[Intel-gfx] [PATCH v4 27/49] drm/i915/bxt: Enable GMBUS IRQ

[Jani Nikula]

On Fri, 10 Apr 2015, Imre Deak <imre.deak at intel.com> wrote:
> From: Shashank Sharma <shashank.sharma at intel.com>
>
> GMBUS interrupt has been moved to CPU side in BXT.
> What this patch does is:
> 1. Enable GMBUS IRQ in de_post_install function
> 2. Handle this interrupt as a port interrupt in display irq
>    handler
>
> v2: Rebase on top of the for_each_pipe() change adding dev_priv as
>     first argument (Damien).
> v3: read BXT_DE_PORT_GMBUS IIR flag only on BXT on other platforms
>     it's reserved (imre)
> v4: (jani)
> - remove redundant 'BXT GMBUS' comment
> - fix formatting of BXT_DE_PORT_GMBUS definition
>
> Reviewed-by: Satheeshakrishna M <satheeshakrishna.m at intel.com>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com> (v1)
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>

Yup. ^

> ---
>  drivers/gpu/drm/i915/i915_irq.c | 14 +++++++++++---
>  drivers/gpu/drm/i915/i915_reg.h |  1 +
>  2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a185f44..5417d5a 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2244,6 +2244,11 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
>  				found = true;
>  			}
>  
> +			if (IS_BROXTON(dev) && (tmp & BXT_DE_PORT_GMBUS)) {
> +				gmbus_irq_handler(dev);
> +				found = true;
> +			}
> +
>  			if (!found)
>  				DRM_ERROR("Unexpected DE Port interrupt\n");
>  		}
> @@ -3518,13 +3523,16 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>  	uint32_t de_pipe_masked = GEN8_PIPE_CDCLK_CRC_DONE;
>  	uint32_t de_pipe_enables;
>  	int pipe;
> -	u32 aux_en = GEN8_AUX_CHANNEL_A;
> +	u32 de_port_en = GEN8_AUX_CHANNEL_A;
>  
>  	if (IS_GEN9(dev_priv)) {
>  		de_pipe_masked |= GEN9_PIPE_PLANE1_FLIP_DONE |
>  				  GEN9_DE_PIPE_IRQ_FAULT_ERRORS;
> -		aux_en |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C |
> +		de_port_en |= GEN9_AUX_CHANNEL_B | GEN9_AUX_CHANNEL_C |
>  			GEN9_AUX_CHANNEL_D;
> +
> +		if (IS_BROXTON(dev_priv))
> +			de_port_en |= BXT_DE_PORT_GMBUS;
>  	} else
>  		de_pipe_masked |= GEN8_PIPE_PRIMARY_FLIP_DONE |
>  				  GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
> @@ -3543,7 +3551,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
>  					  dev_priv->de_irq_mask[pipe],
>  					  de_pipe_enables);
>  
> -	GEN5_IRQ_INIT(GEN8_DE_PORT_, ~aux_en, aux_en);
> +	GEN5_IRQ_INIT(GEN8_DE_PORT_, ~de_port_en, de_port_en);
>  }
>  
>  static int gen8_irq_postinstall(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 670a9d4..4950aa4 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5266,6 +5266,7 @@ enum skl_disp_power_wells {
>  					 BXT_DE_PORT_HP_DDIB | \
>  					 BXT_DE_PORT_HP_DDIC)
>  #define  GEN8_PORT_DP_A_HOTPLUG		(1 << 3)
> +#define  BXT_DE_PORT_GMBUS		(1 << 1)
>  #define  GEN8_AUX_CHANNEL_A		(1 << 0)
>  
>  #define GEN8_DE_MISC_ISR 0x44460
> -- 
> 1.9.1
>

-- 
Jani Nikula, Intel Open Source Technology Center