[Bug 101865] [HSW/IVB] Blank screen after resume with HSW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101865

--- Comment #15 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to nutrinfnon from comment #12)
> Created attachment 135095 [details]
> test 4.14.0-rc6
> 
> Hello,
> 
> among the latest S3/S4 patches are:
> 
> 2017-10-04	drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct
> drm_i915_private *dev_priv, bool resume
>  
>  	/* 6. Enable DBUF */
>  	gen9_dbuf_enable(dev_priv);
> +
> +	if (resume && dev_priv->csr.dmc_payload)
> +		intel_csr_load_program(dev_priv);
>  }
> 2017-10-04	drm/i915/cnl: Reprogram DMC firmware after S3/S4 resume
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 7933d1b..3791c3f 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2809,6 +2809,9 @@ static void cnl_display_core_init(struct
> drm_i915_private *dev_priv, bool resume
>  
>  	/* 6. Enable DBUF */
>  	gen9_dbuf_enable(dev_priv);
> +
> +	if (resume && dev_priv->csr.dmc_payload)
> +		intel_csr_load_program(dev_priv);
>  }
> 
> 
> These patches are already merged in linux-4.14.0-rc6, so I tried it.
> 
> My test with 4.14.0-rc6 still shows the presence of the problem, blank
> screen after resume.

No surprise there, given that the the above changes are only relevant for
Cannonlake.

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