[PATCH 1/3] drm/amd/display: Disable ips before dc interrupt setting

[Mario Limonciello]

On 1/24/2024 11:09, Roman.Li at amd.com wrote:
> From: Roman Li <Roman.Li at amd.com>
> 
> [Why]
> While in IPS2 an access to dcn registers is not allowed.
> If interrupt results in dc call, we should disable IPS.
> 
> [How]
> Safeguard register access in IPS2 by disabling idle optimization
> before calling dc interrupt setting api.
> 
> Signed-off-by: Roman Li <Roman.Li at amd.com>
> Tested-by: Mark Broadworth <mark.broadworth at amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>
> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
> index 58b880acb087..3390f0d8420a 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
> @@ -711,7 +711,7 @@ static inline int dm_irq_state(struct amdgpu_device *adev,
>   {
>   	bool st;
>   	enum dc_irq_source irq_source;
> -
> +	struct dc *dc = adev->dm.dc;
>   	struct amdgpu_crtc *acrtc = adev->mode_info.crtcs[crtc_id];
>   
>   	if (!acrtc) {
> @@ -729,6 +729,9 @@ static inline int dm_irq_state(struct amdgpu_device *adev,
>   
>   	st = (state == AMDGPU_IRQ_STATE_ENABLE);
>   
> +	if (dc && dc->caps.ips_support && dc->idle_optimizations_allowed)
> +		dc_allow_idle_optimizations(dc, false);
> +
>   	dc_interrupt_set(adev->dm.dc, irq_source, st);
>   	return 0;
>   }