On Mon, Feb 26, 2018 at 07:27:23PM -0800, Dhinakaran Pandiyan wrote:
> eDP spec says - "If PSR/PSR2 is supported, the SET_POWER_CAPABLE bit in the
> EDP_GENERAL_CAPABILITY_1 register (DPCD Address 00701h, bit d7) must be set
> to 1."
>
> Reject PSR on panels without this cap bit set as such panels cannot be
> controlled via SET_POWER & SET_DP_PWR_VOLTAGE register and the DP source
> needs to be able to do that for PSR.
>
> Thanks to Nathan for debugging this.
>
> Panel cap checks like this can be done just once, let's fix this
> when PSR dpcd init movement lands.
>
> Cc: Nathan D Ciobanu <[email protected]>
> Cc: Rodrigo Vivi <[email protected]>
> Signed-off-by: Dhinakaran Pandiyan <[email protected]>
Tested-by: Nathan Ciobanu <[email protected]>
> ---
> drivers/gpu/drm/i915/intel_psr.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 89f41d28c44a..e0701b7f87f7 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -405,6 +405,11 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
> return;
> }
>
> + if (!(intel_dp->edp_dpcd[1] & DP_EDP_SET_POWER_CAP)) {
> + DRM_DEBUG_KMS("PSR condition failed: panel lacks power state
> control\n");
> + return;
> + }
> +
> /*
> * FIXME psr2_support is messed up. It's both computed
> * dynamically during PSR enable, and extracted from sink
> --
> 2.14.1
>
> _______________________________________________
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