On Tue, Feb 18, 2020 at 04:57:44PM +0100, Torsten Duwe wrote:

drm_dp_link_rate_to_bw_code and ...bw_code_to_link_rate simply divide by and multiply with 27000, respectively. Avoid an overflow in the u8 dpcd[0] and the multiply+divide alltogether.

fixes: ff1e8fb68ea06027 ("analogix-anx78xx: Avoid drm_dp_link helpers") Signed-off-by: Torsten Duwe duwe@suse.de

Since same company I'm assuming Thomas Zimmermann will take care of these patches for you. Or you need to ping maintainers again to push these for you.

Also if you expect to regularlay contribut drm patches, just ask for commit rights after 5-10 patches landed.

Cheers, Daniel

Reviewed-by: Thierry Reding treding@nvidia.com

https://patchwork.freedesktop.org/patch/343003/ (dropped the review mark) https://lists.freedesktop.org/archives/dri-devel/2020-January/253535.html

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diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c index 41867be03751..864423f59d66 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c @@ -722,10 +722,9 @@ static int anx78xx_dp_link_training(struct anx78xx *anx78xx) if (err) return err;

• dpcd[0] = drm_dp_max_link_rate(anx78xx->dpcd);
• dpcd[0] = drm_dp_link_rate_to_bw_code(dpcd[0]); err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],

• 	   SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
  

• 	   SP_DP_MAIN_LINK_BW_SET_REG,
  

• 	   anx78xx->dpcd[DP_MAX_LINK_RATE]);
  

  if (err) return err;