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

[Jun Nie]

From: Jonathan Marek <jonat...@marek.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 <jonat...@marek.ca>
Signed-off-by: Jun Nie <jun....@linaro.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