[PATCH 3/7] drm/amd/display: use drm_dsc_dp_rc_buffer_size() to get rc buffer size

[Jani Nikula]

Use the new drm_dsc_dp_rc_buffer_size() helper to simplify rc buffer
size computation. No functional changes.

Cc: Alex Deucher <alexdeucher at gmail.com>
Cc: Harry Wentland <hwentlan at amd.com>
Cc: Manasi Navare <manasi.d.navare at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 37 ++++-----------------
 1 file changed, 7 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
index 8b78fcbfe746..6dcfe049e5b8 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -85,31 +85,6 @@ static uint32_t dc_dsc_bandwidth_in_kbps_from_timing(
 
 }
 
-static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size)
-{
-
-	switch (dpcd_buff_block_size) {
-	case DP_DSC_RC_BUF_BLK_SIZE_1:
-		*buff_block_size = 1024;
-		break;
-	case DP_DSC_RC_BUF_BLK_SIZE_4:
-		*buff_block_size = 4 * 1024;
-		break;
-	case DP_DSC_RC_BUF_BLK_SIZE_16:
-		*buff_block_size = 16 * 1024;
-		break;
-	case DP_DSC_RC_BUF_BLK_SIZE_64:
-		*buff_block_size = 64 * 1024;
-		break;
-	default: {
-			dm_error("%s: DPCD DSC buffer size not recognized.\n", __func__);
-			return false;
-		}
-	}
-
-	return true;
-}
-
 
 static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth)
 {
@@ -772,14 +747,16 @@ bool dc_dsc_parse_dsc_dpcd(const struct dc *dc, const uint8_t *dpcd_dsc_basic_da
 	dsc_sink_caps->dsc_version = dpcd_dsc_basic_data[DP_DSC_REV - DP_DSC_SUPPORT];
 
 	{
-		int buff_block_size;
-		int buff_size;
+		u8 buff_block_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT];
+		u8 buff_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT];
+		int size = drm_dsc_dp_rc_buffer_size(buff_block_size, buff_size);
 
-		if (!dsc_buff_block_size_from_dpcd(dpcd_dsc_basic_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT], &buff_block_size))
+		if (!size) {
+			dm_error("%s: DPCD DSC buffer size not recognized.\n", __func__);
 			return false;
+		}
 
-		buff_size = dpcd_dsc_basic_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT] + 1;
-		dsc_sink_caps->rc_buffer_size = buff_size * buff_block_size;
+		dsc_sink_caps->rc_buffer_size = size;
 	}
 
 	dsc_sink_caps->slice_caps1.raw = dpcd_dsc_basic_data[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
-- 
2.20.1