diff options
| author | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2025-03-24 13:51:20 +0200 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> | 2025-03-25 16:20:38 +0200 |
| commit | fcbb93f1e48a150159534a1e6ec19e6fdf9196df (patch) | |
| tree | 868ecce57ad02f36054fdf7cce17cb5cf2eca4dc /drivers/gpu/drm/display/drm_dp_helper.c | |
| parent | d8343e115658fb35115e0720f4761ffa0147329a (diff) | |
drm/display: dp: change drm_dp_dpcd_read_link_status() return value
drm_dp_dpcd_read_link_status() follows the "return error code or number
of bytes read" protocol, with the code returning less bytes than
requested in case of some errors. However most of the drivers
interpreted that as "return error code in case of any error". Switch
drm_dp_dpcd_read_link_status() to drm_dp_dpcd_read_data() and make it
follow that protocol too.
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20250324-drm-rework-dpcd-access-v4-2-e80ff89593df@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Diffstat (limited to 'drivers/gpu/drm/display/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index e43a8f4a252d..410be0be233a 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -778,14 +778,13 @@ EXPORT_SYMBOL(drm_dp_dpcd_write); * @aux: DisplayPort AUX channel * @status: buffer to store the link status in (must be at least 6 bytes) * - * Returns the number of bytes transferred on success or a negative error - * code on failure. + * Returns a negative error code on failure or 0 on success. */ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]) { - return drm_dp_dpcd_read(aux, DP_LANE0_1_STATUS, status, - DP_LINK_STATUS_SIZE); + return drm_dp_dpcd_read_data(aux, DP_LANE0_1_STATUS, status, + DP_LINK_STATUS_SIZE); } EXPORT_SYMBOL(drm_dp_dpcd_read_link_status); |