->dpms_mode != DRM_MODE_DPMS_ON)
+		return;
+
 	drm_panel_disable(dsi->panel);
 
 	if (clk_prepare_enable(dsi->pclk)) {
@@ -896,6 +906,8 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
 	dw_mipi_dsi_disable(dsi);
 	clk_disable_unprepare(dsi->pclk);
+	pm_runtime_put(dsi->dev);
+	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
 }
 
 static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
@@ -929,6 +941,7 @@ static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
 
 	regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
 	dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
+	dsi->dpms_mode = DRM_MODE_DPMS_ON;
 }
 
 static int
@@ -1150,6 +1163,7 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 
 	dsi->dev = dev;
 	dsi->pdata = pdata;
+	dsi->dpms_mode = DRM_MODE_DPMS_OFF;
 
 	ret = rockchip_mipi_parse_dt(dsi);
 	if (ret)
@@ -1195,6 +1209,8 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 
 	dev_set_drvdata(dev, dsi);
 
+	pm_runtime_enable(dev);
+
 	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
 	dsi->dsi_host.dev = dev;
 	return mipi_dsi_host_register(&dsi->dsi_host);
@@ -1210,6 +1226,7 @@ static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
 	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
 
 	mipi_dsi_host_unregister(&dsi->dsi_host);
+	pm_runtime_disable(dev);
 	clk_disable_unprepare(dsi->pllref_clk);
 }
 
-- 
2.6.3

[PATCH 5/7] drm/rockchip: dw-mipi: support HPD poll

[Chris Zhong]

At the first time of bind, there is no any panel attach in mipi. Add a
DRM_CONNECTOR_POLL_HPD porperty to detect the panel status, when panel
probe, the dw_mipi_dsi_host_attach would be called, then mipi-dsi will
trigger a event to notify the drm framework.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 41 ++++++++++++++++++++++++++++------
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 15ba796..72d7f48 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -285,6 +285,7 @@ struct dw_mipi_dsi {
 	struct drm_encoder encoder;
 	struct drm_connector connector;
 	struct mipi_dsi_host dsi_host;
+	struct device_node *panel_node;
 	struct drm_panel *panel;
 	struct device *dev;
 	struct regmap *grf_regmap;
@@ -462,7 +463,6 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 	dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
 				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
 
-
 	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
 				 val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -550,11 +550,11 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->lanes = device->lanes;
 	dsi->channel = device->channel;
 	dsi->format = device->format;
-	dsi->panel = of_drm_find_panel(device->dev.of_node);
-	if (dsi->panel)
-		return drm_panel_attach(dsi->panel, &dsi->connector);
+	dsi->panel_node = device->dev.of_node;
+	if (dsi->connector.dev)
+		drm_helper_hpd_irq_event(dsi->connector.dev);
 
-	return -EINVAL;
+	return 0;
 }
 
 static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
@@ -562,7 +562,10 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 {
 	struct dw_mipi_dsi *dsi = host_to_dsi(host);
 
-	drm_panel_detach(dsi->panel);
+	dsi->panel_node = NULL;
+
+	if (dsi->connector.dev)
+		drm_helper_hpd_irq_event(dsi->connector.dev);
 
 	return 0;
 }
@@ -1022,13 +1025,33 @@ static struct drm_connector_helper_funcs dw_mipi_dsi_connector_helper_funcs = {
 static enum drm_connector_status
 dw_mipi_dsi_detect(struct drm_connector *connector, bool force)
 {
-	return connector_status_connected;
+	struct dw_mipi_dsi *dsi = con_to_dsi(connector);
+
+
+	if (!dsi->panel) {
+		dsi->panel = of_drm_find_panel(dsi->panel_node);
+		if (dsi->panel)
+			drm_panel_attach(dsi->panel, &dsi->connector);
+	} else if (!dsi->panel_node) {
+		struct drm_encoder *encoder;
+
+		encoder = platform_get_drvdata(to_platform_device(dsi->dev));
+		dw_mipi_dsi_encoder_disable(encoder);
+		drm_panel_detach(dsi->panel);
+		dsi->panel = NULL;
+	}
+
+	if (dsi->panel)
+		return connector_status_connected;
+
+	return connector_status_disconnected;
 }
 
 static void dw_mipi_dsi_drm_connector_destroy(struct drm_connector *connector)
 {
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
+	connector->dev = NULL;
 }
 
 static struct drm_connector_funcs dw_mipi_dsi_atomic_connector_funcs = {
@@ -1069,6 +1092,8 @@ static int dw_mipi_dsi_register(struct drm_device *drm,
 		return ret;
 	}
 
+	connector->polled = DRM_CONNECTOR_POLL_HPD;
+
 	drm_connector_helper_add(connector,
 			&dw_mipi_dsi_connector_helper_funcs);
 
@@ -1225,6 +1250,8 @@ static void dw_mipi_dsi_unbind(struct device *dev, struct device *master,
 {
 	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
 
+	dw_mipi_dsi_encoder_disable(&dsi->encoder);
+
 	mipi_dsi_host_unregister(&dsi->dsi_host);
 	pm_runtime_disable(dev);
 	clk_disable_unprepare(dsi->pllref_clk);
-- 
2.6.3

[PATCH 5/7] drm/rockchip: dw-mipi: support HPD poll

[John Keeping]

On Fri,  8 Jul 2016 17:04:59 +0800, Chris Zhong wrote:

> At the first time of bind, there is no any panel attach in mipi. Add a
> DRM_CONNECTOR_POLL_HPD porperty to detect the panel status, when panel
> probe, the dw_mipi_dsi_host_attach would be called, then mipi-dsi will
> trigger a event to notify the drm framework.
> 
> Signed-off-by: Chris Zhong <zyw@rock-chips.com>

Can we do something like this instead?  We know that the panel must
always be attached and this has the advantage that the display size will
be known when the framebuffer console loads.

-- >8 --
Subject: [PATCH] drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded

This ensures that the output resolution is known before fbcon loads.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 6ef5f3be8468..c0499266d116 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1154,10 +1154,17 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 
 	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
 	dsi->dsi_host.dev = dev;
-	return mipi_dsi_host_register(&dsi->dsi_host);
+	ret = mipi_dsi_host_register(&dsi->dsi_host);
+	if (!ret && !dsi->panel) {
+		mipi_dsi_host_unregister(&dsi->dsi_host);
+		drm_encoder_cleanup(&dsi->encoder);
+		drm_connector_cleanup(&dsi->connector);
+		ret = -EPROBE_DEFER;
+	}
 
 err_pllref:
-	clk_disable_unprepare(dsi->pllref_clk);
+	if (ret)
+		clk_disable_unprepare(dsi->pllref_clk);
 	return ret;
 }
 

[PATCH 5/7] drm/rockchip: dw-mipi: support HPD poll

[Mark yao]

On 2016?07?08? 21:52, John Keeping wrote:
> On Fri,  8 Jul 2016 17:04:59 +0800, Chris Zhong wrote:
>
>> At the first time of bind, there is no any panel attach in mipi. Add a
>> DRM_CONNECTOR_POLL_HPD porperty to detect the panel status, when panel
>> probe, the dw_mipi_dsi_host_attach would be called, then mipi-dsi will
>> trigger a event to notify the drm framework.
>>
>> Signed-off-by: Chris Zhong <zyw@rock-chips.com>
> Can we do something like this instead?  We know that the panel must
> always be attached and this has the advantage that the display size will
> be known when the framebuffer console loads.
>
> -- >8 --
> Subject: [PATCH] drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
>
> This ensures that the output resolution is known before fbcon loads.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index 6ef5f3be8468..c0499266d116 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -1154,10 +1154,17 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
>   
>   	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>   	dsi->dsi_host.dev = dev;
> -	return mipi_dsi_host_register(&dsi->dsi_host);
> +	ret = mipi_dsi_host_register(&dsi->dsi_host);
> +	if (!ret && !dsi->panel) {
> +		mipi_dsi_host_unregister(&dsi->dsi_host);
> +		drm_encoder_cleanup(&dsi->encoder);
> +		drm_connector_cleanup(&dsi->connector);
> +		ret = -EPROBE_DEFER;

Hi John

Do you verify this patch? I do the similar change before, but found 
panel can't probe.

mipi_dsi_host_register will call device_add, I think the panel probe 
need this.

Seems that mipi panel probe request mipi_dsi_host_register, 
mipi_dsi_host_register request panel on your patch, endless loop.

Thanks.

