Re: [PATCH] drm/msm/dsi: fix pclk rate calculation for bonded dsi

[Dmitry Baryshkov]

On Sat, Mar 07, 2026 at 12:32:38AM +0800, Pengyu Luo wrote:
> Recently, we round up new_hdisplay once at most, for bonded dsi, we
> may need twice, since they are independent links, we should round up
> each half separately. This also aligns with the hdisplay we program
> later in dsi_timing_setup()
> 
> Example:
> 	full_hdisplay = 1904, dsc_bpp = 8, bpc = 8
> 	new_full_hdisplay = DIV_ROUND_UP(1904 * 8, 8 * 3) = 635
> 
> if we use half display
> 	new_half_hdisplay = DIV_ROUND_UP(952 * 8, 8 * 3) = 318
> 	new_full_display = 636
> 
> Fixes: 7c9e4a554d4a ("drm/msm/dsi: Reduce pclk rate for compression")
> Signed-off-by: Pengyu Luo <mitltlatltl@xxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 29 +++++++++++++++++++++++------
>  1 file changed, 23 insertions(+), 6 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry