lkml.org 
[lkml]   [2023]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] drm/amd/display: use a more accurate check in dm_helpers_dp_read_dpcd()
From


On 3/9/23 14:30, Hamza Mahfooz wrote:
> We should be checking if drm_dp_dpcd_read() returns the size that we are
> asking it to read instead of just checking if it is greater than zero.
> Also, we should WARN_ON() here since this condition is only ever met, if
> there is an issue worth investigating. So, compare the return value of
> drm_dp_dpcd_read() to size and WARN_ON() if they aren't equal.
>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index 8d598b322e5b..ed2ed7b1d869 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -511,8 +511,8 @@ bool dm_helpers_dp_read_dpcd(
> return false;
> }
>
> - return drm_dp_dpcd_read(&aconnector->dm_dp_aux.aux, address,
> - data, size) > 0;
> + return !WARN_ON(drm_dp_dpcd_read(&aconnector->dm_dp_aux.aux, address,
> + data, size) != size);
> }
>
> bool dm_helpers_dp_write_dpcd(


Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>

and pushed to amd-staging-drm-next.

Thanks
Siqueira

\
 
 \ /
  Last update: 2023-03-27 00:53    [W:0.054 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site