Re: [Intel-gfx] [PATCH 1/1] drm/i915: dgfx cards need to wait on pcode's uncore init done

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Tue, Jul 27, 2021 at 11:03:38PM +0530, badal.nilawar@intel.com wrote:
> From: Badal Nilawar <badal.nilawar@intel.com>
> 
> In discrete cards, the graphics driver shouldn't proceed with the probe
> or resume unless PCODE indicated everything is done, including memory
> training and gt bring up.
> 
> For this reason, the driver probe and resume paths needs to be blocked
> until PCODE indicates it is done. Also, it needs to aborted if the
> notification never arrives.
> 
> In general, the few miliseconds would be enough and the regular PCODE
> recommendation for the timeout was 10 seconds. However there are some
> rare cases where this initialization can take up to 1 minute. So,
> PCODE has increased the recommendation to 3 minutes so we don't fully
> block the device utilization when something just got delayed for
> whatever reason. To be on the safest side, let's accept this
> recommendation, since on the regular case it won't delay or block the
> driver initialization and resume flows
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.c       |  8 +++++++-
>  drivers/gpu/drm/i915/intel_sideband.c | 13 +++++++++----
>  drivers/gpu/drm/i915/intel_sideband.h |  2 +-
>  3 files changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index c43b698bf0b97..59fb4c710c8ca 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -620,7 +620,9 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
>  
>  	intel_opregion_setup(dev_priv);
>  
> -	intel_pcode_init(dev_priv);
> +	ret = intel_pcode_init(dev_priv);
> +	if (ret)
> +		goto err_msi;
>  
>  	/*
>  	 * Fill the dram structure to get the system dram info. This will be
> @@ -1231,6 +1233,10 @@ static int i915_drm_resume(struct drm_device *dev)
>  
>  	disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
>  
> +	ret = intel_pcode_init(dev_priv);
> +	if (ret)
> +		return ret;
> +
>  	sanitize_gpu(dev_priv);
>  
>  	ret = i915_ggtt_enable_hw(dev_priv);
> diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
> index f0a82b37bd1ac..e304bf44e1ff8 100644
> --- a/drivers/gpu/drm/i915/intel_sideband.c
> +++ b/drivers/gpu/drm/i915/intel_sideband.c
> @@ -556,17 +556,22 @@ int skl_pcode_request(struct drm_i915_private *i915, u32 mbox, u32 request,
>  #undef COND
>  }
>  
> -void intel_pcode_init(struct drm_i915_private *i915)
> +int intel_pcode_init(struct drm_i915_private *i915)
>  {
> -	int ret;
> +	int ret = 0;
>  
>  	if (!IS_DGFX(i915))
> -		return;
> +		return ret;
>  
>  	ret = skl_pcode_request(i915, DG1_PCODE_STATUS,
>  				DG1_UNCORE_GET_INIT_STATUS,
>  				DG1_UNCORE_INIT_STATUS_COMPLETE,
> -				DG1_UNCORE_INIT_STATUS_COMPLETE, 50);
> +				DG1_UNCORE_INIT_STATUS_COMPLETE, 180000);
> +
> +	drm_dbg(&i915->drm, "PCODE init status %d\n", ret);
> +
>  	if (ret)
>  		drm_err(&i915->drm, "Pcode did not report uncore initialization completion!\n");
> +
> +	return ret;
>  }
> diff --git a/drivers/gpu/drm/i915/intel_sideband.h b/drivers/gpu/drm/i915/intel_sideband.h
> index 094c7b19c5d42..d1d14bcb8f56e 100644
> --- a/drivers/gpu/drm/i915/intel_sideband.h
> +++ b/drivers/gpu/drm/i915/intel_sideband.h
> @@ -138,6 +138,6 @@ int sandybridge_pcode_write_timeout(struct drm_i915_private *i915, u32 mbox,
>  int skl_pcode_request(struct drm_i915_private *i915, u32 mbox, u32 request,
>  		      u32 reply_mask, u32 reply, int timeout_base_ms);
>  
> -void intel_pcode_init(struct drm_i915_private *i915);
> +int intel_pcode_init(struct drm_i915_private *i915);
>  
>  #endif /* _INTEL_SIDEBAND_H */
> -- 
> 2.25.1
> 
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