[PATCH 00/27] drm/rockchip: MIPI fixes & improvements

[PATCH 00/27] drm/rockchip: MIPI fixes & improvements

[John Keeping]

This is a bit of a mixed selection of patches to all areas of the
Rockchip dw-mipi-dsi driver, which I've been using for a while.

The first few patches fix the driver's use of the atomic API by removing
hardware manipulation from the mode_set hook:

  drm/rockchip: dw-mipi-dsi: use mode from display state
  drm/rockchip: dw-mipi-dsi: pass new mode into MIPI mode set
  drm/rockchip: dw-mipi-dsi: don't configure hardware in mode_set for
    MIPI
  drm/rockchip: dw-mipi-dsi: rename commit hook to enable

The following several patches fix various aspects of DSI host transfers
in order to improve support for displays that need to be set up via DSI
commands:

  drm/rockchip: dw-mipi-dsi: fix command header writes
  drm/rockchip: dw-mipi-dsi: fix generic packet status check
  drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf
  drm/rockchip: dw-mipi-dsi: include bad value in error message
  drm/rockchip: dw-mipi-dsi: respect message flags
  drm/rockchip: dw-mipi-dsi: only request HS clock when required
  drm/rockchip: dw-mipi-dsi: don't assume buffer is aligned
  drm/rockchip: dw-mipi-dsi: prepare panel after phy init
  drm/rockchip: dw-mipi-dsi: allow commands in panel_disable

Then a bunch of patches to improve the PHY PLL and other clock setup:

  drm/rockchip: dw-mipi-dsi: fix escape clock rate
  drm/rockchip: dw-mipi-dsi: ensure PHY is reset
  drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable
  drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured
  drm/rockchip: dw-mipi-dsi: properly configure PHY timing
  drm/rockchip: dw-mipi-dsi: improve PLL configuration

A couple of patches make the VOP and MIPI host consistent when panels do
not set explicit hsync/vsync polarities:

  drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC
  drm/rockchip: vop: test for P{H,V}SYNC

The following patch fixes fbcon by making sure that the output
resolution is known before it loads:

  drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded

Then a patch that should be self-explanatory:

  drm/rockchip: dw-mipi-dsi: support non-burst modes

And the final two patches were useful in development but aren't really
needed once everything's working:

  drm/rockchip: dw-mipi-dsi: add reset control
  drm/rockchip: dw-mipi-dsi: support read commands


John Keeping (26):
  drm/rockchip: dw-mipi-dsi: use mode from display state
  drm/rockchip: dw-mipi-dsi: pass new mode into MIPI mode set
  drm/rockchip: dw-mipi-dsi: don't configure hardware in mode_set for
    MIPI
  drm/rockchip: dw-mipi-dsi: rename commit hook to enable
  drm/rockchip: dw-mipi-dsi: fix command header writes
  drm/rockchip: dw-mipi-dsi: fix generic packet status check
  drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf
  drm/rockchip: dw-mipi-dsi: include bad value in error message
  drm/rockchip: dw-mipi-dsi: respect message flags
  drm/rockchip: dw-mipi-dsi: only request HS clock when required
  drm/rockchip: dw-mipi-dsi: don't assume buffer is aligned
  drm/rockchip: dw-mipi-dsi: prepare panel after phy init
  drm/rockchip: dw-mipi-dsi: allow commands in panel_disable
  drm/rockchip: dw-mipi-dsi: fix escape clock rate
  drm/rockchip: dw-mipi-dsi: ensure PHY is reset
  drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable
  drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured
  drm/rockchip: dw-mipi-dsi: properly configure PHY timing
  drm/rockchip: dw-mipi-dsi: improve PLL configuration
  drm/rockchip: dw-mipi-dsi: use specific poll helper
  drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC
  drm/rockchip: vop: test for P{H,V}SYNC
  drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
  drm/rockchip: dw-mipi-dsi: support non-burst modes
  drm/rockchip: dw-mipi-dsi: add reset control
  drm/rockchip: dw-mipi-dsi: support read commands

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c      | 325 ++++++++++++++++++++--------
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   4 +-
 2 files changed, 234 insertions(+), 95 deletions(-)

-- 
2.10.0.278.g4f427b1.dirty

[PATCH 01/26] drm/rockchip: dw-mipi-dsi: use mode from display state

[John Keeping]

There is no need to keep a pointer to the mode around since we know it
will be present in the connector state.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index ca22e5ee89ca..a87037556f5c 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -286,7 +286,6 @@ struct dw_mipi_dsi {
 	u32 format;
 	u16 input_div;
 	u16 feedback_div;
-	struct drm_display_mode *mode;
 
 	const struct dw_mipi_dsi_plat_data *pdata;
 };
@@ -332,9 +331,10 @@ static int max_mbps_to_testdin(unsigned int max_mbps)
  */
 static void dw_mipi_dsi_wait_for_two_frames(struct dw_mipi_dsi *dsi)
 {
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 	int refresh, two_frames;
 
-	refresh = drm_mode_vrefresh(dsi->mode);
+	refresh = drm_mode_vrefresh(mode);
 	two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2;
 	msleep(two_frames);
 }
@@ -461,6 +461,7 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 
 static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 {
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 	unsigned int i, pre;
 	unsigned long mpclk, pllref, tmp;
 	unsigned int m = 1, n = 1, target_mbps = 1000;
@@ -474,7 +475,7 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 		return bpp;
 	}
 
-	mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC);
+	mpclk = DIV_ROUND_UP(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;
@@ -689,9 +690,9 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 	dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
 }
 
-static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
-				   struct drm_display_mode *mode)
+static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
 {
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 	u32 val = 0, color = 0;
 
 	switch (dsi->format) {
@@ -726,9 +727,10 @@ static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
 	dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
 }
 
-static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
-					    struct drm_display_mode *mode)
+static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi)
 {
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
+
 	dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
 }
 
@@ -744,12 +746,13 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
 static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
 					   u32 hcomponent)
 {
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 	u32 frac, lbcc;
 
 	lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
 
-	frac = lbcc % dsi->mode->clock;
-	lbcc = lbcc / dsi->mode->clock;
+	frac = lbcc % mode->clock;
+	lbcc = lbcc / mode->clock;
 	if (frac)
 		lbcc++;
 
@@ -759,7 +762,7 @@ static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
 static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi)
 {
 	u32 htotal, hsa, hbp, lbcc;
-	struct drm_display_mode *mode = dsi->mode;
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 
 	htotal = mode->htotal;
 	hsa = mode->hsync_end - mode->hsync_start;
@@ -778,7 +781,7 @@ static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi)
 static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi)
 {
 	u32 vactive, vsa, vfp, vbp;
-	struct drm_display_mode *mode = dsi->mode;
+	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 
 	vactive = mode->vdisplay;
 	vsa = mode->vsync_end - mode->vsync_start;
@@ -821,8 +824,6 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 	int ret;
 
-	dsi->mode = adjusted_mode;
-
 	ret = dw_mipi_dsi_get_lane_bps(dsi);
 	if (ret < 0)
 		return;
@@ -833,10 +834,10 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
 	}
 
 	dw_mipi_dsi_init(dsi);
-	dw_mipi_dsi_dpi_config(dsi, mode);
+	dw_mipi_dsi_dpi_config(dsi);
 	dw_mipi_dsi_packet_handler_config(dsi);
 	dw_mipi_dsi_video_mode_config(dsi);
-	dw_mipi_dsi_video_packet_config(dsi, mode);
+	dw_mipi_dsi_video_packet_config(dsi);
 	dw_mipi_dsi_command_mode_config(dsi);
 	dw_mipi_dsi_line_timer_config(dsi);
 	dw_mipi_dsi_vertical_timing_config(dsi);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 02/26] drm/rockchip: dw-mipi-dsi: pass new mode into MIPI mode set

[John Keeping]

In the atomic world the new connector state is not set when mode_set is
called and we should use the adjusted_mode parameter.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index a87037556f5c..fa90bb615fd0 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -459,9 +459,9 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 	return ret;
 }
 
-static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
+static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
+				    struct drm_display_mode *mode)
 {
-	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
 	unsigned int i, pre;
 	unsigned long mpclk, pllref, tmp;
 	unsigned int m = 1, n = 1, target_mbps = 1000;
@@ -824,7 +824,7 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 	int ret;
 
-	ret = dw_mipi_dsi_get_lane_bps(dsi);
+	ret = dw_mipi_dsi_get_lane_bps(dsi, adjusted_mode);
 	if (ret < 0)
 		return;
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 03/26] drm/rockchip: dw-mipi-dsi: don't configure hardware in mode_set for MIPI

[John Keeping]

With atomic modesetting the hardware will be powered off when the
mode_set function is called.  We should configure the hardware in the
commit function (or even the enable function, but switching from commit
to enable is left for a future patch).

