linux-kernel - [PATCH 4/4] drm/msm/dsi: fix DSC for the bonded DSI case

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Message-Id: <20231114174218.19765-4-jonathan@marek.ca>
Date:   Tue, 14 Nov 2023 12:42:16 -0500
From:   Jonathan Marek <jonathan@...ek.ca>
To:     freedreno@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Doug Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 4/4] drm/msm/dsi: fix DSC for the bonded DSI case

For the bonded DSI case, DSC pic_width and timing calculations should use
the width of a single panel instead of the total combined width.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/gpu/drm/msm/dsi/dsi.h         |  3 ++-
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 20 +++++++++++---------
 drivers/gpu/drm/msm/dsi/dsi_manager.c |  2 +-
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 28379b1af63f..3a641e69447c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -93,7 +93,8 @@ int msm_dsi_host_power_off(struct mipi_dsi_host *host);
 int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
 				  const struct drm_display_mode *mode);
 enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
-					    const struct drm_display_mode *mode);
+					    const struct drm_display_mode *mode,
+					    bool is_bonded_dsi);
 unsigned long msm_dsi_host_get_mode_flags(struct mipi_dsi_host *host);
 int msm_dsi_host_register(struct mipi_dsi_host *host);
 void msm_dsi_host_unregister(struct mipi_dsi_host *host);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 7284346ab787..a6286eb9d006 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -938,8 +938,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 			       mode->hdisplay, mode->vdisplay);
 			return;
 		}
-
-		dsc->pic_width = mode->hdisplay;
+		dsc->pic_width = hdisplay;
 		dsc->pic_height = mode->vdisplay;
 		DBG("Mode %dx%d\n", dsc->pic_width, dsc->pic_height);
 
@@ -950,6 +949,11 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 		if (ret)
 			return;
 
+		if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO)
+			dsi_update_dsc_timing(msm_host, false, hdisplay);
+		else
+			dsi_update_dsc_timing(msm_host, true, hdisplay);
+
 		/* Divide the display by 3 but keep back/font porch and
 		 * pulse width same
 		 */
@@ -966,9 +970,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 	}
 
 	if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
-		if (msm_host->dsc)
-			dsi_update_dsc_timing(msm_host, false, mode->hdisplay);
-
 		dsi_write(msm_host, REG_DSI_ACTIVE_H,
 			DSI_ACTIVE_H_START(ha_start) |
 			DSI_ACTIVE_H_END(ha_end));
@@ -987,9 +988,6 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
 			DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
 			DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
 	} else {		/* command mode */
-		if (msm_host->dsc)
-			dsi_update_dsc_timing(msm_host, true, mode->hdisplay);
-
 		/* image data and 1 byte write_memory_start cmd */
 		if (!msm_host->dsc)
 			wc = hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
@@ -2487,7 +2485,8 @@ int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
 }
 
 enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
-					    const struct drm_display_mode *mode)
+					    const struct drm_display_mode *mode,
+					    bool is_bonded_dsi)
 {
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
 	struct drm_dsc_config *dsc = msm_host->dsc;
@@ -2497,6 +2496,9 @@ enum drm_mode_status msm_dsi_host_check_dsc(struct mipi_dsi_host *host,
 	if (!msm_host->dsc)
 		return MODE_OK;
 
+	if (is_bonded_dsi)
+		pic_width = mode->hdisplay / 2;
+
 	if (pic_width % dsc->slice_width) {
 		pr_err("DSI: pic_width %d has to be multiple of slice %d\n",
 		       pic_width, dsc->slice_width);
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 896f369fdd53..2ca1a7ca3659 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -455,7 +455,7 @@ static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
 			return MODE_ERROR;
 	}
 
-	return msm_dsi_host_check_dsc(host, mode);
+	return msm_dsi_host_check_dsc(host, mode, IS_BONDED_DSI());
 }
 
 static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
-- 
2.26.1