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

[Marijn Suijten]

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.

This doesn't really matter in the common case of of bpp=8, as the number
of horizontal pixels is equal to the number of horizontal slices times
the width of one horizontal slice.

> 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 function sounds like it returns bytes_per_line instead, not the
number of pixels in case bpp!=8.  Should we rename it?

- Marijn

>  		h_total += hdisplay;
>  		ha_end = ha_start + hdisplay;
>  	}
> 
> -- 
> 2.40.0
>