drm/radeon/kms/atom: force bpc to 8 for now

Using the bpc (bits per color) specified by the monitor
can cause problems in some cases.  Until we get a better
handle on how to deal with those cases, just use a bpc of 8.

Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 083b3ea..b5ff1f7 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -588,8 +588,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                if (encoder->crtc == crtc) {
                        radeon_encoder = to_radeon_encoder(encoder);
                        connector = radeon_get_connector_for_encoder(encoder);
-                       if (connector && connector->display_info.bpc)
-                               bpc = connector->display_info.bpc;
+                       /* if (connector && connector->display_info.bpc)
+                               bpc = connector->display_info.bpc; */
                        encoder_mode = atombios_get_encoder_mode(encoder);
                        is_duallink = radeon_dig_monitor_is_duallink(encoder, mode->clock);
                        if ((radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) ||
@@ -965,7 +965,9 @@ static void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode
                struct radeon_connector_atom_dig *dig_connector =
                        radeon_connector->con_priv;
                int dp_clock;
-               bpc = connector->display_info.bpc;
+
+               /* if (connector->display_info.bpc)
+                       bpc = connector->display_info.bpc; */
 
                switch (encoder_mode) {
                case ATOM_ENCODER_MODE_DP_MST:

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 6c62be2..c57d856 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -405,10 +405,13 @@ static void dp_get_adjust_train(u8 link_status[DP_LINK_STATUS_SIZE],
 /* get bpc from the EDID */
 static int convert_bpc_to_bpp(int bpc)
 {
+#if 0
        if (bpc == 0)
                return 24;
        else
                return bpc * 3;
+#endif
+       return 24;
 }
 
 /* get the max pix clock supported by the link rate and lane num */

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 468b874..e607c4d 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -541,7 +541,7 @@ atombios_dig_encoder_setup(struct drm_encoder *encoder, int action, int panel_mo
                dp_clock = dig_connector->dp_clock;
                dp_lane_count = dig_connector->dp_lane_count;
                hpd_id = radeon_connector->hpd.hpd;
-               bpc = connector->display_info.bpc;
+               /* bpc = connector->display_info.bpc; */
        }
 
        /* no dig encoder assigned */
@@ -1159,7 +1159,7 @@ atombios_external_encoder_setup(struct drm_encoder *encoder,
                dp_lane_count = dig_connector->dp_lane_count;
                connector_object_id =
                        (radeon_connector->connector_object_id & OBJECT_ID_MASK) >> OBJECT_ID_SHIFT;
-               bpc = connector->display_info.bpc;
+               /* bpc = connector->display_info.bpc; */
        }
 
        memset(&args, 0, sizeof(args));