drm/amd/display: fix missing pixel clock adjustment for dongle

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>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 0b7058f..1399589 100644 (file)
--- 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, enum signal_type signal)
                link->link_enc->funcs->disable_output(link->link_enc, signal);
 }
 
-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: