[10/14] drm/i915/display/vdsc: Add ultrajoiner support with DSC

Commit Message

Ankit Nautiyal Sept. 6, 2024, 12:58 p.m. UTC

From: Stanislav Lisovskiy <[e-mail]>

Add changes to DSC which are required for Ultrajoiner.

v2:
-Use correct helper for setting bits for bigjoiner secondary. (Ankit)
-Use enum for joiner pipe count instead magic numbers. (Suraj)
-Use primary/secondary instead of master/slave. (Suraj)

Signed-off-by: Stanislav Lisovskiy <[e-mail]>
Signed-off-by: Ankit Nautiyal <[e-mail]>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c | 26 +++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

Comments

Ville Syrjala Sept. 6, 2024, 4:30 p.m. UTC | #1

On Fri, Sep 06, 2024 at 06:28:03PM +0530, Ankit Nautiyal wrote:
> From: Stanislav Lisovskiy <[e-mail]>
> 
> Add changes to DSC which are required for Ultrajoiner.
> 
> v2:
> -Use correct helper for setting bits for bigjoiner secondary. (Ankit)
> -Use enum for joiner pipe count instead magic numbers. (Suraj)
> -Use primary/secondary instead of master/slave. (Suraj)
> 
> Signed-off-by: Stanislav Lisovskiy <[e-mail]>
> Signed-off-by: Ankit Nautiyal <[e-mail]>
> ---
>  drivers/gpu/drm/i915/display/intel_vdsc.c | 26 +++++++++++++++++++++--
>  1 file changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index 8158e3702ed5..66e810c8de68 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -379,9 +379,11 @@ static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state
>  int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
>  {
>  	int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
> +	int joined_pipes = intel_joiner_num_pipes(crtc_state);
>  
> -	if (crtc_state->joiner_pipes)
> -		num_vdsc_instances *= 2;
> +	if (joined_pipes == INTEL_BIG_JOINER_PIPES ||
> +	    joined_pipes == INTEL_ULTRA_JOINER_PIPES)
> +		num_vdsc_instances *= joined_pipes;
>  
>  	return num_vdsc_instances;
>  }
> @@ -751,6 +753,14 @@ void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state)
>  	}
>  }
>  
> +static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
> +{
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> +
> +	return intel_joiner_num_pipes(crtc_state) == INTEL_ULTRA_JOINER_PIPES &&
> +	       crtc->pipe != PIPE_D;
> +}
> +
>  void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
>  {
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> @@ -770,7 +780,19 @@ void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
>  		dss_ctl1_val |= JOINER_ENABLE;
>  	}
>  	if (crtc_state->joiner_pipes) {
> +		/*
> +		 * This bit doesn't seem to follow primary/secondary logic or
> +		 * any other logic, so lets just add helper function to
> +		 * at least hide this hassle..
> +		 */
> +		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))

What is this crazyness? This would throw a big wrench into
the works, eg. the ultrajoiner readout would not work as intended.

> +			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
> +
> +		if (intel_crtc_is_ultrajoiner_primary(crtc_state))
> +			dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;
> +
>  		dss_ctl1_val |= BIG_JOINER_ENABLE;
> +
>  		if (intel_crtc_is_bigjoiner_primary(crtc_state))
>  			dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
>  	}
> -- 
> 2.45.2

