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SubjectRe: [RFC PATCH 4/6] drm/msm/dsi: Use DSC slice(s) packet size to compute word count
On 14/12/2022 01:22, Marijn Suijten wrote:
> According to downstream the value to use for WORD_COUNT is
> bytes_per_pkt, which denotes the number of bytes in a packet based on
> how many slices have been configured by the panel driver times the
> width of a slice times the number of bytes per pixel.
> The DSC panels seen thus far use one byte per pixel, only one slice
> per packet, and a slice width of half the panel width leading to the
> desired bytes_per_pkt+1 value to be equal to hdisplay/2+1. This however
> isn't the case anymore for panels that configure two slices per packet,
> where the value should now be hdisplay+1.
> Note that the aforementioned panel (on a Sony Xperia XZ3, sdm845) with
> slice_count=1 has also been tested to successfully accept slice_count=2,
> which would have shown corrupted output previously.
> Fixes: 08802f515c3c ("drm/msm/dsi: Add support for DSC configuration")
> Signed-off-by: Marijn Suijten <>
> ---
> drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Dmitry Baryshkov <>

With best wishes

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