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 40 +++++++++++++---------------------
 1 file changed, 15 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index fa90bb615fd0..5925a185ed76 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -822,32 +822,8 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
 					struct drm_display_mode *adjusted_mode)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
-	int ret;
-
-	ret = dw_mipi_dsi_get_lane_bps(dsi, adjusted_mode);
-	if (ret < 0)
-		return;
-
-	if (clk_prepare_enable(dsi->pclk)) {
-		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
-		return;
-	}
 
-	dw_mipi_dsi_init(dsi);
-	dw_mipi_dsi_dpi_config(dsi);
-	dw_mipi_dsi_packet_handler_config(dsi);
-	dw_mipi_dsi_video_mode_config(dsi);
-	dw_mipi_dsi_video_packet_config(dsi);
-	dw_mipi_dsi_command_mode_config(dsi);
-	dw_mipi_dsi_line_timer_config(dsi);
-	dw_mipi_dsi_vertical_timing_config(dsi);
-	dw_mipi_dsi_dphy_timing_config(dsi);
-	dw_mipi_dsi_dphy_interface_config(dsi);
-	dw_mipi_dsi_clear_err(dsi);
-	if (drm_panel_prepare(dsi->panel))
-		dev_err(dsi->dev, "failed to prepare panel\n");
-
-	clk_disable_unprepare(dsi->pclk);
+	dw_mipi_dsi_get_lane_bps(dsi, adjusted_mode);
 }
 
 static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
@@ -887,6 +863,20 @@ static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
 		return;
 	}
 
+	dw_mipi_dsi_init(dsi);
+	dw_mipi_dsi_dpi_config(dsi);
+	dw_mipi_dsi_packet_handler_config(dsi);
+	dw_mipi_dsi_video_mode_config(dsi);
+	dw_mipi_dsi_video_packet_config(dsi);
+	dw_mipi_dsi_command_mode_config(dsi);
+	dw_mipi_dsi_line_timer_config(dsi);
+	dw_mipi_dsi_vertical_timing_config(dsi);
+	dw_mipi_dsi_dphy_timing_config(dsi);
+	dw_mipi_dsi_dphy_interface_config(dsi);
+	dw_mipi_dsi_clear_err(dsi);
+	if (drm_panel_prepare(dsi->panel))
+		dev_err(dsi->dev, "failed to prepare panel\n");
+
 	dw_mipi_dsi_phy_init(dsi);
 	dw_mipi_dsi_wait_for_two_frames(dsi);
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 04/26] drm/rockchip: dw-mipi-dsi: rename commit hook to enable

[John Keeping]

Rockchip DRM is fully atomic and commit is deprecated for atomic
drivers.  No changed are needed beyond renaming the function.

Signed-off-by: John Keeping <john@metanate.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 5925a185ed76..fac2429b9d6d 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -852,7 +852,7 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 	clk_disable_unprepare(dsi->pclk);
 }
 
-static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
+static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 	int mux = drm_of_encoder_active_endpoint_id(dsi->dev->of_node, encoder);
@@ -924,7 +924,7 @@ dw_mipi_dsi_encoder_atomic_check(struct drm_encoder *encoder,
 
 static struct drm_encoder_helper_funcs
 dw_mipi_dsi_encoder_helper_funcs = {
-	.commit = dw_mipi_dsi_encoder_commit,
+	.enable = dw_mipi_dsi_encoder_enable,
 	.mode_set = dw_mipi_dsi_encoder_mode_set,
 	.disable = dw_mipi_dsi_encoder_disable,
 	.atomic_check = dw_mipi_dsi_encoder_atomic_check,
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 05/26] drm/rockchip: dw-mipi-dsi: fix command header writes

[John Keeping]

In a couple of places here we use "val" for the value that is about to
be written to a register but then reuse the same variable for the value
of a status register before we get around to writing it.  Rename the
value to be written to so that we write the value we intend to and not
what we have just read from the status register.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index fac2429b9d6d..03915bf9c97d 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -543,9 +543,10 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 	return 0;
 }
 
-static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 val)
+static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 {
 	int ret;
+	u32 val;
 
 	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
 				 val, !(val & GEN_CMD_FULL), 1000,
@@ -555,7 +556,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 val)
 		return ret;
 	}
 
-	dsi_write(dsi, DSI_GEN_HDR, val);
+	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
 
 	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
 				 val, val & (GEN_CMD_EMPTY | GEN_PLD_W_EMPTY),
@@ -588,8 +589,9 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 {
 	const u32 *tx_buf = msg->tx_buf;
 	int len = msg->tx_len, pld_data_bytes = sizeof(*tx_buf), ret;
-	u32 val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
+	u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
 	u32 remainder = 0;
+	u32 val;
 
 	if (msg->tx_len < 3) {
 		dev_err(dsi->dev, "wrong tx buf length %zu for long write\n",
@@ -618,7 +620,7 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 		}
 	}
 
-	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, val);
+	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
 }
 
 static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 06/26] drm/rockchip: dw-mipi-dsi: fix generic packet status check

[John Keeping]

We want to check that both the GEN_CMD_EMPTY and GEN_PLD_W_EMPTY bits
are set so we can't just check "val & mask" because that will be true if
either bit is set.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 03915bf9c97d..f2bed2a0f907 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -546,7 +546,7 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 {
 	int ret;
-	u32 val;
+	u32 val, mask;
 
 	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
 				 val, !(val & GEN_CMD_FULL), 1000,
@@ -558,8 +558,9 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 
 	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
 
+	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
 	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
-				 val, val & (GEN_CMD_EMPTY | GEN_PLD_W_EMPTY),
+				 val, (val & mask) == mask,
 				 1000, CMD_PKT_STATUS_TIMEOUT_US);
 	if (ret < 0) {
 		dev_err(dsi->dev, "failed to write command FIFO\n");
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 07/26] drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf

[John Keeping]

As a side-effect of this, encode the endianness explicitly rather than
casting a u16.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index f2bed2a0f907..38186df8476e 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -573,8 +573,13 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
 				       const struct mipi_dsi_msg *msg)
 {
-	const u16 *tx_buf = msg->tx_buf;
-	u32 val = GEN_HDATA(*tx_buf) | GEN_HTYPE(msg->type);
+	const u8 *tx_buf = msg->tx_buf;
+	u32 val = GEN_HTYPE(msg->type);
+
+	if (msg->tx_len > 0)
+		val |= GEN_HDATA(tx_buf[0]);
+	if (msg->tx_len > 1)
+		val |= GEN_HDATA(tx_buf[1] << 8);
 
 	if (msg->tx_len > 2) {
 		dev_err(dsi->dev, "too long tx buf length %zu for short write\n",
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 08/26] drm/rockchip: dw-mipi-dsi: include bad value in error message

[John Keeping]

As an aid to debugging.

Signed-off-by: John Keeping <john@metanate.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 38186df8476e..a25db02e1c19 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -645,7 +645,8 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 		ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
 		break;
 	default:
-		dev_err(dsi->dev, "unsupported message type\n");
+		dev_err(dsi->dev, "unsupported message type 0x%02x\n",
+			msg->type);
 		ret = -EINVAL;
 	}
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 09/26] drm/rockchip: dw-mipi-dsi: respect message flags

[John Keeping]

Instead of always sending commands in LP mode, respect the
MIPI_DSI_MSG_USE_LPM flag to decide how to send each message.  Also
request acks if MIPI_DSI_MSG_REQ_ACK is set.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index a25db02e1c19..554336f8023e 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -543,6 +543,19 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 	return 0;
 }
 
+static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
+				   const struct mipi_dsi_msg *msg)
+{
+	u32 val = 0;
+
+	if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
+		val |= EN_ACK_RQST;
+	if (msg->flags & MIPI_DSI_MSG_USE_LPM)
+		val |= CMD_MODE_ALL_LP;
+
+	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
+}
+
 static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 {
 	int ret;
@@ -635,6 +648,8 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 	struct dw_mipi_dsi *dsi = host_to_dsi(host);
 	int ret;
 
+	dw_mipi_message_config(dsi, msg);
+
 	switch (msg->type) {
 	case MIPI_DSI_DCS_SHORT_WRITE:
 	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
@@ -747,7 +762,6 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
 {
 	dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
 	dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
-	dsi_write(dsi, DSI_CMD_MODE_CFG, CMD_MODE_ALL_LP);
 	dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
 }
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 10/26] drm/rockchip: dw-mipi-dsi: only request HS clock when required

[John Keeping]

Requesting the HS clock from the PHY before we initialize it causes an
invalid signal to be sent out since the input clock is not yet
configured.  The PHY databook suggests only asserting this signal when
performing HS transfers, so let's do that.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 554336f8023e..ed2da1bbada9 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -546,13 +546,15 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
 static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
 				   const struct mipi_dsi_msg *msg)
 {
+	bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
 	u32 val = 0;
 
 	if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
 		val |= EN_ACK_RQST;
-	if (msg->flags & MIPI_DSI_MSG_USE_LPM)
+	if (lpm)
 		val |= CMD_MODE_ALL_LP;
 
+	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
 	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
 }
 
@@ -694,6 +696,7 @@ static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
 		dsi_write(dsi, DSI_PWR_UP, RESET);
 		dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
 		dw_mipi_dsi_video_mode_config(dsi);
+		dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
 		dsi_write(dsi, DSI_PWR_UP, POWERUP);
 	}
 }
@@ -711,7 +714,6 @@ 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)
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 11/26] drm/rockchip: dw-mipi-dsi: don't assume buffer is aligned

[John Keeping]

By dereferencing the MIPI command buffer as a u32* we rely on it being
correctly aligned on ARM, but this may not be the case.  Copy it into a
stack variable that will be correctly aligned.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index ed2da1bbada9..4c945cc4d31a 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -608,10 +608,10 @@ static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
 static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 				      const struct mipi_dsi_msg *msg)
 {
-	const u32 *tx_buf = msg->tx_buf;
-	int len = msg->tx_len, pld_data_bytes = sizeof(*tx_buf), ret;
+	const u8 *tx_buf = msg->tx_buf;
+	int len = msg->tx_len, pld_data_bytes = sizeof(u32), ret;
 	u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
-	u32 remainder = 0;
+	u32 remainder;
 	u32 val;
 
 	if (msg->tx_len < 3) {
@@ -622,12 +622,14 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 
 	while (DIV_ROUND_UP(len, pld_data_bytes)) {
 		if (len < pld_data_bytes) {
+			remainder = 0;
 			memcpy(&remainder, tx_buf, len);
 			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
 			len = 0;
 		} else {
-			dsi_write(dsi, DSI_GEN_PLD_DATA, *tx_buf);
-			tx_buf++;
+			memcpy(&remainder, tx_buf, pld_data_bytes);
+			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
+			tx_buf += pld_data_bytes;
 			len -= pld_data_bytes;
 		}
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 12/26] drm/rockchip: dw-mipi-dsi: prepare panel after phy init

[John Keeping]

Some panels need to be configured with commands sent over the MIPI link,
which they will do in the prepare hook.  Call this after the PHY has
been initialized so that we are able to send commands to the panel.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 4c945cc4d31a..9ff1cac5ef63 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -901,12 +901,14 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
 	dw_mipi_dsi_dphy_timing_config(dsi);
 	dw_mipi_dsi_dphy_interface_config(dsi);
 	dw_mipi_dsi_clear_err(dsi);
-	if (drm_panel_prepare(dsi->panel))
-		dev_err(dsi->dev, "failed to prepare panel\n");
 
 	dw_mipi_dsi_phy_init(dsi);
 	dw_mipi_dsi_wait_for_two_frames(dsi);
 
+	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
+	if (drm_panel_prepare(dsi->panel))
+		dev_err(dsi->dev, "failed to prepare panel\n");
+
 	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
 	drm_panel_enable(dsi->panel);
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 13/26] drm/rockchip: dw-mipi-dsi: allow commands in panel_disable

[John Keeping]

Panel drivers may want to sent commands during the disable function, for
example MIPI_DCS_SET_DISPLAY_OFF before the video signal ends.  In order
to send commands we need to write to registers, so pclk must be enabled.

While changing this, remove the unnecessary code after the panel
unprepare call which seems to be a workaround for a specific panel and
thus belongs in the panel driver.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 9ff1cac5ef63..5e343b54f0d0 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -857,24 +857,16 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
 {
 	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
 
-	drm_panel_disable(dsi->panel);
-
 	if (clk_prepare_enable(dsi->pclk)) {
 		dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
 		return;
 	}
 
+	drm_panel_disable(dsi->panel);
+
 	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
 	drm_panel_unprepare(dsi->panel);
-	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_VID_MODE);
 
-	/*
-	 * This is necessary to make sure the peripheral will be driven
-	 * normally when the display is enabled again later.
-	 */
-	msleep(120);
-
-	dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
 	dw_mipi_dsi_disable(dsi);
 	clk_disable_unprepare(dsi->pclk);
 }
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 14/26] drm/rockchip: dw-mipi-dsi: fix escape clock rate

[John Keeping]

Use the same calculation as the vendor kernel to derive the escape clock
speed.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 5e343b54f0d0..8854b8670d72 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -711,11 +711,13 @@ static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
 
 static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 {
+	u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
+
 	dsi_write(dsi, DSI_PWR_UP, RESET);
 	dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
 		  | PHY_RSTZ | PHY_SHUTDOWNZ);
 	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
-		  TX_ESC_CLK_DIVIDSION(7));
+		  TX_ESC_CLK_DIVIDSION(esc_clk_division));
 }
 
 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 14/27] drm/rockchip: dw-mipi-dsi: use specific poll helper

[John Keeping]

As the documentation for readx_poll_timeout says, we want to use the
specialized macro for readl rather than using the generic version
directly.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 5e343b54f0d0..097b3b0af78f 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -440,14 +440,14 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
 
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
 				 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;
 	}
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
 				 val, val & STOP_STATE_CLK_LANE, 1000,
 				 PHY_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -563,7 +563,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 	int ret;
 	u32 val, mask;
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 				 val, !(val & GEN_CMD_FULL), 1000,
 				 CMD_PKT_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -574,7 +574,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
 
 	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
-	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 				 val, (val & mask) == mask,
 				 1000, CMD_PKT_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -633,7 +633,7 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 			len -= pld_data_bytes;
 		}
 
-		ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+		ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 					 val, !(val & GEN_PLD_W_FULL), 1000,
 					 CMD_PKT_STATUS_TIMEOUT_US);
 		if (ret < 0) {
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 15/26] drm/rockchip: dw-mipi-dsi: ensure PHY is reset

[John Keeping]

Also don't power up the DSI host at this point since this is not
necessary in order to configure the PHY and we do so later when
selecting video or command mode.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 8854b8670d72..73c28e205fc5 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -398,7 +398,10 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 		return testdin;
 	}
 
-	dsi_write(dsi, DSI_PWR_UP, POWERUP);
+	/* Start by clearing PHY state */
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
 
 	dw_mipi_dsi_phy_write(dsi, 0x10, BYPASS_VCO_RANGE |
 					 VCO_RANGE_CON_SEL(vco) |
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 15/27] drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC

[John Keeping]

This matches other drivers.

