Commit 3ce51649 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/amdgpu/display: add quirk handling for stutter mode 

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: 00544006 ("drm/amdgpu: enable gfxoff again on raven series (v2)")
Reviewed-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 3d1a8d95

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

+33 −0
Original line number Diff line number Diff line
@@ -1295,6 +1295,37 @@ 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;
@@ -1406,6 +1437,8 @@ 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;