Ville Syrjala Sept. 6, 2024, 4:39 p.m. UTC | #2

On Fri, Sep 06, 2024 at 07:30:16PM +0300, Ville Syrjälä wrote:
> On Fri, Sep 06, 2024 at 06:28:03PM +0530, Ankit Nautiyal wrote:
> > From: Stanislav Lisovskiy <[e-mail]>
> > 
> > Add changes to DSC which are required for Ultrajoiner.
> > 
> > v2:
> > -Use correct helper for setting bits for bigjoiner secondary. (Ankit)
> > -Use enum for joiner pipe count instead magic numbers. (Suraj)
> > -Use primary/secondary instead of master/slave. (Suraj)
> > 
> > Signed-off-by: Stanislav Lisovskiy <[e-mail]>
> > Signed-off-by: Ankit Nautiyal <[e-mail]>
> > ---
> >  drivers/gpu/drm/i915/display/intel_vdsc.c | 26 +++++++++++++++++++++--
> >  1 file changed, 24 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> > index 8158e3702ed5..66e810c8de68 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> > @@ -379,9 +379,11 @@ static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state
> >  int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
> >  {
> >  	int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
> > +	int joined_pipes = intel_joiner_num_pipes(crtc_state);
> >  
> > -	if (crtc_state->joiner_pipes)
> > -		num_vdsc_instances *= 2;
> > +	if (joined_pipes == INTEL_BIG_JOINER_PIPES ||
> > +	    joined_pipes == INTEL_ULTRA_JOINER_PIPES)
> > +		num_vdsc_instances *= joined_pipes;
> >  
> >  	return num_vdsc_instances;
> >  }
> > @@ -751,6 +753,14 @@ void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state)
> >  	}
> >  }
> >  
> > +static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
> > +{
> > +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > +
> > +	return intel_joiner_num_pipes(crtc_state) == INTEL_ULTRA_JOINER_PIPES &&
> > +	       crtc->pipe != PIPE_D;
> > +}
> > +
> >  void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
> >  {
> >  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > @@ -770,7 +780,19 @@ void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
> >  		dss_ctl1_val |= JOINER_ENABLE;
> >  	}
> >  	if (crtc_state->joiner_pipes) {
> > +		/*
> > +		 * This bit doesn't seem to follow primary/secondary logic or
> > +		 * any other logic, so lets just add helper function to
> > +		 * at least hide this hassle..
> > +		 */
> > +		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
> 
> What is this crazyness? This would throw a big wrench into
> the works, eg. the ultrajoiner readout would not work as intended.

Hmm. I do see a note to this effect in bspec. But that doesn't make
any real sense. I would expect that we either enable this for
everything, or only for pipes A+C (the bigjoiner primaries).
The latter would seem sensible, but it would also mean that
we need to rethink the readout as well.

> 
> > +			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
> > +
> > +		if (intel_crtc_is_ultrajoiner_primary(crtc_state))
> > +			dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;
> > +
> >  		dss_ctl1_val |= BIG_JOINER_ENABLE;
> > +
> >  		if (intel_crtc_is_bigjoiner_primary(crtc_state))
> >  			dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
> >  	}
> > -- 
> > 2.45.2
> 
> -- 
> Ville Syrjälä
> Intel

Ankit Nautiyal Sept. 9, 2024, 9:23 a.m. UTC | #3

On 9/6/2024 10:09 PM, Ville Syrjälä wrote:
> On Fri, Sep 06, 2024 at 07:30:16PM +0300, Ville Syrjälä wrote:
>> On Fri, Sep 06, 2024 at 06:28:03PM +0530, Ankit Nautiyal wrote:
>>> From: Stanislav Lisovskiy <[e-mail]>
>>>
>>> Add changes to DSC which are required for Ultrajoiner.
>>>
>>> v2:
>>> -Use correct helper for setting bits for bigjoiner secondary. (Ankit)
>>> -Use enum for joiner pipe count instead magic numbers. (Suraj)
>>> -Use primary/secondary instead of master/slave. (Suraj)
>>>
>>> Signed-off-by: Stanislav Lisovskiy <[e-mail]>
>>> Signed-off-by: Ankit Nautiyal <[e-mail]>
>>> ---
>>>   drivers/gpu/drm/i915/display/intel_vdsc.c | 26 +++++++++++++++++++++--
>>>   1 file changed, 24 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
>>> index 8158e3702ed5..66e810c8de68 100644
>>> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
>>> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
>>> @@ -379,9 +379,11 @@ static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state
>>>   int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
>>>   {
>>>   	int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
>>> +	int joined_pipes = intel_joiner_num_pipes(crtc_state);
>>>   
>>> -	if (crtc_state->joiner_pipes)
>>> -		num_vdsc_instances *= 2;
>>> +	if (joined_pipes == INTEL_BIG_JOINER_PIPES ||
>>> +	    joined_pipes == INTEL_ULTRA_JOINER_PIPES)
>>> +		num_vdsc_instances *= joined_pipes;
>>>   
>>>   	return num_vdsc_instances;
>>>   }
>>> @@ -751,6 +753,14 @@ void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state)
>>>   	}
>>>   }
>>>   
>>> +static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
>>> +{
>>> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>>> +
>>> +	return intel_joiner_num_pipes(crtc_state) == INTEL_ULTRA_JOINER_PIPES &&
>>> +	       crtc->pipe != PIPE_D;
>>> +}
>>> +
>>>   void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
>>>   {
>>>   	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>>> @@ -770,7 +780,19 @@ void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
>>>   		dss_ctl1_val |= JOINER_ENABLE;
>>>   	}
>>>   	if (crtc_state->joiner_pipes) {
>>> +		/*
>>> +		 * This bit doesn't seem to follow primary/secondary logic or
>>> +		 * any other logic, so lets just add helper function to
>>> +		 * at least hide this hassle..
>>> +		 */
>>> +		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
>> What is this crazyness? This would throw a big wrench into
>> the works, eg. the ultrajoiner readout would not work as intended.
> Hmm. I do see a note to this effect in bspec. But that doesn't make
> any real sense. I would expect that we either enable this for
> everything, or only for pipes A+C (the bigjoiner primaries).
> The latter would seem sensible, but it would also mean that
> we need to rethink the readout as well.

