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drm/nouveau/dp: fix required link bandwidth calculations

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2014-07-01 10:54:52 +10:00
parent 028791bb7d
commit 0713b4510e
3 changed files with 11 additions and 9 deletions
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6
drivers/gpu/drm/nouveau/core/engine/disp/nv50.c
View File

@ -1516,11 +1516,11 @@ nv50_disp_intr_unk20_2(struct nv50_disp_priv *priv, int head)
}
switch ((ctrl & 0x000f0000) >> 16) {
case 6: datarate = pclk * 30 / 8; break;
case 5: datarate = pclk * 24 / 8; break;
case 6: datarate = pclk * 30; break;
case 5: datarate = pclk * 24; break;
case 2:
default:
datarate = pclk * 18 / 8;
datarate = pclk * 18;
break;
}

6
drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
View File

@ -1159,11 +1159,11 @@ nvd0_disp_intr_unk2_2(struct nv50_disp_priv *priv, int head)
if (outp->info.type == DCB_OUTPUT_DP) {
u32 sync = nv_rd32(priv, 0x660404 + (head * 0x300));
switch ((sync & 0x000003c0) >> 6) {
case 6: pclk = pclk * 30 / 8; break;
case 5: pclk = pclk * 24 / 8; break;
case 6: pclk = pclk * 30; break;
case 5: pclk = pclk * 24; break;
case 2:
default:
pclk = pclk * 18 / 8;
pclk = pclk * 18;
break;
}

8
drivers/gpu/drm/nouveau/core/engine/disp/outpdp.c
View File

@ -34,7 +34,7 @@ nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
struct nvkm_output_dp *outp = (void *)base;
bool retrain = true;
u8 link[2], stat[3];
u32 rate;
u32 linkrate;
int ret, i;
/* check that the link is trained at a high enough rate */
@ -44,8 +44,10 @@ nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
goto done;
}
rate = link[0] * 27000 * (link[1] & DPCD_LC01_LANE_COUNT_SET);
if (rate < ((datarate / 8) * 10)) {
linkrate = link[0] * 27000 * (link[1] & DPCD_LC01_LANE_COUNT_SET);
linkrate = (linkrate * 8) / 10; /* 8B/10B coding overhead */
datarate = (datarate + 9) / 10; /* -> decakilobits */
if (linkrate < datarate) {
DBG("link not trained at sufficient rate\n");
goto done;
}