Re: [Intel-gfx] [PATCH v2 16/22] drm/i915/rkl: Don't try to access transcoder D

[Matt Roper <matthew.d.roper@intel.com>]

On Mon, May 04, 2020 at 03:52:21PM -0700, Matt Roper wrote:
> There are a couple places in our driver that loop over transcoders A..D
> for gen11+; since RKL only has three pipes/transcoders, this can lead to
> unclaimed register reads/writes.  We should add checks for transcoder
> existence where appropriate.
> 
> Cc: Aditya Swarup <aditya.swarup@intel.com>
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 3 +++
>  drivers/gpu/drm/i915/i915_irq.c              | 6 ++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index fcfc3812ef28..2eeafda82188 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -11007,6 +11007,9 @@ static bool bxt_get_dsi_transcoder_state(struct intel_crtc *crtc,
>  		else
>  			cpu_transcoder = TRANSCODER_DSI_C;
>  
> +		if (!HAS_TRANSCODER(dev_priv, cpu_transcoder))
> +			continue;
> +

It looks like this hunk wound up in the wrong function after a conflict
resolution.  It was supposed to be in icl_get_trans_port_sync_config()
instead (this BXT function doesn't execute on gen >= 11).


Matt

>  		power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
>  		drm_WARN_ON(dev, *power_domain_mask & BIT_ULL(power_domain));
>  
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 622986759ec6..1381cb530c2f 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2849,6 +2849,9 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
>  		for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
>  			enum intel_display_power_domain domain;
>  
> +			if (!HAS_TRANSCODER(dev_priv, trans))
> +				continue;
> +
>  			domain = POWER_DOMAIN_TRANSCODER(trans);
>  			if (!intel_display_power_is_enabled(dev_priv, domain))
>  				continue;
> @@ -3399,6 +3402,9 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>  		for (trans = TRANSCODER_A; trans <= TRANSCODER_D; trans++) {
>  			enum intel_display_power_domain domain;
>  
> +			if (!HAS_TRANSCODER(dev_priv, trans))
> +				continue;
> +
>  			domain = POWER_DOMAIN_TRANSCODER(trans);
>  			if (!intel_display_power_is_enabled(dev_priv, domain))
>  				continue;
> -- 
> 2.24.1
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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