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[02/11] drm/i915: Read the EDP DPCD and PSR Capability

Message ID 1372283722-12988-2-git-send-email-rodrigo.vivi@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Rodrigo Vivi June 26, 2013, 9:55 p.m. UTC 
From: Shobhit Kumar <shobhit.kumar@intel.com>

v2: reuse of just created is_edp_psr and put it at right place.
v3: move is_edp_psr above intel_edp_disable

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
---
 drivers/gpu/drm/i915/intel_dp.c  | 13 +++++++++++++
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 2 files changed, 14 insertions(+)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 24a44ed..709e9d9 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1342,6 +1342,12 @@  static void intel_dp_get_config(struct intel_encoder *encoder,
 	pipe_config->adjusted_mode.flags |= flags;
 }
 
+static bool is_edp_psr(struct intel_dp *intel_dp)
+{
+	return (is_edp(intel_dp) &&
+		(intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED));
+}
+
 static void intel_disable_dp(struct intel_encoder *encoder)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
@@ -2255,6 +2261,13 @@  intel_dp_get_dpcd(struct intel_dp *intel_dp)
 	if (intel_dp->dpcd[DP_DPCD_REV] == 0)
 		return false; /* DPCD not present */
 
+	/* Check if the panel supports PSR */
+	memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd));
+	intel_dp_aux_native_read_retry(intel_dp, DP_PSR_SUPPORT,
+				       intel_dp->psr_dpcd,
+				       sizeof(intel_dp->psr_dpcd));
+	if (is_edp_psr(intel_dp))
+		DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
 	if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
 	      DP_DWN_STRM_PORT_PRESENT))
 		return true; /* native DP sink */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c5b463c..9b264ee 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -486,6 +486,7 @@  struct intel_dp {
 	uint8_t link_bw;
 	uint8_t lane_count;
 	uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
+	uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE];
 	uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
 	struct i2c_adapter adapter;
 	struct i2c_algo_dp_aux_data algo;