[PATCH 09/20] drm/amd/display: Fill prescale_params->scale for RGB565

[Bhawanpreet Lakha]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]
An assertion is thrown when using SURFACE_PIXEL_FORMAT_GRPH_RGB565
formats on DCE since the prescale_params->scale wasn't being filled.

Found by a dmesg-fail when running the
igt at kms_plane@pixel-format-pipe-a-planes test on Baffin.

[How]
Fill in the scale parameter.

Change-Id: I658250a469c6663bae91bd7afbd2cb9ee75d1ed0
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Reviewed-by: Roman Li <Roman.Li at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 7ac50ab1b762..7d7e93c87c28 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -242,6 +242,9 @@ static void build_prescale_params(struct ipp_prescale_params *prescale_params,
 	prescale_params->mode = IPP_PRESCALE_MODE_FIXED_UNSIGNED;
 
 	switch (plane_state->format) {
+	case SURFACE_PIXEL_FORMAT_GRPH_RGB565:
+		prescale_params->scale = 0x2082;
+		break;
 	case SURFACE_PIXEL_FORMAT_GRPH_ARGB8888:
 	case SURFACE_PIXEL_FORMAT_GRPH_ABGR8888:
 		prescale_params->scale = 0x2020;
-- 
2.17.1