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[16/18] drm/i915/skl: Do not disable cdclk PLL if csr firmware is present.

Message ID 1437850839-16782-17-git-send-email-animesh.manna@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Manna, Animesh July 25, 2015, 7 p.m. UTC 
While display engine entering into low power state no need to disable
cdclk pll as CSR firmware of dmc will take care. If pll is already
enabled firmware execution sequence will be blocked. This is one
of the criteria for dmc to work properly.

Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Sunil Kamath <sunil.kamath@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-bt: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

Comments

Kamath, Sunil July 30, 2015, 7:04 a.m. UTC | #1 
On Sunday 26 July 2015 12:30 AM, Animesh Manna wrote:
> While display engine entering into low power state no need to disable
> cdclk pll as CSR firmware of dmc will take care. If pll is already
> enabled firmware execution sequence will be blocked. This is one
> of the criteria for dmc to work properly.
>
> Cc: Damien Lespiau <damien.lespiau@intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Sunil Kamath <sunil.kamath@intel.com>
> Signed-off-by: Animesh Manna <animesh.manna@intel.com>
> Signed-off-bt: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
> ---
>   drivers/gpu/drm/i915/intel_display.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index af0bcfe..ef2ef4d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5675,10 +5675,13 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
>   	if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
>   		DRM_ERROR("DBuf power disable timeout\n");
>   
> -	/* disable DPLL0 */
> -	I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) & ~LCPLL_PLL_ENABLE);
> -	if (wait_for(!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_LOCK), 1))
> -		DRM_ERROR("Couldn't disable DPLL0\n");
> +	if (dev_priv->csr.dmc_payload) {
> +		/* disable DPLL0 */
> +		I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) &
> +					~LCPLL_PLL_ENABLE);
> +		if (wait_for(!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_LOCK), 1))
> +			DRM_ERROR("Couldn't disable DPLL0\n");
> +	}
>   
>   	intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS);
>   }
This is a right bug fix.

Reviewed-by: A.Sunil Kamath <sunil.kamath@intel.com>
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index af0bcfe..ef2ef4d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5675,10 +5675,13 @@  void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
 	if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
 		DRM_ERROR("DBuf power disable timeout\n");
 
-	/* disable DPLL0 */
-	I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) & ~LCPLL_PLL_ENABLE);
-	if (wait_for(!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_LOCK), 1))
-		DRM_ERROR("Couldn't disable DPLL0\n");
+	if (dev_priv->csr.dmc_payload) {
+		/* disable DPLL0 */
+		I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) &
+					~LCPLL_PLL_ENABLE);
+		if (wait_for(!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_LOCK), 1))
+			DRM_ERROR("Couldn't disable DPLL0\n");
+	}
 
 	intel_display_power_put(dev_priv, POWER_DOMAIN_PLLS);
 }