Re: [BXT MIPI PATCH 1/2] drm/i915: Set the Z inversion overlap field for BXT

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

On Wed, Dec 09, 2015 at 05:29:57PM +0530, Deepak M wrote:
> For broxton dual link Z-inversion overlap field is present
> in MIPI_CTRL register unlike the other platforms, hence
> setting the same in this patch.
> 
> Signed-off-by: Deepak M <m.deepak@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h  |  4 ++++
>  drivers/gpu/drm/i915/intel_dsi.c | 16 +++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 009f474..fa72be9 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8107,6 +8107,10 @@ enum skl_disp_power_wells {
>  #define  BXT_PIPE_SELECT_B				(1 << 7)
>  #define  BXT_PIPE_SELECT_A				(0 << 7)
>  
> +/* BXT has dual link Z inversion overlap field */
> +#define  BXT_PIXEL_OVERLAP_CNT_MASK			(0xf << 10)
> +#define  BXT_PIXEL_OVERLAP_CNT_SHIFT			10

This could be parametrized. eg:
BXT_PIXEL_OVERLAP_CNT(x) ((x) << 10))

And so could the VLV version.

> +
>  #define _MIPIA_DATA_ADDRESS		(dev_priv->mipi_mmio_base + 0xb108)
>  #define _MIPIC_DATA_ADDRESS		(dev_priv->mipi_mmio_base + 0xb908)
>  #define MIPI_DATA_ADDRESS(port)		_MIPI_PORT(port, _MIPIA_DATA_ADDRESS, \
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index eff982b..f5df49b 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -392,11 +392,21 @@ static void intel_dsi_port_enable(struct intel_encoder *encoder)
>  	u32 port_ctrl;
>  
>  	if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
> -		temp = I915_READ(VLV_CHICKEN_3);
> -		temp &= ~PIXEL_OVERLAP_CNT_MASK |
> +		if (IS_BROXTON(dev)) {
> +			for_each_dsi_port(port, intel_dsi->ports) {
> +				temp = I915_READ(MIPI_CTRL(port));
> +				temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
>  					intel_dsi->pixel_overlap <<
> +					BXT_PIXEL_OVERLAP_CNT_SHIFT;

That won't do anything sane.

> +				I915_WRITE(MIPI_CTRL(port), temp);
> +			}
> +		} else {
> +			temp = I915_READ(VLV_CHICKEN_3);
> +			temp &= ~PIXEL_OVERLAP_CNT_MASK |
> +				intel_dsi->pixel_overlap <<
>  					PIXEL_OVERLAP_CNT_SHIFT;
> -		I915_WRITE(VLV_CHICKEN_3, temp);
> +			I915_WRITE(VLV_CHICKEN_3, temp);
> +		}
>  	}
>  
>  	for_each_dsi_port(port, intel_dsi->ports) {
> -- 
> 1.9.1
> 
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-- 
Ville Syrjälä
Intel OTC
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