linux-kernel - [PATCH 02/21] drm/msm/dsi: fix DSC width for the bonded DSI case

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Message-Id: <20240829-sm8650-v6-11-hmd-pocf-mdss-quad-upstream-8-v1-2-bdb05b4b5a2e@linaro.org>
Date: Thu, 29 Aug 2024 18:17:31 +0800
From: Jun Nie <jun.nie@...aro.org>
To: 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>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Jun Nie <jun.nie@...aro.org>, Jonathan Marek <jonathan@...ek.ca>
Subject: [PATCH 02/21] drm/msm/dsi: fix DSC width for the bonded DSI case

From: Jonathan Marek <jonathan@...ek.ca>

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.

Bonded DSI can be used to drive a single panel having two input
channels, or to drive two panels with a input channel on every panel that
behave like single panel for display controller.

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
Signed-off-by: Jun Nie <jun.nie@...aro.org>
---
 drivers/gpu/drm/msm/dsi/dsi.h         | 3 ++-
 drivers/gpu/drm/msm/dsi/dsi_host.c    | 6 +++++-
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 87496db203d6c..35b90c462f637 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -79,7 +79,8 @@ 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 6388bb12696ff..7a4d9c071be5a 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -2489,7 +2489,8 @@ 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;
@@ -2499,6 +2500,9 @@ 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 a210b7c9e5ca2..6e915b57e14bb 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -420,7 +420,7 @@ 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 int dsi_mgr_bridge_attach(struct drm_bridge *bridge,

-- 
2.34.1