[PATCH v2 4/5] drm/gma500: Use drm_dp_enhanced_frame_cap()

[Dmytro Malovanyi <dmitrymalovanyy@gmail.com>]

Use the helper instead of open coding the check, so enhanced framing is
used for all DPCD r1.2+ sinks as the spec requires.

The helper takes DP_RECEIVER_CAP_SIZE bytes and gcc warns about reading
past dpcd[4] (-Wstringop-overread), so read the full receiver caps like
the other drivers do. That is 15 bytes, it fits in one AUX transfer.

Compile tested only.

Signed-off-by: Dmytro Malovanyi <dmitrymalovanyy@gmail.com>
---
 drivers/gpu/drm/gma500/cdv_intel_dp.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/gma500/cdv_intel_dp.c b/drivers/gpu/drm/gma500/cdv_intel_dp.c
index 8d0626ddf..0973598c7 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_dp.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_dp.c
@@ -262,7 +262,7 @@ struct cdv_intel_dp {
 	uint32_t color_range;
 	uint8_t link_bw;
 	uint8_t lane_count;
-	uint8_t dpcd[4];
+	uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
 	struct gma_encoder *encoder;
 	struct i2c_adapter adapter;
 	struct i2c_algo_dp_aux_data algo;
@@ -1070,11 +1070,7 @@ cdv_intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode
 	intel_dp->link_configuration[0] = intel_dp->link_bw;
 	intel_dp->link_configuration[1] = intel_dp->lane_count;
 
-	/*
-	 * Check for DPCD version > 1.1 and enhanced framing support
-	 */
-	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
-	    (intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) {
+	if (drm_dp_enhanced_frame_cap(intel_dp->dpcd)) {
 		intel_dp->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 		intel_dp->DP |= DP_ENHANCED_FRAMING;
 	}
-- 
2.50.1 (Apple Git-155)