Signed-off-by: John Keeping <john@metanate.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 097b3b0af78f..7b4f4f150a0d 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -738,9 +738,9 @@ static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
 		break;
 	}
 
-	if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 		val |= VSYNC_ACTIVE_LOW;
-	if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 		val |= HSYNC_ACTIVE_LOW;
 
 	dsi_write(dsi, DSI_DPI_VCID, DPI_VID(dsi->channel));
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 16/26] drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable

[John Keeping]

We should configure these functions before enabling them.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 73c28e205fc5..f824c99b872e 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -421,6 +421,11 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
 					 HIGH_PROGRAM_EN);
 
+	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
+					 BIASEXTR_SEL(BIASEXTR_127_7));
+	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
+					 BANDGAP_SEL(BANDGAP_96_10));
+
 	dw_mipi_dsi_phy_write(dsi, 0x20, POWER_CONTROL | INTERNAL_REG_CURRENT |
 					 BIAS_BLOCK_ON | BANDGAP_ON);
 
@@ -430,10 +435,6 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 					 SETRD_MAX | POWER_MANAGE |
 					 TER_RESISTORS_ON);
 
-	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
-					 BIASEXTR_SEL(BIASEXTR_127_7));
-	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
-					 BANDGAP_SEL(BANDGAP_96_10));
 
 	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | 0xf);
 	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | 0x55);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 16/27] drm/rockchip: dw-mipi-dsi: fix escape clock rate

[John Keeping]

Use the same calculation as the vendor kernel to derive the escape clock
speed.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7b4f4f150a0d..e621b66b9617 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -711,11 +711,13 @@ static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
 
 static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 {
+	u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
+
 	dsi_write(dsi, DSI_PWR_UP, RESET);
 	dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
 		  | PHY_RSTZ | PHY_SHUTDOWNZ);
 	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
-		  TX_ESC_CLK_DIVIDSION(7));
+		  TX_ESC_CLK_DIVIDSION(esc_clk_division));
 }
 
 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 17/26] drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured

[John Keeping]

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

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index f824c99b872e..463e469fd1b8 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -414,12 +414,12 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 
 	dw_mipi_dsi_phy_write(dsi, 0x44, HSFREQRANGE_SEL(testdin));
 
-	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
 	dw_mipi_dsi_phy_write(dsi, 0x17, INPUT_DIVIDER(dsi->input_div));
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_LOW_SEL(dsi->feedback_div) |
 					 LOW_PROGRAM_EN);
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
 					 HIGH_PROGRAM_EN);
+	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
 
 	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
 					 BIASEXTR_SEL(BIASEXTR_127_7));
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 17/27] drm/rockchip: dw-mipi-dsi: ensure PHY is reset

[John Keeping]

Also don't power up the DSI host at this point since this is not
necessary in order to configure the PHY and we do so later when
selecting video or command mode.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index e621b66b9617..e310c3d81bb8 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -398,7 +398,10 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 		return testdin;
 	}
 
-	dsi_write(dsi, DSI_PWR_UP, POWERUP);
+	/* Start by clearing PHY state */
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
 
 	dw_mipi_dsi_phy_write(dsi, 0x10, BYPASS_VCO_RANGE |
 					 VCO_RANGE_CON_SEL(vco) |
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 18/27] drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable

[John Keeping]

We should configure these functions before enabling them.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index e310c3d81bb8..65c89367d8b2 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -421,6 +421,11 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
 					 HIGH_PROGRAM_EN);
 
+	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
+					 BIASEXTR_SEL(BIASEXTR_127_7));
+	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
+					 BANDGAP_SEL(BANDGAP_96_10));
+
 	dw_mipi_dsi_phy_write(dsi, 0x20, POWER_CONTROL | INTERNAL_REG_CURRENT |
 					 BIAS_BLOCK_ON | BANDGAP_ON);
 
@@ -430,10 +435,6 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 					 SETRD_MAX | POWER_MANAGE |
 					 TER_RESISTORS_ON);
 
-	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
-					 BIASEXTR_SEL(BIASEXTR_127_7));
-	dw_mipi_dsi_phy_write(dsi, 0x22, HIGH_PROGRAM_EN |
-					 BANDGAP_SEL(BANDGAP_96_10));
 
 	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | 0xf);
 	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | 0x55);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 18/26] drm/rockchip: dw-mipi-dsi: properly configure PHY timing

[John Keeping]

These values are specified as constant time periods but the PHY
configuration is in terms of the current lane byte clock so using
constant values guarantees that the timings will be outside the
specification with some display configurations.

Derive the necessary configuration from the byte clock in order to
ensure that the PHY configuration is correct.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 36 ++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 463e469fd1b8..55237d72f3f9 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -384,6 +384,26 @@ static void dw_mipi_dsi_phy_write(struct dw_mipi_dsi *dsi, u8 test_code,
 	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
 }
 
+/**
+ * ns2bc - Nanoseconds to byte clock cycles
+ */
+static inline unsigned int ns2bc(struct dw_mipi_dsi *dsi, int ns)
+{
+	unsigned long byte_clk_khz = dsi->lane_mbps * MSEC_PER_SEC / 8;
+
+	return (ns * (byte_clk_khz / 1000) + 999) / 1000;
+}
+
+/**
+ * ns2ui - Nanoseconds to UI time periods
+ */
+static inline unsigned int ns2ui(struct dw_mipi_dsi *dsi, int ns)
+{
+	unsigned long byte_clk_khz = dsi->lane_mbps * MSEC_PER_SEC;
+
+	return (ns * (byte_clk_khz / 1000) + 999) / 1000;
+}
+
 static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 {
 	int ret, testdin, vco, val;
@@ -435,10 +455,18 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 					 SETRD_MAX | POWER_MANAGE |
 					 TER_RESISTORS_ON);
 
-
-	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | 0xf);
-	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | 0x55);
-	dw_mipi_dsi_phy_write(dsi, 0x72, THS_ZERO_PROGRAM_EN | 0xa);
+	dw_mipi_dsi_phy_write(dsi, 0x60, TLP_PROGRAM_EN | ns2bc(dsi, 500));
+	dw_mipi_dsi_phy_write(dsi, 0x61, THS_PRE_PROGRAM_EN | ns2ui(dsi, 40));
+	dw_mipi_dsi_phy_write(dsi, 0x62, THS_ZERO_PROGRAM_EN | ns2bc(dsi, 300));
+	dw_mipi_dsi_phy_write(dsi, 0x63, THS_PRE_PROGRAM_EN | ns2ui(dsi, 100));
+	dw_mipi_dsi_phy_write(dsi, 0x64, BIT(5) | ns2bc(dsi, 100));
+	dw_mipi_dsi_phy_write(dsi, 0x65, BIT(5) | (ns2bc(dsi, 60) + 7));
+
+	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | ns2bc(dsi, 500));
+	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | (ns2ui(dsi, 50) + 5));
+	dw_mipi_dsi_phy_write(dsi, 0x72, THS_ZERO_PROGRAM_EN | (ns2bc(dsi, 140) + 2));
+	dw_mipi_dsi_phy_write(dsi, 0x73, THS_PRE_PROGRAM_EN | (ns2ui(dsi, 60) + 8));
+	dw_mipi_dsi_phy_write(dsi, 0x74, BIT(5) | ns2bc(dsi, 100));
 
 	dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
 				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 19/27] drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured

[John Keeping]

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

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 65c89367d8b2..61cee02e5f72 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -414,12 +414,12 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 
 	dw_mipi_dsi_phy_write(dsi, 0x44, HSFREQRANGE_SEL(testdin));
 
-	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
 	dw_mipi_dsi_phy_write(dsi, 0x17, INPUT_DIVIDER(dsi->input_div));
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_LOW_SEL(dsi->feedback_div) |
 					 LOW_PROGRAM_EN);
 	dw_mipi_dsi_phy_write(dsi, 0x18, LOOP_DIV_HIGH_SEL(dsi->feedback_div) |
 					 HIGH_PROGRAM_EN);
+	dw_mipi_dsi_phy_write(dsi, 0x19, PLL_LOOP_DIV_EN | PLL_INPUT_DIV_EN);
 
 	dw_mipi_dsi_phy_write(dsi, 0x22, LOW_PROGRAM_EN |
 					 BIASEXTR_SEL(BIASEXTR_127_7));
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 19/26] drm/rockchip: dw-mipi-dsi: improve PLL configuration

[John Keeping]

The multiplication ratio for the PLL is required to be even due to the
use of a "by 2 pre-scaler".  Currently we are likely to end up with an
odd multiplier even though there is an equivalent set of parameters with
an even multiplier.

For example, using the 324MHz bit rate with a reference clock of 24MHz
we end up with M = 27, N = 2 whereas the example in the PHY databook
gives M = 54, N = 4 for this bit rate and reference clock.

By walking down through the available multiplier instead of up we are
more likely to hit an even multiplier.  With the above example we do now
get M = 54, N = 4 as given by the databook.

While doing this, change the loop limits to encode the actual limits on
the divisor, which are:

	40MHz >= (pllref / N) >= 5MHz

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

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 55237d72f3f9..7983b2749518 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -520,7 +520,7 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
 	pllref = DIV_ROUND_UP(clk_get_rate(dsi->pllref_clk), USEC_PER_SEC);
 	tmp = pllref;
 
-	for (i = 1; i < 6; i++) {
+	for (i = pllref / 5; i > (pllref / 40); i--) {
 		pre = pllref / i;
 		if ((tmp > (target_mbps % pre)) && (target_mbps / pre < 512)) {
 			tmp = target_mbps % pre;
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 20/27] drm/rockchip: dw-mipi-dsi: properly configure PHY timing

[John Keeping]

These values are specified as constant time periods but the PHY
configuration is in terms of the current lane byte clock so using
constant values guarantees that the timings will be outside the
specification with some display configurations.

Derive the necessary configuration from the byte clock in order to
ensure that the PHY configuration is correct.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 36 ++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 61cee02e5f72..911ddcbab00d 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -384,6 +384,26 @@ static void dw_mipi_dsi_phy_write(struct dw_mipi_dsi *dsi, u8 test_code,
 	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLK | PHY_UNTESTCLR);
 }
 
+/**
+ * ns2bc - Nanoseconds to byte clock cycles
+ */
+static inline unsigned int ns2bc(struct dw_mipi_dsi *dsi, int ns)
+{
+	unsigned long byte_clk_khz = dsi->lane_mbps * MSEC_PER_SEC / 8;
+
+	return (ns * (byte_clk_khz / 1000) + 999) / 1000;
+}
+
+/**
+ * ns2ui - Nanoseconds to UI time periods
+ */
+static inline unsigned int ns2ui(struct dw_mipi_dsi *dsi, int ns)
+{
+	unsigned long byte_clk_khz = dsi->lane_mbps * MSEC_PER_SEC;
+
+	return (ns * (byte_clk_khz / 1000) + 999) / 1000;
+}
+
 static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 {
 	int ret, testdin, vco, val;
@@ -435,10 +455,18 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 					 SETRD_MAX | POWER_MANAGE |
 					 TER_RESISTORS_ON);
 
-
-	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | 0xf);
-	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | 0x55);
-	dw_mipi_dsi_phy_write(dsi, 0x72, THS_ZERO_PROGRAM_EN | 0xa);
+	dw_mipi_dsi_phy_write(dsi, 0x60, TLP_PROGRAM_EN | ns2bc(dsi, 500));
+	dw_mipi_dsi_phy_write(dsi, 0x61, THS_PRE_PROGRAM_EN | ns2ui(dsi, 40));
+	dw_mipi_dsi_phy_write(dsi, 0x62, THS_ZERO_PROGRAM_EN | ns2bc(dsi, 300));
+	dw_mipi_dsi_phy_write(dsi, 0x63, THS_PRE_PROGRAM_EN | ns2ui(dsi, 100));
+	dw_mipi_dsi_phy_write(dsi, 0x64, BIT(5) | ns2bc(dsi, 100));
+	dw_mipi_dsi_phy_write(dsi, 0x65, BIT(5) | (ns2bc(dsi, 60) + 7));
+
+	dw_mipi_dsi_phy_write(dsi, 0x70, TLP_PROGRAM_EN | ns2bc(dsi, 500));
+	dw_mipi_dsi_phy_write(dsi, 0x71, THS_PRE_PROGRAM_EN | (ns2ui(dsi, 50) + 5));
+	dw_mipi_dsi_phy_write(dsi, 0x72, THS_ZERO_PROGRAM_EN | (ns2bc(dsi, 140) + 2));
+	dw_mipi_dsi_phy_write(dsi, 0x73, THS_PRE_PROGRAM_EN | (ns2ui(dsi, 60) + 8));
+	dw_mipi_dsi_phy_write(dsi, 0x74, BIT(5) | ns2bc(dsi, 100));
 
 	dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
 				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 20/26] drm/rockchip: dw-mipi-dsi: use specific poll helper

[John Keeping]

As the documentation for readx_poll_timeout says, we want to use the
specialized macro for readl rather than using the generic version
directly.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7983b2749518..ae7c330cb7ac 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -472,14 +472,14 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 				     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
 
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
 				 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;
 	}
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_PHY_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
 				 val, val & STOP_STATE_CLK_LANE, 1000,
 				 PHY_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -595,7 +595,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 	int ret;
 	u32 val, mask;
 
-	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 				 val, !(val & GEN_CMD_FULL), 1000,
 				 CMD_PKT_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -606,7 +606,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
 	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
 
 	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
-	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 				 val, (val & mask) == mask,
 				 1000, CMD_PKT_STATUS_TIMEOUT_US);
 	if (ret < 0) {
@@ -665,7 +665,7 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 			len -= pld_data_bytes;
 		}
 
-		ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
+		ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
 					 val, !(val & GEN_PLD_W_FULL), 1000,
 					 CMD_PKT_STATUS_TIMEOUT_US);
 		if (ret < 0) {
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 21/27] drm/rockchip: dw-mipi-dsi: improve PLL configuration

[John Keeping]

The multiplication ratio for the PLL is required to be even due to the
use of a "by 2 pre-scaler".  Currently we are likely to end up with an
odd multiplier even though there is an equivalent set of parameters with
an even multiplier.

For example, using the 324MHz bit rate with a reference clock of 24MHz
we end up with M = 27, N = 2 whereas the example in the PHY databook
gives M = 54, N = 4 for this bit rate and reference clock.

By walking down through the available multiplier instead of up we are
more likely to hit an even multiplier.  With the above example we do now
get M = 54, N = 4 as given by the databook.