Yes as per bspec : The ULTRA_JOINER_ENABLE bit will be set for Pipe A, 
Pipe B and Pipe C only.

Are you suggesting to write this for D as well? or just for A and C?

Also PRIMARY_ULTRA_JOINER_ENABLE is to be set for A. For other pipes 
this bit will be reset.

Though only C is ultrajoiner secondary pipe, but since for other pipes 
this bit is reset, how to make that distinction between C and others.

I mean readout will tell ultrajoiner primary as A and ultrajoiner 
secondary as B,C,D as bit is reset for all three.

Currently we have secondary ultrajoiner pipes reading 0xE.

Regards,

Ankit

>>> +			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
>>> +
>>> +		if (intel_crtc_is_ultrajoiner_primary(crtc_state))
>>> +			dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;
>>> +
>>>   		dss_ctl1_val |= BIG_JOINER_ENABLE;
>>> +
>>>   		if (intel_crtc_is_bigjoiner_primary(crtc_state))
>>>   			dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
>>>   	}
>>> -- 
>>> 2.45.2
>> -- 
>> Ville Syrjälä
>> Intel

Ville Syrjala Sept. 9, 2024, 1:46 p.m. UTC | #4

On Mon, Sep 09, 2024 at 02:53:55PM +0530, Nautiyal, Ankit K wrote:
> 
> On 9/6/2024 10:09 PM, Ville Syrjälä wrote:
> > On Fri, Sep 06, 2024 at 07:30:16PM +0300, Ville Syrjälä wrote:
> >> On Fri, Sep 06, 2024 at 06:28:03PM +0530, Ankit Nautiyal wrote:
> >>> From: Stanislav Lisovskiy <[e-mail]>
> >>>
> >>> Add changes to DSC which are required for Ultrajoiner.
> >>>
> >>> v2:
> >>> -Use correct helper for setting bits for bigjoiner secondary. (Ankit)
> >>> -Use enum for joiner pipe count instead magic numbers. (Suraj)
> >>> -Use primary/secondary instead of master/slave. (Suraj)
> >>>
> >>> Signed-off-by: Stanislav Lisovskiy <[e-mail]>
> >>> Signed-off-by: Ankit Nautiyal <[e-mail]>
> >>> ---
> >>>   drivers/gpu/drm/i915/display/intel_vdsc.c | 26 +++++++++++++++++++++--
> >>>   1 file changed, 24 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> >>> index 8158e3702ed5..66e810c8de68 100644
> >>> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> >>> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> >>> @@ -379,9 +379,11 @@ static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state
> >>>   int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
> >>>   {
> >>>   	int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
> >>> +	int joined_pipes = intel_joiner_num_pipes(crtc_state);
> >>>   
> >>> -	if (crtc_state->joiner_pipes)
> >>> -		num_vdsc_instances *= 2;
> >>> +	if (joined_pipes == INTEL_BIG_JOINER_PIPES ||
> >>> +	    joined_pipes == INTEL_ULTRA_JOINER_PIPES)
> >>> +		num_vdsc_instances *= joined_pipes;
> >>>   
> >>>   	return num_vdsc_instances;
> >>>   }
> >>> @@ -751,6 +753,14 @@ void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state)
> >>>   	}
> >>>   }
> >>>   
> >>> +static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
> >>> +{
> >>> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> >>> +
> >>> +	return intel_joiner_num_pipes(crtc_state) == INTEL_ULTRA_JOINER_PIPES &&
> >>> +	       crtc->pipe != PIPE_D;
> >>> +}
> >>> +
> >>>   void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
> >>>   {
> >>>   	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> >>> @@ -770,7 +780,19 @@ void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
> >>>   		dss_ctl1_val |= JOINER_ENABLE;
> >>>   	}
> >>>   	if (crtc_state->joiner_pipes) {
> >>> +		/*
> >>> +		 * This bit doesn't seem to follow primary/secondary logic or
> >>> +		 * any other logic, so lets just add helper function to
> >>> +		 * at least hide this hassle..
> >>> +		 */
> >>> +		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
> >> What is this crazyness? This would throw a big wrench into
> >> the works, eg. the ultrajoiner readout would not work as intended.
> > Hmm. I do see a note to this effect in bspec. But that doesn't make
> > any real sense. I would expect that we either enable this for
> > everything, or only for pipes A+C (the bigjoiner primaries).
> > The latter would seem sensible, but it would also mean that
> > we need to rethink the readout as well.
> 
> Yes as per bspec : The ULTRA_JOINER_ENABLE bit will be set for Pipe A, 
> Pipe B and Pipe C only.
> 
> Are you suggesting to write this for D as well? or just for A and C?

