[Intel-gfx] [PATCH] drm/i915: disable DMC idle states for Intel UHD Graphics 620

[Jani Nikula]

On Fri, 11 Nov 2022, "Steven 'Steve' Kendall" <skend at chromium.org> wrote:
> Some machines with Intel UHD Graphics 620 (8086:5917) such as Dell
> Latitude 7490 are unable to wake from sleep. Disable DMC for
> Intel UHD Graphics 620.

Cc: some more folks

The patch at hand seems like too heavy a hammer. But this needs
attention.

BR,
Jani.



>
> Link: https://gitlab.freedesktop.org/drm/intel/-/issues/7339
> Signed-off-by: Steven 'Steve' Kendall <skend at google.com>
> ---
>  drivers/gpu/drm/i915/i915_pci.c | 14 ++++++++++++++
>  include/drm/i915_pciids.h       |  6 +++++-
>  2 files changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index cd4487a1d3be..ea148be46b14 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -697,6 +697,10 @@ static const struct intel_device_info skl_gt4_info = {
>  	.gt = 4,
>  };
>  
> +#define GEN9_DMCLESS_FEATURES \
> +	GEN9_FEATURES, \
> +	.__runtime.has_dmc = 0
> +
>  #define GEN9_LP_FEATURES \
>  	GEN(9), \
>  	.is_lp = 1, \
> @@ -753,6 +757,10 @@ static const struct intel_device_info glk_info = {
>  	GEN9_FEATURES, \
>  	PLATFORM(INTEL_KABYLAKE)
>  
> +#define KBL_DMCLESS_PLATFORM \
> +	GEN9_DMCLESS_FEATURES, \
> +	PLATFORM(INTEL_KABYLAKE)
> +
>  static const struct intel_device_info kbl_gt1_info = {
>  	KBL_PLATFORM,
>  	.gt = 1,
> @@ -763,6 +771,11 @@ static const struct intel_device_info kbl_gt2_info = {
>  	.gt = 2,
>  };
>  
> +static const struct intel_device_info dmcless_kbl_gt2_info = {
> +	KBL_DMCLESS_PLATFORM,
> +	.gt = 2,
> +};
> +
>  static const struct intel_device_info kbl_gt3_info = {
>  	KBL_PLATFORM,
>  	.gt = 3,
> @@ -1202,6 +1215,7 @@ static const struct pci_device_id pciidlist[] = {
>  	INTEL_GLK_IDS(&glk_info),
>  	INTEL_KBL_GT1_IDS(&kbl_gt1_info),
>  	INTEL_KBL_GT2_IDS(&kbl_gt2_info),
> +	DMCLESS_INTEL_KBL_GT2_IDS(&dmcless_kbl_gt2_info),
>  	INTEL_KBL_GT3_IDS(&kbl_gt3_info),
>  	INTEL_KBL_GT4_IDS(&kbl_gt3_info),
>  	INTEL_AML_KBL_GT2_IDS(&kbl_gt2_info),
> diff --git a/include/drm/i915_pciids.h b/include/drm/i915_pciids.h
> index 4a4c190f7698..93bea60772ff 100644
> --- a/include/drm/i915_pciids.h
> +++ b/include/drm/i915_pciids.h
> @@ -420,11 +420,15 @@
>  	INTEL_KBL_ULT_GT2_IDS(info), \
>  	INTEL_KBL_ULX_GT2_IDS(info), \
>  	INTEL_VGA_DEVICE(0x5912, info), /* DT  GT2 */ \
> -	INTEL_VGA_DEVICE(0x5917, info), /* Mobile GT2 */ \
>  	INTEL_VGA_DEVICE(0x591A, info), /* SRV GT2 */ \
>  	INTEL_VGA_DEVICE(0x591B, info), /* Halo GT2 */ \
>  	INTEL_VGA_DEVICE(0x591D, info) /* WKS GT2 */
>  
> +#define DMCLESS_INTEL_KBL_GT2_IDS(info) \
> +	INTEL_KBL_ULT_GT2_IDS(info), \
> +	INTEL_KBL_ULX_GT2_IDS(info), \
> +	INTEL_VGA_DEVICE(0x5917, info) /* Mobile GT2 */
> +
>  #define INTEL_KBL_ULT_GT3_IDS(info) \
>  	INTEL_VGA_DEVICE(0x5926, info) /* ULT GT3 */

-- 
Jani Nikula, Intel Open Source Graphics Center