> +	}
>   
>   err_pllref:
> -	clk_disable_unprepare(dsi->pllref_clk);
> +	if (ret)
> +		clk_disable_unprepare(dsi->pllref_clk);
>   	return ret;
>   }
>   
>
>
>


-- 
?ark Yao

[PATCH 5/7] drm/rockchip: dw-mipi: support HPD poll

[John Keeping]

On Mon, 11 Jul 2016 08:46:53 +0800, Mark yao wrote:

> On 2016?07?08? 21:52, John Keeping wrote:
> > On Fri,  8 Jul 2016 17:04:59 +0800, Chris Zhong wrote:
> >  
> >> At the first time of bind, there is no any panel attach in mipi. Add a
> >> DRM_CONNECTOR_POLL_HPD porperty to detect the panel status, when panel
> >> probe, the dw_mipi_dsi_host_attach would be called, then mipi-dsi will
> >> trigger a event to notify the drm framework.
> >>
> >> Signed-off-by: Chris Zhong <zyw@rock-chips.com>  
> > Can we do something like this instead?  We know that the panel must
> > always be attached and this has the advantage that the display size will
> > be known when the framebuffer console loads.
> >  
> > -- >8 --  
> > Subject: [PATCH] drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
> >
> > This ensures that the output resolution is known before fbcon loads.
> >
> > Signed-off-by: John Keeping <john@metanate.com>
> > ---
> >   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 11 +++++++++--
> >   1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > index 6ef5f3be8468..c0499266d116 100644
> > --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > @@ -1154,10 +1154,17 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
> >   
> >   	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
> >   	dsi->dsi_host.dev = dev;
> > -	return mipi_dsi_host_register(&dsi->dsi_host);
> > +	ret = mipi_dsi_host_register(&dsi->dsi_host);
> > +	if (!ret && !dsi->panel) {
> > +		mipi_dsi_host_unregister(&dsi->dsi_host);
> > +		drm_encoder_cleanup(&dsi->encoder);
> > +		drm_connector_cleanup(&dsi->connector);
> > +		ret = -EPROBE_DEFER;  
> 
> Do you verify this patch? I do the similar change before, but found 
> panel can't probe.
> 
> mipi_dsi_host_register will call device_add, I think the panel probe 
> need this.
> 
> Seems that mipi panel probe request mipi_dsi_host_register, 
> mipi_dsi_host_register request panel on your patch, endless loop.

Yes, I've been running this patch for months.  It's possible that I have
another patch that is needed to get this to work correctly (I have a
whole set of Rockchip MIPI patches that I need to find time to submit,
for now I've pushed a branch to Github [1]).

I don't know what you mean about the panel probe requesting
mipi_dsi_host_register, the panel probe calls mipi_dsi_attach() and is
itself called from mipi_dsi_host_register().  My patch doesn't change
this at all, the only change is that if the panel driver is not
available, then the probe fails.  Later, once the panel driver has been
registered the probe will succeed.  This is no different from the
current behaviour if the order of probing drivers happens to load the
panel before dw-mipi-dsi.

[1] https://github.com/johnkeeping/linux/commits/topic/rockchip-mipi

> > +	}
> >   
> >   err_pllref:
> > -	clk_disable_unprepare(dsi->pllref_clk);
> > +	if (ret)
> > +		clk_disable_unprepare(dsi->pllref_clk);
> >   	return ret;
> >   }
> >   
> >
> >
> >  
> 
> 

[PATCH 6/7] drm/rockchip: dw-mipi: fix phy clk lane stop state timeout

[Chris Zhong]

Before phy init, the detection of phy state should be controlled
manually. After that, we can switch the detection to hardward,
it is automatic. Hence move PHY_TXREQUESTCLKHS setting to the end
of phy init.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 72d7f48..8401185 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -477,6 +477,8 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 		dev_err(dsi->dev,
 			"failed to wait for phy clk lane stop state\n");
 
+	dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
+
 phy_init_end:
 	if (!IS_ERR(dsi->phy_cfg_clk))
 		clk_disable_unprepare(dsi->phy_cfg_clk);
@@ -714,7 +716,6 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 		  | PHY_RSTZ | PHY_SHUTDOWNZ);
 	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
 		  TX_ESC_CLK_DIVIDSION(7));
-	dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
 }
 
 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
-- 
2.6.3

[PATCH 7/7] drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel

[Chris Zhong]

Set the lanes bps to 1 / 0.9 times of pclk, the margin is not enough
for some panel, it will cause the screen display is not normal, so
increases the badnwidth to 1 / 0.8.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>

---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 8401185..fca7dde 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -503,8 +503,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 
 	mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC);
 	if (mpclk) {
-		/* take 1 / 0.9, since mbps must big than bandwidth of RGB */
-		tmp = mpclk * (bpp / dsi->lanes) * 10 / 9;
+		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
+		tmp = mpclk * (bpp / dsi->lanes) * 10 / 8;
 		if (tmp < max_mbps)
 			target_mbps = tmp;
 		else
-- 
2.6.3