Re: [PATCH 3/6] drm/i915/glk: Implement WaDDIIOTimeout

[Imre Deak <imre.deak@intel.com>]

On Fri, Feb 10, 2017 at 03:29:56PM +0200, Ander Conselvan de Oliveira wrote:
> Implement WaDDIIOTimeout to avoid a timeout when enabling the DDI IO
> power domains.
> 
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>

Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.h |  6 ++++++
>  drivers/gpu/drm/i915/i915_reg.h |  5 +++++
>  drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++++
>  3 files changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index ceb7699..bfccf9d 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2774,6 +2774,12 @@ intel_info(const struct drm_i915_private *dev_priv)
>  #define IS_KBL_REVID(dev_priv, since, until) \
>  	(IS_KABYLAKE(dev_priv) && IS_REVID(dev_priv, since, until))
>  
> +#define GLK_REVID_A0		0x0
> +#define GLK_REVID_A1		0x1
> +
> +#define IS_GLK_REVID(dev_priv, since, until) \
> +	(IS_GEMINILAKE(dev_priv) && IS_REVID(dev_priv, since, until))
> +
>  /*
>   * The genX designation typically refers to the render engine, so render
>   * capability related checks should use IS_GEN, while display and other checks
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 141a5c1..ce6f096 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6495,6 +6495,11 @@ enum {
>  #define CHICKEN_PAR2_1		_MMIO(0x42090)
>  #define  KVM_CONFIG_CHANGE_NOTIFICATION_SELECT	(1 << 14)
>  
> +#define CHICKEN_MISC_2		_MMIO(0x42084)
> +#define  GLK_CL0_PWR_DOWN	(1 << 10)
> +#define  GLK_CL1_PWR_DOWN	(1 << 11)
> +#define  GLK_CL2_PWR_DOWN	(1 << 12)
> +
>  #define _CHICKEN_PIPESL_1_A	0x420b0
>  #define _CHICKEN_PIPESL_1_B	0x420b4
>  #define  HSW_FBCQ_DIS			(1 << 22)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index c0b0f5a..6f2a95f 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -115,6 +115,16 @@ static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
>  	 */
>  	I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) |
>  		   PWM1_GATING_DIS | PWM2_GATING_DIS);
> +
> +	/* WaDDIIOTimeout:glk */
> +	if (IS_GLK_REVID(dev_priv, 0, GLK_REVID_A1)) {
> +		u32 val = I915_READ(CHICKEN_MISC_2);
> +		val &= ~(GLK_CL0_PWR_DOWN |
> +			 GLK_CL1_PWR_DOWN |
> +			 GLK_CL2_PWR_DOWN);
> +		I915_WRITE(CHICKEN_MISC_2, val);
> +	}
> +
>  }
>  
>  static void i915_pineview_get_mem_freq(struct drm_i915_private *dev_priv)
> -- 
> 2.9.3
> 
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