From: Sonika Jindal sonika.jindal@intel.com
v2: Reading DP_EDP_REV, only when DISPLAY_CONTROL_CAPABLE field is set (Satheesh)
v3: Moving the utility function to drm_dp_helper (Daniel)
Signed-off-by: Sonika Jindal sonika.jindal@intel.com --- drivers/gpu/drm/drm_dp_helper.c | 15 +++++++++++++++ include/drm/drm_dp_helper.h | 2 ++ 2 files changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 08e33b8..a54a760 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -768,3 +768,18 @@ void drm_dp_aux_unregister(struct drm_dp_aux *aux) i2c_del_adapter(&aux->ddc); } EXPORT_SYMBOL(drm_dp_aux_unregister); + +bool drm_dp_is_edp_v1_4(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + uint8_t reg; + + if (dpcd[DP_EDP_CONFIGURATION_CAP] & + DP_DPCD_DISPLAY_CONTROL_CAPABLE) { + + if (drm_dp_dpcd_read(aux, DP_EDP_REV, ®, 1)) + if (reg == 0x03) + return true; + } + return false; +} +EXPORT_SYMBOL(drm_dp_is_edp_v1_4); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 8edeed0..b017e1e 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -102,6 +102,8 @@
#define DP_EDP_CONFIGURATION_CAP 0x00d /* XXX 1.2? */ #define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* XXX 1.2? */ +#define DP_DPCD_DISPLAY_CONTROL_CAPABLE (1 << 3) +#define DP_EDP_REV 0x700
/* Multiple stream transport */ #define DP_FAUX_CAP 0x020 /* 1.2 */