[Intel-gfx] [PATCH 09/23] drm/i915/mtl: Add support for MTL in Display Init sequences

[Matt Roper]

On Wed, Jul 27, 2022 at 06:34:06PM -0700, Radhakrishna Sripada wrote:
> The initialization sequence for Meteorlake reuses the sequence for
> icelake for most parts. Some changes viz. reset PICA handshake
> are added.
> 
> Bspec: 49189
> 
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_display_power.c | 3 +++
>  drivers/gpu/drm/i915/i915_reg.h                    | 3 ++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 589af257edeb..ccc3f78b1607 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -1381,6 +1381,9 @@ static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv,
>  		reset_bits = RESET_PCH_HANDSHAKE_ENABLE;
>  	}
>  
> +	if (DISPLAY_VER(dev_priv) >= 14)
> +		reset_bits |= MTL_RESET_PICA_HANDSHAKE_EN;
> +
>  	val = intel_de_read(dev_priv, reg);
>  
>  	if (enable)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 50ddc5ba72b9..baf747adf1db 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5926,7 +5926,8 @@
>  							 _BW_BUDDY1_PAGE_MASK))
>  
>  #define HSW_NDE_RSTWRN_OPT	_MMIO(0x46408)
> -#define  RESET_PCH_HANDSHAKE_ENABLE	(1 << 4)
> +#define  MTL_RESET_PICA_HANDSHAKE_EN	REG_BIT(6)
> +#define  RESET_PCH_HANDSHAKE_ENABLE	REG_BIT(4)
>  
>  #define GEN8_CHICKEN_DCPR_1			_MMIO(0x46430)
>  #define   SKL_SELECT_ALTERNATE_DC_EXIT		REG_BIT(30)
> -- 
> 2.25.1
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation