Re: [PATCH 0/5] drm: Fix math issues in MSM DSC implementation

From: Vinod Koul
Date: Tue Oct 04 2022 - 00:43:12 EST

On 01-10-22, 21:08, Marijn Suijten wrote:
> Various removals of complex yet unnecessary math, fixing all uses of
> drm_dsc_config::bits_per_pixel to deal with the fact that this field
> includes four fractional bits, and finally an approach for dealing with
> dsi_host setting negative values in range_bpg_offset, resulting in
> overflow inside drm_dsc_pps_payload_pack().
> Note that updating the static bpg_offset array to limit the size of
> these negative values to 6 bits changes what would be written to the DPU
> hardware at register(s) DSC_RANGE_BPG_OFFSET, hence the choice has been
> made to cover up for this while packing the value into a smaller field
> instead.

Thanks for fixing these. I dont have my pixel3 availble but changes lgtm

Reviewed-by: Vinod Koul <vkoul@xxxxxxxxxx>

> Altogether this series is responsible for solving _all_ Display Stream
> Compression issues and artifacts on the Sony Tama (sdm845) Akatsuki
> smartphone (2880x1440p).

Does it need two dsi lanes?