While doing this, change the loop limits to encode the actual limits on
the divisor, which are:

	40MHz >= (pllref / N) >= 5MHz

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

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 911ddcbab00d..2b26a54972da 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -520,7 +520,7 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
 	pllref = DIV_ROUND_UP(clk_get_rate(dsi->pllref_clk), USEC_PER_SEC);
 	tmp = pllref;
 
-	for (i = 1; i < 6; i++) {
+	for (i = pllref / 5; i > (pllref / 40); i--) {
 		pre = pllref / i;
 		if ((tmp > (target_mbps % pre)) && (target_mbps / pre < 512)) {
 			tmp = target_mbps % pre;
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 21/26] drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC

[John Keeping]

This matches other drivers.

Signed-off-by: John Keeping <john@metanate.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 ae7c330cb7ac..2b26a54972da 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -772,9 +772,9 @@ static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
 		break;
 	}
 
-	if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 		val |= VSYNC_ACTIVE_LOW;
-	if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 		val |= HSYNC_ACTIVE_LOW;
 
 	dsi_write(dsi, DSI_DPI_VCID, DPI_VID(dsi->channel));
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 22/27] drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded

[John Keeping]

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 2b26a54972da..5ecb03c24c2f 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1186,10 +1186,17 @@ 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;
 }
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 22/26] drm/rockchip: vop: test for P{H,V}SYNC

[John Keeping]

When connected to the MIPI DSI output, we need to use N{H,V}SYNC for the
internal connection but these flags are meaningless for DSI panels.
Switch the test so that we do not set the P{H,V}SYNC bits unless the
mode requires it.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index d486049f9722..7c4ce1b2e694 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1030,8 +1030,8 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
 	}
 
 	pin_pol = 0x8;
-	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) ? 0 : 1;
-	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC) ? 0 : (1 << 1);
+	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
+	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) ? (1 << 1) : 0;
 	VOP_CTRL_SET(vop, pin_pol, pin_pol);
 
 	switch (s->output_type) {
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 23/26] drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded

[John Keeping]

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 2b26a54972da..5ecb03c24c2f 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1186,10 +1186,17 @@ 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;
 }
 
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 23/27] drm/rockchip: dw-mipi-dsi: support non-burst modes

[John Keeping]

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 5ecb03c24c2f..d93e620adea6 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -82,6 +82,7 @@
 #define FRAME_BTA_ACK			BIT(14)
 #define ENABLE_LOW_POWER		(0x3f << 8)
 #define ENABLE_LOW_POWER_MASK		(0x3f << 8)
+#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
 #define VID_MODE_TYPE_BURST_SYNC_PULSES		0x2
 #define VID_MODE_TYPE_MASK			0x3
 
@@ -286,6 +287,7 @@ struct dw_mipi_dsi {
 	u32 format;
 	u16 input_div;
 	u16 feedback_div;
+	unsigned long mode_flags;
 
 	const struct dw_mipi_dsi_plat_data *pdata;
 };
@@ -549,15 +551,10 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 		return -EINVAL;
 	}
 
-	if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) ||
-	    !(device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)) {
-		dev_err(dsi->dev, "device mode is unsupported\n");
-		return -EINVAL;
-	}
-
 	dsi->lanes = device->lanes;
 	dsi->channel = device->channel;
 	dsi->format = device->format;
+	dsi->mode_flags = device->mode_flags;
 	dsi->panel = of_drm_find_panel(device->dev.of_node);
 	if (dsi->panel)
 		return drm_panel_attach(dsi->panel, &dsi->connector);
@@ -714,7 +711,12 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
 {
 	u32 val;
 
-	val = VID_MODE_TYPE_BURST_SYNC_PULSES | ENABLE_LOW_POWER;
+	val = ENABLE_LOW_POWER;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+		val |= VID_MODE_TYPE_BURST_SYNC_PULSES;
+	else if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
+		val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
 
 	dsi_write(dsi, DSI_VID_MODE_CFG, val);
 }
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 24/26] drm/rockchip: dw-mipi-dsi: support non-burst modes

[John Keeping]

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 5ecb03c24c2f..d93e620adea6 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -82,6 +82,7 @@
 #define FRAME_BTA_ACK			BIT(14)
 #define ENABLE_LOW_POWER		(0x3f << 8)
 #define ENABLE_LOW_POWER_MASK		(0x3f << 8)
+#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS	0x1
 #define VID_MODE_TYPE_BURST_SYNC_PULSES		0x2
 #define VID_MODE_TYPE_MASK			0x3
 
@@ -286,6 +287,7 @@ struct dw_mipi_dsi {
 	u32 format;
 	u16 input_div;
 	u16 feedback_div;
+	unsigned long mode_flags;
 
 	const struct dw_mipi_dsi_plat_data *pdata;
 };
@@ -549,15 +551,10 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 		return -EINVAL;
 	}
 
-	if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) ||
-	    !(device->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)) {
-		dev_err(dsi->dev, "device mode is unsupported\n");
-		return -EINVAL;
-	}
-
 	dsi->lanes = device->lanes;
 	dsi->channel = device->channel;
 	dsi->format = device->format;
+	dsi->mode_flags = device->mode_flags;
 	dsi->panel = of_drm_find_panel(device->dev.of_node);
 	if (dsi->panel)
 		return drm_panel_attach(dsi->panel, &dsi->connector);
@@ -714,7 +711,12 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
 {
 	u32 val;
 
-	val = VID_MODE_TYPE_BURST_SYNC_PULSES | ENABLE_LOW_POWER;
+	val = ENABLE_LOW_POWER;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
+		val |= VID_MODE_TYPE_BURST_SYNC_PULSES;
+	else if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
+		val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
 
 	dsi_write(dsi, DSI_VID_MODE_CFG, val);
 }
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 24/27] drm/rockchip: vop: test for P{H,V}SYNC

[John Keeping]

When connected to the MIPI DSI output, we need to use N{H,V}SYNC for the
internal connection but these flags are meaningless for DSI panels.
Switch the test so that we do not set the P{H,V}SYNC bits unless the
mode requires it.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index d486049f9722..7c4ce1b2e694 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1030,8 +1030,8 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
 	}
 
 	pin_pol = 0x8;
-	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) ? 0 : 1;
-	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC) ? 0 : (1 << 1);
+	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
+	pin_pol |= (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC) ? (1 << 1) : 0;
 	VOP_CTRL_SET(vop, pin_pol, pin_pol);
 
 	switch (s->output_type) {
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 25/26] drm/rockchip: dw-mipi-dsi: add reset control

[John Keeping]

In order to fully reset the state of the MIPI controller we must assert
this reset.

This is slightly more complicated than it could be in order to maintain
compatibility with device trees that do not specify the reset property.

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index d93e620adea6..d0b2f6e9517d 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
+#include <linux/reset.h>
 #include <linux/mfd/syscon.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
@@ -1134,6 +1135,7 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 			of_match_device(dw_mipi_dsi_dt_ids, dev);
 	const struct dw_mipi_dsi_plat_data *pdata = of_id->data;
 	struct platform_device *pdev = to_platform_device(dev);
+	struct reset_control *apb_rst;
 	struct drm_device *drm = data;
 	struct dw_mipi_dsi *dsi;
 	struct resource *res;
@@ -1172,6 +1174,34 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
 		return ret;
 	}
 
+	/*
+	 * Note that the reset was not defined in the initial device tree, so
+	 * we have to be prepared for it not being found.
+	 */
+	apb_rst = devm_reset_control_get(dev, "apb");
+	if (IS_ERR(apb_rst)) {
+		if (PTR_ERR(apb_rst) == -ENODEV) {
+			apb_rst = NULL;
+		} else {
+			dev_err(dev, "Unable to get reset control: %d\n", ret);
+			return PTR_ERR(apb_rst);
+		}
+	}
+
+	if (apb_rst) {
+		ret = clk_prepare_enable(dsi->pclk);
+		if (ret) {
+			dev_err(dev, "%s: Failed to enable pclk\n", __func__);
+			return ret;
+		}
+
+		reset_control_assert(apb_rst);
+		usleep_range(10, 20);
+		reset_control_deassert(apb_rst);
+
+		clk_disable_unprepare(dsi->pclk);
+	}
+
 	ret = clk_prepare_enable(dsi->pllref_clk);
 	if (ret) {
 		dev_err(dev, "%s: Failed to enable pllref_clk\n", __func__);
-- 
2.10.0.278.g4f427b1.dirty