We need to find out what the hardware actually needs. Do we really have
to set this for A+B+C and not for D, or is it enough to set it for
A+C and not for B+D, and what happens if we try to set it for all pipes.

If the hardware only needs it for some kind of subset of the pipes,
then I think we need to do some kind of slight fixup in the readout
code to convert the masks into a more reasonable form for the
WARN_ON()s/etc.

> 
> Also PRIMARY_ULTRA_JOINER_ENABLE is to be set for A. For other pipes 
> this bit will be reset.
> 
> Though only C is ultrajoiner secondary pipe, but since for other pipes 
> this bit is reset, how to make that distinction between C and others.
> 
> I mean readout will tell ultrajoiner primary as A and ultrajoiner 
> secondary as B,C,D as bit is reset for all three.
> 
> Currently we have secondary ultrajoiner pipes reading 0xE.
> 
> Regards,
> 
> Ankit
> 
> >>> +			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
> >>> +
> >>> +		if (intel_crtc_is_ultrajoiner_primary(crtc_state))
> >>> +			dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;
> >>> +
> >>>   		dss_ctl1_val |= BIG_JOINER_ENABLE;
> >>> +
> >>>   		if (intel_crtc_is_bigjoiner_primary(crtc_state))
> >>>   			dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
> >>>   	}
> >>> -- 
> >>> 2.45.2
> >> -- 
> >> Ville Syrjälä
> >> Intel

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 8158e3702ed5..66e810c8de68 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -379,9 +379,11 @@  static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state
 int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
 {
 	int num_vdsc_instances = intel_dsc_get_vdsc_per_pipe(crtc_state);
+	int joined_pipes = intel_joiner_num_pipes(crtc_state);
 
-	if (crtc_state->joiner_pipes)
-		num_vdsc_instances *= 2;
+	if (joined_pipes == INTEL_BIG_JOINER_PIPES ||
+	    joined_pipes == INTEL_ULTRA_JOINER_PIPES)
+		num_vdsc_instances *= joined_pipes;
 
 	return num_vdsc_instances;
 }
@@ -751,6 +753,14 @@  void intel_uncompressed_joiner_enable(const struct intel_crtc_state *crtc_state)
 	}
 }
 
+static bool intel_crtc_ultrajoiner_enable_needed(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	return intel_joiner_num_pipes(crtc_state) == INTEL_ULTRA_JOINER_PIPES &&
+	       crtc->pipe != PIPE_D;
+}
+
 void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -770,7 +780,19 @@  void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
 		dss_ctl1_val |= JOINER_ENABLE;
 	}
 	if (crtc_state->joiner_pipes) {
+		/*
+		 * This bit doesn't seem to follow primary/secondary logic or
+		 * any other logic, so lets just add helper function to
+		 * at least hide this hassle..
+		 */
+		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
+			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
+
+		if (intel_crtc_is_ultrajoiner_primary(crtc_state))
+			dss_ctl1_val |= PRIMARY_ULTRA_JOINER_ENABLE;
+
 		dss_ctl1_val |= BIG_JOINER_ENABLE;
+
 		if (intel_crtc_is_bigjoiner_primary(crtc_state))
 			dss_ctl1_val |= PRIMARY_BIG_JOINER_ENABLE;
 	}