[PATCH v6 6/7] drm/msm/dsi: update hdisplay calculation for dsi_timing_setup

[Marijn Suijten]

On 2023-05-04 15:05:15, Abhinav Kumar wrote:
> 
> 
> On 5/4/2023 2:56 PM, Marijn Suijten wrote:
> > On 2023-04-12 16:25:20, Jessica Zhang wrote:
> >> hdisplay for compressed images should be calculated as bytes_per_slice *
> >> slice_count. Thus, use MSM DSC helper to calculate hdisplay for
> >> dsi_timing_setup instead of directly using mode->hdisplay.
> >>
> >> Changes in v3:
> >> - Split from previous patch
> >> - Initialized hdisplay as uncompressed pclk per line at the beginning of
> >>    dsi_timing_setup as to not break dual DSI calculations
> >>
> >> Changes in v4:
> >> - Moved pclk_per_intf calculations to DSC hdisplay adjustments
> >>
> >> Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
> >> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> >> ---
> >>   drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> index 508577c596ff..ae966d4e349d 100644
> >> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> >> @@ -952,7 +952,7 @@ static void dsi_timing_setup(struct msm_dsi_host *msm_host, bool is_bonded_dsi)
> >>   		 * pulse width same
> >>   		 */
> >>   		h_total -= hdisplay;
> >> -		hdisplay /= 3;
> >> +		hdisplay = msm_dsc_get_pclk_per_intf(msm_host->dsc) / 3;
> > 
> > This patch is unfortunately regressing the Sony Xperia XZ3 (sdm845,
> > single DSI), which will only show garbage when it is applied.
> > 
> > Are you sure this is correct, and the helper is returning the right
> > values?  I'll see if I can help review and validate those later, and
> > debug if necessary.
> > 
> > - Marijn
> 
> To help us debug these kind of issues, can you pls point us to your 
> panel driver?

https://github.com/SoMainline/linux/commit/b154ea72e6c2ca0d4a33a28cc24e3a762dba4948

- Marijn