Re: [Intel-gfx] [PATCH 2/2] drm/i915: Perform dpll commit first.

[Maarten Lankhorst]

Op 26-11-15 om 15:41 schreef Ander Conselvan De Oliveira:
> On Tue, 2015-11-24 at 10:44 +0100, Maarten Lankhorst wrote:
>> Warn for the wrong mask in enable only. Disable will have the wrong mask
>> now because the new state is committed before disabling the old state.
> Why?
>
> Ander
>
This is required for async commit. In that case the state has to be committed 
while
still holding the connection_mutex, but the modeset itself is run 
asynchronously.
This also means that any modeset has to wait for previous modesets to complete,
otherwise the pll state may be updated incorrectly.

~Maarten
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Re: [Intel-gfx] [PATCH 2/2] drm/i915: Perform dpll commit first.

[Ander Conselvan De Oliveira]

On Tue, 2015-11-24 at 10:44 +0100, Maarten Lankhorst wrote:
> Warn for the wrong mask in enable only. Disable will have the wrong mask
> now because the new state is committed before disabling the old state.

Why?

Ander

> Signed-off-by: Maarten Lankhorst 
> ---
>  drivers/gpu/drm/i915/intel_display.c | 10 +++---
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 79bb22ef67dc..3eb51195da72 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1897,7 +1897,7 @@ static void intel_enable_shared_dpll(struct intel_crtc
> *crtc)
>   if (WARN_ON(pll == NULL))
>   return;
>  
> - if (WARN_ON(pll->config.crtc_mask == 0))
> + if (WARN_ON(!(pll->config.crtc_mask & (1 << drm_crtc_index(&crtc
> ->base)
>   return;
>  
>   if (WARN_ON(pll->active_mask & crtc_mask))
> @@ -1937,9 +1937,6 @@ static void intel_disable_shared_dpll(struct intel_crtc
> *crtc)
>   if (pll == NULL)
>   return;
>  
> - if (WARN_ON(!(pll->config.crtc_mask & crtc_mask)))
> - return;
> -
>   if (WARN_ON(!(pll->active_mask & crtc_mask)))
>   return;
>  
> @@ -13382,7 +13379,8 @@ static int intel_atomic_commit(struct drm_device *dev,
>   }
>  
>   drm_atomic_helper_swap_state(dev, state);
> - dev_priv->wm.config = to_intel_atomic_state(state)->wm_config;
> + dev_priv->wm.config = intel_state->wm_config;
> + intel_shared_dpll_commit(state);
>  
>   if (intel_state->modeset) {
>   memcpy(dev_priv->min_pixclk, intel_state->min_pixclk,
> @@ -13415,8 +13413,6 @@ static int intel_atomic_commit(struct drm_device *dev,
>   intel_modeset_update_crtc_state(state);
>  
>   if (intel_state->modeset) {
> - intel_shared_dpll_commit(state);
> -
>   drm_atomic_helper_update_legacy_modeset_state(state->dev,
> state);
>   modeset_update_crtc_power_domains(state);
>   }
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