[PATCH v2 6/6] drm/msm/dsi: fix DSC for the bonded DSI case

Jonathan Marek
2023-11-14T23:01:06Z

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@marek.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 892a463a7e03..cf06736e5a60 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -940,8 +940,7 @@ 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);

@@ -952,6 +951,11 @@ 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
*/
@@ -968,9 +972,6 @@ 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));
@@ -989,9 +990,6 @@ 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;
@@ -2479,7 +2477,8 @@ 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;
@@ -2489,6 +2488,9 @@ 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