From: Thierry Reding treding@nvidia.com
If the sink support eDP, read the eDP revision from it's DPCD.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_dp_helper.c | 30 +++++++++++++++++++++++++++++- include/drm/drm_dp_helper.h | 1 + 2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 1fe181525604..c711b690508b 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -295,7 +295,7 @@ EXPORT_SYMBOL(drm_dp_dpcd_read_link_status); */ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) { - u8 values[7]; + u8 values[16], value; int err;
memset(link, 0, sizeof(*link)); @@ -323,6 +323,34 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) if (values[6] & DP_SET_ANSI_8B10B) link->capabilities |= DP_LINK_CAP_ANSI_8B10B;
+ if (values[13] & DP_ALTERNATE_SCRAMBLER_RESET_CAP) { + err = drm_dp_dpcd_readb(aux, DP_EDP_DPCD_REV, &value); + if (err < 0) + return err; + + switch (value) { + case DP_EDP_11: + link->edp = 0x11; + break; + + case DP_EDP_12: + link->edp = 0x12; + break; + + case DP_EDP_13: + link->edp = 0x13; + break; + + case DP_EDP_14: + link->edp = 0x14; + break; + + default: + DRM_ERROR("unsupported eDP version: %02x\n", value); + break; + } + } + return 0; } EXPORT_SYMBOL(drm_dp_link_probe); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 9e70ea8b907d..f9e7f484a225 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -749,6 +749,7 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
struct drm_dp_link { unsigned char revision; + unsigned char edp; unsigned int rate; unsigned int num_lanes; unsigned long capabilities;