[Intel-gfx] [v3 1/2] drm/i915/icl: Ungate ddi clocks before IO enable

[Jani Nikula]

On Mon, 25 Mar 2019, Vandita Kulkarni <vandita.kulkarni at intel.com> wrote:
> IO enable sequencing needs ddi clocks enabled.
> These clocks will be gated at a later point in
> the enable sequence.
>
> v2: Fix the commit header (Uma)
> v3: Remove the redundant read (Ville)
>
> Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
> Reviewed-by: Uma Shankar <uma.shankar at intel.com>

Fixes: 949fc52af19e ("drm/i915/icl: add pll mapping for DSI")

Both patches look fine, I'll merge once we get a positive CI result (I
queued a re-test),

BR,
Jani.

> ---
>  drivers/gpu/drm/i915/icl_dsi.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
> index 92440ff..4aef5dd 100644
> --- a/drivers/gpu/drm/i915/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/icl_dsi.c
> @@ -589,6 +589,12 @@ static void gen11_dsi_map_pll(struct intel_encoder *encoder,
>  		val |= DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, port);
>  	}
>  	I915_WRITE(DPCLKA_CFGCR0_ICL, val);
> +
> +	for_each_dsi_port(port, intel_dsi->ports) {
> +		val &= ~DPCLKA_CFGCR0_DDI_CLK_OFF(port);
> +	}
> +	I915_WRITE(DPCLKA_CFGCR0_ICL, val);
> +
>  	POSTING_READ(DPCLKA_CFGCR0_ICL);
>  
>  	mutex_unlock(&dev_priv->dpll_lock);

-- 
Jani Nikula, Intel Open Source Graphics Center