[PATCH 5.15 045/201] drm/amdgpu/display: add quirk handling for stutter mode

Greg Kroah-Hartman
2022-07-27T17:04:56Z

From: Alex Deucher <alexander.deucher@amd.com>

[ Upstream commit 3ce51649cdf23ab463494df2bd6d1e9529ebdc6a ]

Stutter mode is a power saving feature on GPUs, however at
least one early raven system exhibits stability issues with
it. Add a quirk to disable it for that system.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214417
Fixes: 005440066f929b ("drm/amdgpu: enable gfxoff again on raven series (v2)")
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 33 +++++++++++++++++++
1 file changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index ce647302a1ec..873cb0051952 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1313,6 +1313,37 @@ static struct hpd_rx_irq_offload_work_queue *hpd_rx_irq_create_workqueue(struct
return hpd_rx_offload_wq;
}

+struct amdgpu_stutter_quirk {
+ u16 chip_vendor;
+ u16 chip_device;
+ u16 subsys_vendor;
+ u16 subsys_device;
+ u8 revision;
+};
+
+static const struct amdgpu_stutter_quirk amdgpu_stutter_quirk_list[] = {
+ /* https://bugzilla.kernel.org/show_bug.cgi?id=214417 */
+ { 0x1002, 0x15dd, 0x1002, 0x15dd, 0xc8 },
+ { 0, 0, 0, 0, 0 },
+};
+
+static bool dm_should_disable_stutter(struct pci_dev *pdev)
+{
+ const struct amdgpu_stutter_quirk *p = amdgpu_stutter_quirk_list;
+
+ while (p && p->chip_device != 0) {
+ if (pdev->vendor == p->chip_vendor &&
+ pdev->device == p->chip_device &&
+ pdev->subsystem_vendor == p->subsys_vendor &&
+ pdev->subsystem_device == p->subsys_device &&
+ pdev->revision == p->revision) {
+ return true;
+ }
+ ++p;
+ }
+ return false;
+}
+
static int amdgpu_dm_init(struct amdgpu_device *adev)
{
struct dc_init_data init_data;
@@ -1421,6 +1452,8 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)

if (adev->asic_type != CHIP_CARRIZO && adev->asic_type != CHIP_STONEY)
adev->dm.dc->debug.disable_stutter = amdgpu_pp_feature_mask & PP_STUTTER_MODE ? false : true;
+ if (dm_should_disable_stutter(adev->pdev))
+ adev->dm.dc->debug.disable_stutter = true;

if (amdgpu_dc_debug_mask & DC_DISABLE_STUTTER)
adev->dm.dc->debug.disable_stutter = true;
--
2.35.1