From: Eric Yang <Eric.Yang2@amd.com>
Date: Fri, 10 Nov 2017 10:44:24 -0500
Subject: drm/amd/display: fix missing pixel clock adjustment for dongle
Git-commit: 78288503199d0a33b69b972a44a4cf15df989899
Patch-mainline: v4.15-rc5
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Andrew Jiang <Andrew.Jiang@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1801,7 +1801,7 @@ static void disable_link(struct dc_link
link->link_enc->funcs->disable_output(link->link_enc, signal, link);
}
-bool dp_active_dongle_validate_timing(
+static bool dp_active_dongle_validate_timing(
const struct dc_crtc_timing *timing,
const struct dc_dongle_caps *dongle_caps)
{
@@ -1833,6 +1833,8 @@ bool dp_active_dongle_validate_timing(
/* Check Color Depth and Pixel Clock */
if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
required_pix_clk /= 2;
+ else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
+ required_pix_clk = required_pix_clk * 2 / 3;
switch (timing->display_color_depth) {
case COLOR_DEPTH_666: