Re: [PATCH 4/9] drm/i915: Don't touch South display when PCH_NOP

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 13 Mar 2013, Ben Widawsky <ben@bwidawsk.net> wrote:
> Interrupts, clock gating, and gmbus are all within the, "this will hang
> the CPU" range when we have PCH_NOP.
>
> There is a bit of a hack in init clock gating. We want to do most of the
> block gating, but the part we skip will hang the system. It could
> probably be abstracted a bit better, but I don't feel it's too
> unsightly.
>
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
> ---
>  drivers/gpu/drm/i915/i915_irq.c   | 20 ++++++++++++++------
>  drivers/gpu/drm/i915/intel_bios.c |  3 +++
>  drivers/gpu/drm/i915/intel_i2c.c  |  4 +++-
>  drivers/gpu/drm/i915/intel_pm.c   |  3 ++-
>  4 files changed, 22 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index b860f0b..ba8ada3 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -738,14 +738,16 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
>  			}
>  		}
>  
> -		/* check event from PCH */
> -		if (de_iir & DE_PCH_EVENT_IVB) {
> -			u32 pch_iir = I915_READ(SDEIIR);
> +		if (HAS_PCH_NOP(dev)) {

!HAS_PCH_NOP() ?

BR,
Jani.

> +			/* check event from PCH */
> +			if (de_iir & DE_PCH_EVENT_IVB) {
> +				u32 pch_iir = I915_READ(SDEIIR);
>  
> -			cpt_irq_handler(dev, pch_iir);
> +				cpt_irq_handler(dev, pch_iir);
>  
> -			/* clear PCH hotplug event before clear CPU irq */
> -			I915_WRITE(SDEIIR, pch_iir);
> +				/* clear PCH hotplug event before CPU irq */
> +				I915_WRITE(SDEIIR, pch_iir);
> +			}
>  		}
>  
>  		I915_WRITE(DEIIR, de_iir);
> @@ -1910,6 +1912,9 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
>  	I915_WRITE(GTIER, 0x0);
>  	POSTING_READ(GTIER);
>  
> +	if (HAS_PCH_NOP(dev))
> +		return;
> +
>  	/* south display irq */
>  	I915_WRITE(SDEIMR, 0xffffffff);
>  	I915_WRITE(SDEIER, 0x0);
> @@ -1982,6 +1987,9 @@ static void ibx_irq_postinstall(struct drm_device *dev)
>  		       SDE_GMBUS_CPT |
>  		       SDE_AUX_MASK_CPT;
>  
> +	if (HAS_PCH_NOP(dev))
> +		return;
> +
>  	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
>  	I915_WRITE(SDEIMR, ~mask);
>  	I915_WRITE(SDEIER, mask);
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 55ffba1..194df27 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -692,6 +692,9 @@ intel_parse_bios(struct drm_device *dev)
>  	struct bdb_header *bdb = NULL;
>  	u8 __iomem *bios = NULL;
>  
> +	if (HAS_PCH_NOP(dev))
> +		return -ENODEV;
> +
>  	init_vbt_defaults(dev_priv);
>  
>  	/* XXX Should this validation be moved to intel_opregion.c? */
> diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
> index acf8aec..fc19e49 100644
> --- a/drivers/gpu/drm/i915/intel_i2c.c
> +++ b/drivers/gpu/drm/i915/intel_i2c.c
> @@ -513,7 +513,9 @@ int intel_setup_gmbus(struct drm_device *dev)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int ret, i;
>  
> -	if (HAS_PCH_SPLIT(dev))
> +	if (HAS_PCH_NOP(dev))
> +		return 0;
> +	else if (HAS_PCH_SPLIT(dev))
>  		dev_priv->gpio_mmio_base = PCH_GPIOA - GPIOA;
>  	else if (IS_VALLEYVIEW(dev))
>  		dev_priv->gpio_mmio_base = VLV_DISPLAY_BASE;
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 5479363..52203fd 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3874,7 +3874,8 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
>  	snpcr |= GEN6_MBC_SNPCR_MED;
>  	I915_WRITE(GEN6_MBCUNIT_SNPCR, snpcr);
>  
> -	cpt_init_clock_gating(dev);
> +	if (HAS_PCH_NOP(dev))
> +		cpt_init_clock_gating(dev);
>  
>  	gen6_check_mch_setup(dev);
>  }
> -- 
> 1.8.1.5
>
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