Re: [PATCH] drm/i915: dual link pipe selection for bxt

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, Dec 09, 2015 at 08:14:04PM +0530, Deepak M wrote:
> Pipe is assigned based on the port, but it should be
> based on current crtc. Correcting the same in this patch.
> 
> v2: Use macro BXT_PIPE_SELECT(pipe) (Daniel)
> 
> Signed-off-by: Deepak M <m.deepak@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h  |  4 +---
>  drivers/gpu/drm/i915/intel_dsi.c | 15 +++------------
>  2 files changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index fa72be9..91dbb32 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8103,9 +8103,7 @@ enum skl_disp_power_wells {
>  #define  RGB_FLIP_TO_BGR				(1 << 2)
>  
>  #define  BXT_PIPE_SELECT_MASK				(7 << 7)
> -#define  BXT_PIPE_SELECT_C				(2 << 7)
> -#define  BXT_PIPE_SELECT_B				(1 << 7)
> -#define  BXT_PIPE_SELECT_A				(0 << 7)
> +#define  BXT_PIPE_SELECT(pipe)				((pipe) << 7)
>  
>  /* BXT has dual link Z inversion overlap field */
>  #define  BXT_PIXEL_OVERLAP_CNT_MASK			(0xf << 10)
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index f5df49b..12cfcf5 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -898,21 +898,12 @@ static void intel_dsi_prepare(struct intel_encoder *intel_encoder)
>  			I915_WRITE(MIPI_CTRL(port), tmp |
>  					READ_REQUEST_PRIORITY_HIGH);
>  		} else if (IS_BROXTON(dev)) {
> -			/*
> -			 * FIXME:
> -			 * BXT can connect any PIPE to any MIPI port.
> -			 * Select the pipe based on the MIPI port read from
> -			 * VBT for now. Pick PIPE A for MIPI port A and C
> -			 * for port C.
> -			 */
> +			enum pipe pipe = intel_crtc->pipe;
> +
>  			tmp = I915_READ(MIPI_CTRL(port));
>  			tmp &= ~BXT_PIPE_SELECT_MASK;
>  
> -			if (port == PORT_A)
> -				tmp |= BXT_PIPE_SELECT_A;
> -			else if (port == PORT_C)
> -				tmp |= BXT_PIPE_SELECT_C;
> -
> +			tmp |= BXT_PIPE_SELECT(pipe);
>  			I915_WRITE(MIPI_CTRL(port), tmp);

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

There's way too much RMW going on in the DSI code though. Someone should
probably do something about it.

>  		}
>  
> -- 
> 1.9.1
> 
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-- 
Ville Syrjälä
Intel OTC
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