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drm/nouveau/disp: power down unused DP links during init 

[ Upstream commit 6eaa1f3c59a707332e921e32782ffcad49915c5e ]

When booted with multiple displays attached, the EFI GOP driver on (at
least) Ampere, can leave DP links powered up that aren't being used to
display anything.  This confuses our tracking of SOR routing, with the
likely result being a failed modeset and display engine hang.

Fix this by (ab?)using the DisableLT IED script to power-down the link,
restoring HW to a state the driver expects.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ben Skeggs 2021-08-09 16:40:48 +10:00 committed by Greg Kroah-Hartman
parent 689179c462
commit ad6a2bc758
3 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -419,7 +419,7 @@ nvkm_dp_train(struct nvkm_dp *dp, u32 dataKBps)
return ret;
}
static void
void
nvkm_dp_disable(struct nvkm_outp *outp, struct nvkm_ior *ior)
{
struct nvkm_dp *dp = nvkm_dp(outp);

1
drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.h
View File

@ -32,6 +32,7 @@ struct nvkm_dp {
int nvkm_dp_new(struct nvkm_disp *, int index, struct dcb_output *,
struct nvkm_outp **);
void nvkm_dp_disable(struct nvkm_outp *, struct nvkm_ior *);
/* DPCD Receiver Capabilities */
#define DPCD_RC00_DPCD_REV 0x00000

9
drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
View File

@ -22,6 +22,7 @@
* Authors: Ben Skeggs
*/
#include "outp.h"
#include "dp.h"
#include "ior.h"
#include <subdev/bios.h>
@ -216,6 +217,14 @@ nvkm_outp_init_route(struct nvkm_outp *outp)
if (!ior->arm.head || ior->arm.proto != proto) {
OUTP_DBG(outp, "no heads (%x %d %d)", ior->arm.head,
ior->arm.proto, proto);
/* The EFI GOP driver on Ampere can leave unused DP links routed,
* which we don't expect. The DisableLT IED script *should* get
* us back to where we need to be.
*/
if (ior->func->route.get && !ior->arm.head && outp->info.type == DCB_OUTPUT_DP)
nvkm_dp_disable(outp, ior);
return;
}