[PATCH 39/43] drm/amd/display: Add WBSCL ram coefficient for writeback

[Roman.Li at amd.com]

From: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dwb.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dwb.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dwb.c
index f8667be57046..80779e85e2c5 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dwb.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dwb.c
@@ -299,6 +299,17 @@ void dwb2_set_scaler(struct dwbc *dwbc, struct dc_dwb_params *params)
 		}
 	}
 
+
+	if (dwbc20->dwbc_mask->WBSCL_COEF_RAM_SEL) {
+		/* Swap double buffered coefficient set */
+		uint32_t wbscl_mode = REG_READ(WBSCL_MODE);
+		bool coef_ram_current = get_reg_field_value_ex(
+			wbscl_mode, dwbc20->dwbc_mask->WBSCL_COEF_RAM_SEL_CURRENT,
+			dwbc20->dwbc_shift->WBSCL_COEF_RAM_SEL_CURRENT);
+
+		REG_UPDATE(WBSCL_MODE, WBSCL_COEF_RAM_SEL, !coef_ram_current);
+	}
+
 }
 
 static const struct dwbc_funcs dcn20_dwbc_funcs = {
-- 
2.34.1