From ad5ae54528af26e1a02c7c5d1b57a1d9fc83368e Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Wed, 25 May 2022 10:57:49 -0400
Subject: drm/panfrost: Handle HW_ISSUE_TTRX_3076
Git-commit: 0c0af438345ebe5477720f07216c7e48f6f88756
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
Some Valhall GPUs require resets when encountering bus faults due to
occlusion query writes. Add the issue bit for this and handle it.
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220525145754.25866-5-alyssa.rosenzweig@collabora.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/panfrost/panfrost_device.c | 9 +++++++--
drivers/gpu/drm/panfrost/panfrost_issues.h | 4 ++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 7f51a4682ccb..ee612303f076 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -11,6 +11,7 @@
#include "panfrost_device.h"
#include "panfrost_devfreq.h"
#include "panfrost_features.h"
+#include "panfrost_issues.h"
#include "panfrost_gpu.h"
#include "panfrost_job.h"
#include "panfrost_mmu.h"
@@ -380,9 +381,13 @@ const char *panfrost_exception_name(u32 exception_code)
bool panfrost_exception_needs_reset(const struct panfrost_device *pfdev,
u32 exception_code)
{
- /* Right now, none of the GPU we support need a reset, but this
- * might change.
+ /* If an occlusion query write causes a bus fault on affected GPUs,
+ * future fragment jobs may hang. Reset to workaround.
*/
+ if (exception_code == DRM_PANFROST_EXCEPTION_JOB_BUS_FAULT)
+ return panfrost_has_hw_issue(pfdev, HW_ISSUE_TTRX_3076);
+
+ /* No other GPUs we support need a reset */
return false;
}
diff --git a/drivers/gpu/drm/panfrost/panfrost_issues.h b/drivers/gpu/drm/panfrost/panfrost_issues.h
index 14670ee58ace..e35807e4b743 100644
--- a/drivers/gpu/drm/panfrost/panfrost_issues.h
+++ b/drivers/gpu/drm/panfrost/panfrost_issues.h
@@ -128,6 +128,10 @@ enum panfrost_hw_issue {
/* Must set SC_VAR_ALGORITHM */
HW_ISSUE_TTRX_2968_TTRX_3162,
+ /* Bus fault from occlusion query write may cause future fragment jobs
+ * to hang */
+ HW_ISSUE_TTRX_3076,
+
HW_ISSUE_END
};
--
2.38.1