[PATCH 26/26] drm/rockchip: dw-mipi-dsi: support read commands

[John Keeping]

I haven't found any method for getting the length of a response, so this
just uses the requested rx_len

Signed-off-by: John Keeping <john@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 54 ++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index d0b2f6e9517d..6dc43c024bca 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -676,6 +676,54 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
 	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
 }
 
+static int dw_mipi_dsi_dcs_read(struct dw_mipi_dsi *dsi,
+				const struct mipi_dsi_msg *msg)
+{
+	const u8 *tx_buf = msg->tx_buf;
+	u8 *rx_buf = msg->rx_buf;
+	size_t i;
+	int ret, val;
+
+	dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
+	dsi_write(dsi, DSI_GEN_HDR, GEN_HDATA(tx_buf[0]) | GEN_HTYPE(msg->type));
+
+	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
+				 val, !(val & GEN_RD_CMD_BUSY), 1000,
+				 CMD_PKT_STATUS_TIMEOUT_US);
+	if (ret < 0) {
+		dev_err(dsi->dev, "failed to read command response\n");
+		return ret;
+	}
+
+	for (i = 0; i < msg->rx_len;) {
+		u32 pld = dsi_read(dsi, DSI_GEN_PLD_DATA);
+		while (i < msg->rx_len) {
+			rx_buf[i] = pld & 0xff;
+			pld >>= 8;
+			i++;
+		}
+	}
+
+	return msg->rx_len;
+}
+
+static int dw_mipi_dsi_set_max_return_packet_size(struct dw_mipi_dsi *dsi,
+						  size_t len)
+{
+	u8 val[] = { len & 0xff, (len >> 8) & 0xff };
+	struct mipi_dsi_msg msg = {
+		.channel = dsi->channel,
+		.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
+		.tx_buf = val,
+		.tx_len = 2,
+	};
+
+	if (len > 0xffff)
+		return -EINVAL;
+
+	return dw_mipi_dsi_dcs_short_write(dsi, &msg);
+}
+
 static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 					 const struct mipi_dsi_msg *msg)
 {
@@ -693,6 +741,12 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
 	case MIPI_DSI_DCS_LONG_WRITE:
 		ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
 		break;
+	case MIPI_DSI_DCS_READ:
+		ret = dw_mipi_dsi_set_max_return_packet_size(dsi, msg->rx_len);
+		if (ret < 0)
+			return ret;
+		ret = dw_mipi_dsi_dcs_read(dsi, msg);
+		break;
 	default:
 		dev_err(dsi->dev, "unsupported message type 0x%02x\n",
 			msg->type);
-- 
2.10.0.278.g4f427b1.dirty

Re: [PATCH 00/27] drm/rockchip: MIPI fixes & improvements

[John Keeping]

D'oh, I got send-email horribly wrong here.  Please ignore the n/27
patches following this message - the n/26 versions are correct.

I won't spam the list with a cleaned-up v2 immediately, but I'll make
extra sure to clean out my working directory when I do send the re-roll!

On Mon, 19 Sep 2016 18:17:10 +0100, John Keeping wrote:

> This is a bit of a mixed selection of patches to all areas of the
> Rockchip dw-mipi-dsi driver, which I've been using for a while.
> 
> The first few patches fix the driver's use of the atomic API by removing
> hardware manipulation from the mode_set hook:
> 
>   drm/rockchip: dw-mipi-dsi: use mode from display state
>   drm/rockchip: dw-mipi-dsi: pass new mode into MIPI mode set
>   drm/rockchip: dw-mipi-dsi: don't configure hardware in mode_set for
>     MIPI
>   drm/rockchip: dw-mipi-dsi: rename commit hook to enable
> 
> The following several patches fix various aspects of DSI host transfers
> in order to improve support for displays that need to be set up via DSI
> commands:
> 
>   drm/rockchip: dw-mipi-dsi: fix command header writes
>   drm/rockchip: dw-mipi-dsi: fix generic packet status check
>   drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf
>   drm/rockchip: dw-mipi-dsi: include bad value in error message
>   drm/rockchip: dw-mipi-dsi: respect message flags
>   drm/rockchip: dw-mipi-dsi: only request HS clock when required
>   drm/rockchip: dw-mipi-dsi: don't assume buffer is aligned
>   drm/rockchip: dw-mipi-dsi: prepare panel after phy init
>   drm/rockchip: dw-mipi-dsi: allow commands in panel_disable
> 
> Then a bunch of patches to improve the PHY PLL and other clock setup:
> 
>   drm/rockchip: dw-mipi-dsi: fix escape clock rate
>   drm/rockchip: dw-mipi-dsi: ensure PHY is reset
>   drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable
>   drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured
>   drm/rockchip: dw-mipi-dsi: properly configure PHY timing
>   drm/rockchip: dw-mipi-dsi: improve PLL configuration
> 
> A couple of patches make the VOP and MIPI host consistent when panels do
> not set explicit hsync/vsync polarities:
> 
>   drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC
>   drm/rockchip: vop: test for P{H,V}SYNC
> 
> The following patch fixes fbcon by making sure that the output
> resolution is known before it loads:
> 
>   drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
> 
> Then a patch that should be self-explanatory:
> 
>   drm/rockchip: dw-mipi-dsi: support non-burst modes
> 
> And the final two patches were useful in development but aren't really
> needed once everything's working:
> 
>   drm/rockchip: dw-mipi-dsi: add reset control
>   drm/rockchip: dw-mipi-dsi: support read commands
> 
> 
> John Keeping (26):
>   drm/rockchip: dw-mipi-dsi: use mode from display state
>   drm/rockchip: dw-mipi-dsi: pass new mode into MIPI mode set
>   drm/rockchip: dw-mipi-dsi: don't configure hardware in mode_set for
>     MIPI
>   drm/rockchip: dw-mipi-dsi: rename commit hook to enable
>   drm/rockchip: dw-mipi-dsi: fix command header writes
>   drm/rockchip: dw-mipi-dsi: fix generic packet status check
>   drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf
>   drm/rockchip: dw-mipi-dsi: include bad value in error message
>   drm/rockchip: dw-mipi-dsi: respect message flags
>   drm/rockchip: dw-mipi-dsi: only request HS clock when required
>   drm/rockchip: dw-mipi-dsi: don't assume buffer is aligned
>   drm/rockchip: dw-mipi-dsi: prepare panel after phy init
>   drm/rockchip: dw-mipi-dsi: allow commands in panel_disable
>   drm/rockchip: dw-mipi-dsi: fix escape clock rate
>   drm/rockchip: dw-mipi-dsi: ensure PHY is reset
>   drm/rockchip: dw-mipi-dsi: configure bias and bandgap before enable
>   drm/rockchip: dw-mipi-dsi: don't enable PHY PLL until it's configured
>   drm/rockchip: dw-mipi-dsi: properly configure PHY timing
>   drm/rockchip: dw-mipi-dsi: improve PLL configuration
>   drm/rockchip: dw-mipi-dsi: use specific poll helper
>   drm/rockchip: dw-mipi-dsi: use positive check for N{H,V}SYNC
>   drm/rockchip: vop: test for P{H,V}SYNC
>   drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded
>   drm/rockchip: dw-mipi-dsi: support non-burst modes
>   drm/rockchip: dw-mipi-dsi: add reset control
>   drm/rockchip: dw-mipi-dsi: support read commands
> 
>  drivers/gpu/drm/rockchip/dw-mipi-dsi.c      | 325 ++++++++++++++++++++--------
>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   4 +-
>  2 files changed, 234 insertions(+), 95 deletions(-)
> 

