Re: [PATCH 1/3] drm/i915: eDP Panel Power sequencing modify use of HAS_PCH_SPLIT

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 30 Apr 2015, Vandana Kannan <vandana.kannan@intel.com> wrote:
> Changes based on future platform readiness patches related to
> HAS_PCH_SPLIT(). Use HAS_GMCH_DISPLAY() instead of HAS_PCH_SPLIT
>
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> Signed-off-by: A.Sunil Kamath <sunil.kamath@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_suspend.c | 4 ++--
>  drivers/gpu/drm/i915/intel_dp.c     | 8 ++++----
>  2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
> index cf67f82..e91d637 100644
> --- a/drivers/gpu/drm/i915/i915_suspend.c
> +++ b/drivers/gpu/drm/i915/i915_suspend.c
> @@ -44,7 +44,7 @@ static void i915_save_display(struct drm_device *dev)
>  		dev_priv->regfile.saveLVDS = I915_READ(LVDS);
>  
>  	/* Panel power sequencer */
> -	if (HAS_PCH_SPLIT(dev)) {
> +	if (!HAS_GMCH_DISPLAY(dev)) {
>  		dev_priv->regfile.savePP_CONTROL = I915_READ(PCH_PP_CONTROL);
>  		dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PCH_PP_ON_DELAYS);
>  		dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PCH_PP_OFF_DELAYS);
> @@ -79,7 +79,7 @@ static void i915_restore_display(struct drm_device *dev)
>  		I915_WRITE(LVDS, dev_priv->regfile.saveLVDS & mask);
>  
>  	/* Panel power sequencer */
> -	if (HAS_PCH_SPLIT(dev)) {
> +	if (!HAS_GMCH_DISPLAY(dev)) {
>  		I915_WRITE(PCH_PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
>  		I915_WRITE(PCH_PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
>  		I915_WRITE(PCH_PP_DIVISOR, dev_priv->regfile.savePP_DIVISOR);

I don't think you should touch i915_suspend.c at all. We're trying to
get rid of this blind register save/restore, and make everything work in
the encoder/connector code. Do note that we already skip this for
vlv/chv power sequencer registers.

> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 937ba31..68e10c1 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -559,7 +559,7 @@ static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)
>  {
>  	struct drm_device *dev = intel_dp_to_dev(intel_dp);
>  
> -	if (HAS_PCH_SPLIT(dev))
> +	if (!HAS_GMCH_DISPLAY(dev))
>  		return PCH_PP_CONTROL;
>  	else
>  		return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp));
> @@ -569,7 +569,7 @@ static u32 _pp_stat_reg(struct intel_dp *intel_dp)
>  {
>  	struct drm_device *dev = intel_dp_to_dev(intel_dp);
>  
> -	if (HAS_PCH_SPLIT(dev))
> +	if (!HAS_GMCH_DISPLAY(dev))
>  		return PCH_PP_STATUS;
>  	else
>  		return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));
> @@ -4963,7 +4963,7 @@ intel_dp_init_panel_power_sequencer(struct drm_device *dev,
>  	if (final->t11_t12 != 0)
>  		return;
>  
> -	if (HAS_PCH_SPLIT(dev)) {
> +	if (!HAS_GMCH_DISPLAY(dev)) {
>  		pp_ctrl_reg = PCH_PP_CONTROL;
>  		pp_on_reg = PCH_PP_ON_DELAYS;
>  		pp_off_reg = PCH_PP_OFF_DELAYS;
> @@ -5063,7 +5063,7 @@ intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
>  
>  	lockdep_assert_held(&dev_priv->pps_mutex);
>  
> -	if (HAS_PCH_SPLIT(dev)) {
> +	if (!HAS_GMCH_DISPLAY(dev)) {
>  		pp_on_reg = PCH_PP_ON_DELAYS;
>  		pp_off_reg = PCH_PP_OFF_DELAYS;
>  		pp_div_reg = PCH_PP_DIVISOR;

For the rest, I'd like you to do what I suggested in my reply to patch
3, i.e. add a new if (IS_BROXTON(dev)) at the top of each of these, with
BXT_PP_WHATEVER(0) as the register. Later on, we can add code to choose
the power sequencer, a bit similar to what vlv/chv do now (except there
it's based on pipe).

BR,
Jani.


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-- 
Jani Nikula, Intel Open Source Technology Center
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