[PATCH 07/11] drm/dp: Add drm_dp_uhbr_channel_coding_supported()

[Imre Deak]

Factor out a function to check for UHBR channel coding support used by a
follow-up patch in the patchset.

Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
 include/drm/display/drm_dp_helper.h     | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index dbe65651bf277..1d13a1ba2b97d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -217,7 +217,7 @@ static void intel_dp_set_dpcd_sink_rates(struct intel_dp *intel_dp)
 	 * Sink rates for 128b/132b. If set, sink should support all 8b/10b
 	 * rates and 10 Gbps.
 	 */
-	if (intel_dp->dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B) {
+	if (drm_dp_uhbr_channel_coding_supported(intel_dp->dpcd)) {
 		u8 uhbr_rates = 0;
 
 		BUILD_BUG_ON(ARRAY_SIZE(intel_dp->sink_rates) < ARRAY_SIZE(dp_rates) + 3);
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
index a62fcd051d4d4..150c37a99a16f 100644
--- a/include/drm/display/drm_dp_helper.h
+++ b/include/drm/display/drm_dp_helper.h
@@ -221,6 +221,12 @@ drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 	return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B;
 }
 
+static inline bool
+drm_dp_uhbr_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+	return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B;
+}
+
 static inline bool
 drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 {
-- 
2.43.3