Re: [05/26] drm/rockchip: dw-mipi-dsi: fix command header writes

[Chris Zhong]

same as https://patchwork.kernel.org/patch/9518417/

Tested-by: Chris Zhong <zyw@rock-chips.com>
Reviewed-by: Chris Zhong <zyw@rock-chips.com>

On 09/20/2016 01:17 AM, John Keeping wrote:
> In a couple of places here we use "val" for the value that is about to
> be written to a register but then reuse the same variable for the value
> of a status register before we get around to writing it.  Rename the
> value to be written to so that we write the value we intend to and not
> what we have just read from the status register.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index fac2429b9d6d..03915bf9c97d 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -543,9 +543,10 @@ static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
>   	return 0;
>   }
>   
> -static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 val)
> +static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
>   {
>   	int ret;
> +	u32 val;
>   
>   	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
>   				 val, !(val & GEN_CMD_FULL), 1000,
> @@ -555,7 +556,7 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 val)
>   		return ret;
>   	}
>   
> -	dsi_write(dsi, DSI_GEN_HDR, val);
> +	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
>   
>   	ret = readx_poll_timeout(readl, dsi->base + DSI_CMD_PKT_STATUS,
>   				 val, val & (GEN_CMD_EMPTY | GEN_PLD_W_EMPTY),
> @@ -588,8 +589,9 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
>   {
>   	const u32 *tx_buf = msg->tx_buf;
>   	int len = msg->tx_len, pld_data_bytes = sizeof(*tx_buf), ret;
> -	u32 val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
> +	u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
>   	u32 remainder = 0;
> +	u32 val;
>   
>   	if (msg->tx_len < 3) {
>   		dev_err(dsi->dev, "wrong tx buf length %zu for long write\n",
> @@ -618,7 +620,7 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
>   		}
>   	}
>   
> -	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, val);
> +	return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
>   }
>   
>   static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,

Re: [01/26] drm/rockchip: dw-mipi-dsi: use mode from display state

[Chris Zhong]

On 09/20/2016 01:17 AM, John Keeping wrote:
> There is no need to keep a pointer to the mode around since we know it
> will be present in the connector state.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 31 ++++++++++++++++---------------
>   1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index ca22e5ee89ca..a87037556f5c 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -286,7 +286,6 @@ struct dw_mipi_dsi {
>   	u32 format;
>   	u16 input_div;
>   	u16 feedback_div;
> -	struct drm_display_mode *mode;
>   
>   	const struct dw_mipi_dsi_plat_data *pdata;
>   };
> @@ -332,9 +331,10 @@ static int max_mbps_to_testdin(unsigned int max_mbps)
>    */
>   static void dw_mipi_dsi_wait_for_two_frames(struct dw_mipi_dsi *dsi)
>   {
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   	int refresh, two_frames;
>   
> -	refresh = drm_mode_vrefresh(dsi->mode);
> +	refresh = drm_mode_vrefresh(mode);
>   	two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2;
>   	msleep(two_frames);
>   }
> @@ -461,6 +461,7 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
>   
>   static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
>   {
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   	unsigned int i, pre;
>   	unsigned long mpclk, pllref, tmp;
>   	unsigned int m = 1, n = 1, target_mbps = 1000;
> @@ -474,7 +475,7 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
>   		return bpp;
>   	}
>   
> -	mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC);
> +	mpclk = DIV_ROUND_UP(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;
> @@ -689,9 +690,9 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>   	dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
>   }
>   
> -static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
> -				   struct drm_display_mode *mode)
> +static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
>   {
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   	u32 val = 0, color = 0;
>   
>   	switch (dsi->format) {
> @@ -726,9 +727,10 @@ static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
>   	dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
>   }
>   
> -static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
> -					    struct drm_display_mode *mode)
> +static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi)
>   {
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
> +
>   	dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
>   }
>   
> @@ -744,12 +746,13 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
>   static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
>   					   u32 hcomponent)
>   {
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   	u32 frac, lbcc;
>   
>   	lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
>   
> -	frac = lbcc % dsi->mode->clock;
> -	lbcc = lbcc / dsi->mode->clock;
> +	frac = lbcc % mode->clock;
> +	lbcc = lbcc / mode->clock;
>   	if (frac)
>   		lbcc++;
>   
> @@ -759,7 +762,7 @@ static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
>   static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi)
>   {
>   	u32 htotal, hsa, hbp, lbcc;
> -	struct drm_display_mode *mode = dsi->mode;
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   
>   	htotal = mode->htotal;
>   	hsa = mode->hsync_end - mode->hsync_start;
> @@ -778,7 +781,7 @@ static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi)
>   static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi)
>   {
>   	u32 vactive, vsa, vfp, vbp;
> -	struct drm_display_mode *mode = dsi->mode;
> +	struct drm_display_mode *mode = &dsi->connector.state->crtc->state->adjusted_mode;
>   
>   	vactive = mode->vdisplay;
>   	vsa = mode->vsync_end - mode->vsync_start;
> @@ -821,8 +824,6 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
>   	struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>   	int ret;
>   
> -	dsi->mode = adjusted_mode;
> -
I prefer to keep the original method, although this"dsi->mode" pointer 
is same as "&dsi->connector.state->crtc->state->adjusted_mode; "
I still think dsi->mode makes the process easier to read


>   	ret = dw_mipi_dsi_get_lane_bps(dsi);
>   	if (ret < 0)
>   		return;
> @@ -833,10 +834,10 @@ static void dw_mipi_dsi_encoder_mode_set(struct drm_encoder *encoder,
>   	}
>   
>   	dw_mipi_dsi_init(dsi);
> -	dw_mipi_dsi_dpi_config(dsi, mode);
> +	dw_mipi_dsi_dpi_config(dsi);
>   	dw_mipi_dsi_packet_handler_config(dsi);
>   	dw_mipi_dsi_video_mode_config(dsi);
> -	dw_mipi_dsi_video_packet_config(dsi, mode);
> +	dw_mipi_dsi_video_packet_config(dsi);
>   	dw_mipi_dsi_command_mode_config(dsi);
>   	dw_mipi_dsi_line_timer_config(dsi);
>   	dw_mipi_dsi_vertical_timing_config(dsi);

Re: [01/26] drm/rockchip: dw-mipi-dsi: use mode from display state

[Mark yao]

On 2017年01月17日 18:38, Chris Zhong wrote:
>> @@ -821,8 +824,6 @@ static void dw_mipi_dsi_encoder_mode_set(struct 
>> drm_encoder *encoder,
>>       struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
>>       int ret;
>>   -    dsi->mode = adjusted_mode;
>> -
> I prefer to keep the original method, although this"dsi->mode" pointer 
> is same as "&dsi->connector.state->crtc->state->adjusted_mode; "
> I still think dsi->mode makes the process easier to read
"&dsi->connector.state->crtc->state->adjusted_mode;" is too long, and 
dsi->connector.state->crtc can be NULL, seems not good.

agree with Chris, I think dsi->mode is better.

Bug the origin code "dsi->mode = adjusted_mode; " also has a bug, 
adjusted_mode's lift time is unknown, use a pointer from adjusted_mode 
is dangerous.

I think we can use like that, copy a display mode to dsi->mode:
struct dw_mipi_dsi
{
    -    struct drm_display_mode *mode;
    +    struct drm_display_mode mode;
}
   xxx_encoder_mode_set()
{
    drm_mode_copy(&dsi->mode, adjusted_mode);
}

-- 
Ｍark Yao