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drm/nouveau/disp: activate dual link TMDS links only when possible

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Without this patch a pixel clock rate above 165 MHz on a TMDS link is
assumed to be dual link. This is true for DVI, but not for HDMI. HDMI
supports no dual link, but it supports pixel clock rates above 165 MHz.
Only activate Dual Link mode when it is actually possible and requested.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
[imirkin: check for hdmi monitor for computing proto, use sor ctrl to
 enable extra config bit]
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Hauke Mehrtens 2015-11-03 21:00:10 -05:00 committed by Ben Skeggs
parent c11b898963
commit 16ef53a93c
3 changed files with 13 additions and 6 deletions
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15
drivers/gpu/drm/nouveau/nv50_display.c
View File

@ -1962,10 +1962,17 @@ nv50_sor_mode_set(struct drm_encoder *encoder, struct drm_display_mode *umode,
switch (nv_encoder->dcb->type) {
case DCB_OUTPUT_TMDS:
if (nv_encoder->dcb->sorconf.link & 1) {
if (mode->clock < 165000)
proto = 0x1;
else
proto = 0x5;
proto = 0x1;
/* Only enable dual-link if:
* - Need to (i.e. rate > 165MHz)
* - DCB says we can
* - Not an HDMI monitor, since there's no dual-link
* on HDMI.
*/
if (mode->clock >= 165000 &&
nv_encoder->dcb->duallink_possible &&
!drm_detect_hdmi_monitor(nv_connector->edid))
proto |= 0x4;
} else {
proto = 0x2;
}

2
drivers/gpu/drm/nouveau/nvkm/engine/disp/gf119.c
View File

@ -158,7 +158,7 @@ exec_clkcmp(struct nv50_disp *disp, int head, int id, u32 pclk, u32 *conf)
switch (outp->info.type) {
case DCB_OUTPUT_TMDS:
*conf = (ctrl & 0x00000f00) >> 8;
if (pclk >= 165000)
if (*conf == 5)
*conf |= 0x0100;
break;
case DCB_OUTPUT_LVDS:

2
drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
View File

@ -391,7 +391,7 @@ exec_clkcmp(struct nv50_disp *disp, int head, int id, u32 pclk, u32 *conf)
switch (outp->info.type) {
case DCB_OUTPUT_TMDS:
*conf = (ctrl & 0x00000f00) >> 8;
if (pclk >= 165000)
if (*conf == 5)
*conf |= 0x0100;
break;
case DCB_OUTPUT_LVDS: