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drm/nouveau/disp: semi-complete link training sequence even if display disappears

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2013-11-04 13:40:36 +10:00
parent 4767fae8f8
commit 8df1d0c07f
1 changed files with 32 additions and 16 deletions
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48
drivers/gpu/drm/nouveau/core/engine/disp/dport.c
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@ -70,17 +70,10 @@ dp_set_link_config(struct dp_state *dp)
};
u32 lnkcmp;
u8 sink[2];
int ret;
DBG("%d lanes at %d KB/s\n", dp->link_nr, dp->link_bw);
/* set desired link configuration on the sink */
sink[0] = dp->link_bw / 27000;
sink[1] = dp->link_nr;
if (dp->dpcd[DPCD_RC02] & DPCD_RC02_ENHANCED_FRAME_CAP)
sink[1] |= DPCD_LC01_ENHANCED_FRAME_EN;
nv_wraux(dp->aux, DPCD_LC00, sink, 2);
/* set desired link configuration on the source */
if ((lnkcmp = dp->info.lnkcmp)) {
if (dp->version < 0x30) {
@ -96,10 +89,22 @@ dp_set_link_config(struct dp_state *dp)
nvbios_exec(&init);
}
return dp->func->lnk_ctl(dp->disp, dp->outp, dp->head,
dp->link_nr, dp->link_bw / 27000,
dp->dpcd[DPCD_RC02] &
DPCD_RC02_ENHANCED_FRAME_CAP);
ret = dp->func->lnk_ctl(dp->disp, dp->outp, dp->head,
dp->link_nr, dp->link_bw / 27000,
dp->dpcd[DPCD_RC02] &
DPCD_RC02_ENHANCED_FRAME_CAP);
if (ret) {
ERR("lnk_ctl failed with %d\n", ret);
return ret;
}
/* set desired link configuration on the sink */
sink[0] = dp->link_bw / 27000;
sink[1] = dp->link_nr;
if (dp->dpcd[DPCD_RC02] & DPCD_RC02_ENHANCED_FRAME_CAP)
sink[1] |= DPCD_LC01_ENHANCED_FRAME_EN;
return nv_wraux(dp->aux, DPCD_LC00, sink, 2);
}
static void
@ -294,8 +299,17 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
ret = nv_rdaux(dp->aux, 0x00000, dp->dpcd, sizeof(dp->dpcd));
if (ret) {
/* it's possible the display has been unplugged before we
* get here. we still need to execute the full set of
* vbios scripts, and program the OR at a high enough
* frequency to satisfy the target mode. failure to do
* so results at best in an UPDATE hanging, and at worst
* with PDISP running away to join the circus.
*/
dp->dpcd[1] = link_bw[0] / 27000;
dp->dpcd[2] = 4;
dp->dpcd[3] = 0x00;
ERR("failed to read DPCD\n");
return ret;
}
/* adjust required bandwidth for 8B/10B coding overhead */
@ -328,8 +342,10 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
!dp_link_train_eq(dp))
break;
} else
if (ret >= 1) {
/* dp_set_link_config() handled training */
if (ret) {
/* dp_set_link_config() handled training, or
* we failed to communicate with the sink.
*/
break;
}
@ -344,5 +360,5 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
/* execute post-train script from vbios */
dp_link_train_fini(dp);
return true;
return (ret < 0) ? false : true;
}