[Intel-gfx] [PATCH 1/3] drm/i915: No panel fitter on 830M or non-mobile gen2/3 platforms

[Daniel Vetter]

On Fri, Jan 10, 2014 at 02:06:45PM +0200, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> PFIT_CONTROL doesn't exist on 830M, so avoid reading it in
> i9xx_get_pfit_config().
> 
> Also assume that only mobile gen2/3 chipsets have a panel fitter. This
> matches the documentation, but I didn't have real hardware to verify.
> 
> Gen4 docmentation is a bit inconsistent, but experimenetation on my
> LPT machine suggests that the panel fitter is available on non-mobile
> gen4 platforms. At least on this machine panel fitter appears works
> just fine even on VGA output.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 +++
>  drivers/gpu/drm/i915/intel_overlay.c | 2 +-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a51e105..9f8c5b5 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5428,6 +5428,9 @@ static void i9xx_get_pfit_config(struct intel_crtc *crtc,
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	uint32_t tmp;
>  
> +	if (INTEL_INFO(dev)->gen <= 3 && (IS_I830(dev) || !IS_MOBILE(dev)))
> +		return;
> +
>  	tmp = I915_READ(PFIT_CONTROL);
>  	if (!(tmp & PFIT_ENABLE))
>  		return;
> diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
> index a1397b1..424f094 100644
> --- a/drivers/gpu/drm/i915/intel_overlay.c
> +++ b/drivers/gpu/drm/i915/intel_overlay.c
> @@ -1005,7 +1005,7 @@ static int intel_panel_fitter_pipe(struct drm_device *dev)
>  	u32  pfit_control;
>  
>  	/* i830 doesn't have a panel fitter */
> -	if (IS_I830(dev))
> +	if (INTEL_INFO(dev)->gen <= 3 && (IS_I830(dev) || !IS_MOBILE(dev)))

Hm, we could switch that code to the pipe config. Like we've already done
for the double-wide stuff. Like we've done for the double-wide checks
already ...
-Daniel

>  		return -1;
>  
>  	pfit_control = I915_READ(PFIT_CONTROL);
> -- 
> 1.8.3.2
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch