Re: [Intel-gfx] [PATCH v8 5/8] drm/i915: Add dedicated plane hook for async flip case

[Karthik B S <karthik.b.s@intel.com>]

On 9/15/2020 7:40 PM, Ville Syrjälä wrote:
> On Mon, Sep 14, 2020 at 11:26:30AM +0530, Karthik B S wrote:
>> This hook is added to avoid writing other plane registers in case of
>> async flips, so that we do not write the double buffered registers
>> during async surface address update.
>>
>> v7: -Plane ctl needs bits from skl_plane_ctl_crtc as well. (Ville)
>>      -Add a vfunc for skl_program_async_surface_address
>>       and call it from intel_update_plane. (Ville)
>>
>> v8: -Rebased.
>>
>> Signed-off-by: Karthik B S <karthik.b.s@intel.com>
>> Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
>> ---
>>   .../gpu/drm/i915/display/intel_atomic_plane.c |  7 ++++++
>>   .../drm/i915/display/intel_display_types.h    |  3 +++
>>   drivers/gpu/drm/i915/display/intel_sprite.c   | 24 +++++++++++++++++++
>>   3 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
>> index 79032701873a..fdc633020255 100644
>> --- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
>> +++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
>> @@ -408,6 +408,13 @@ void intel_update_plane(struct intel_plane *plane,
>>   	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>>   
>>   	trace_intel_update_plane(&plane->base, crtc);
>> +
>> +	if (crtc_state->uapi.async_flip) {
>> +		plane->program_async_surface_address(plane,
>> +						     crtc_state, plane_state);
>> +		return;
>> +	}
> 
> if
> 	.async_flip()
> else
> 	.update_plane()
> 
> should do
> 

Thanks for the review.
Sure, I'll update this.
>> +
>>   	plane->update_plane(plane, crtc_state, plane_state);
>>   }
>>   
>> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
>> index b2d0edacc58c..d2ae781e4d81 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
>> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
>> @@ -1190,6 +1190,9 @@ struct intel_plane {
>>   			   struct intel_plane_state *plane_state);
>>   	int (*min_cdclk)(const struct intel_crtc_state *crtc_state,
>>   			 const struct intel_plane_state *plane_state);
>> +	void (*program_async_surface_address)(struct intel_plane *plane,
> 
> That's a mouthful. I'd simplify it to eg. just .async_flip().
> 

Sure, I'll change the name.

Thanks,
Karthik.B.S
>> +					      const struct intel_crtc_state *crtc_state,
>> +					      const struct intel_plane_state *plane_state);
>>   };
>>   
>>   struct intel_watermark_params {
>> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
>> index f0c89418d2e1..69407dfcebf6 100644
>> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
>> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
>> @@ -609,6 +609,29 @@ icl_program_input_csc(struct intel_plane *plane,
>>   			  PLANE_INPUT_CSC_POSTOFF(pipe, plane_id, 2), 0x0);
>>   }
>>   
>> +static void
>> +skl_program_async_surface_address(struct intel_plane *plane,
>> +				  const struct intel_crtc_state *crtc_state,
>> +				  const struct intel_plane_state *plane_state)
>> +{
>> +	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
>> +	unsigned long irqflags;
>> +	enum plane_id plane_id = plane->id;
>> +	enum pipe pipe = plane->pipe;
>> +	u32 surf_addr = plane_state->color_plane[0].offset;
>> +	u32 plane_ctl = plane_state->ctl;
>> +
>> +	plane_ctl |= skl_plane_ctl_crtc(crtc_state);
>> +
>> +	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
>> +
>> +	intel_de_write_fw(dev_priv, PLANE_CTL(pipe, plane_id), plane_ctl);
>> +	intel_de_write_fw(dev_priv, PLANE_SURF(pipe, plane_id),
>> +			  intel_plane_ggtt_offset(plane_state) + surf_addr);
>> +
>> +	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
>> +}
>> +
>>   static void
>>   skl_program_plane(struct intel_plane *plane,
>>   		  const struct intel_crtc_state *crtc_state,
>> @@ -3096,6 +3119,7 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
>>   	plane->get_hw_state = skl_plane_get_hw_state;
>>   	plane->check_plane = skl_plane_check;
>>   	plane->min_cdclk = skl_plane_min_cdclk;
>> +	plane->program_async_surface_address = skl_program_async_surface_address;
>>   
>>   	if (INTEL_GEN(dev_priv) >= 11)
>>   		formats = icl_get_plane_formats(dev_priv, pipe,
>> -- 
>> 2.22.0
> 
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