Re: [PATCH 2/2] drm/i915/BXT: Get pipe conf from the port registers

[Jani Nikula <jani.nikula@intel.com>]

On Thu, 07 Apr 2016, Ramalingam C <ramalingam.c@intel.com> wrote:
> At BXT DSI, PIPE registers are inactive. So we can't get the
> PIPE's mode parameters from them. The possible option is
> retriving them from the PORT registers.
>
> The required changes are added for BXT in intel_dsi_get_config
> (encoder->get_config).
>
> v2: Addressed the Jani's comments
>     -removed the redundant call to encoder->get_config
>     -read bpp from port register
>     -removed retrival of src_size from encoder->get_config
>
> v3: pipe_config->pipe_bpp is fixed
>     Jani's review comments addressed:
> 	Few horizontal timing parameters dropped from the patch to make
> 	progress, as there seems to be some disagreement on
> 	best/feasible/possible options.
>
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
>
> Previously Reviewed at: https://lists.freedesktop.org/archives/intel-gfx/2016-April/091737.html

Both pushed to drm-intel-next-queued, thanks for the patches.

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/intel_dsi.c |   60 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 60 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index a0f374f..a1e0547 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -758,14 +758,74 @@ out_put_power:
>  	return active;
>  }
>  
> +static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
> +				 struct intel_crtc_state *pipe_config)
> +{
> +	struct drm_device *dev = encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct drm_display_mode *adjusted_mode =
> +					&pipe_config->base.adjusted_mode;
> +	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> +	unsigned int bpp, fmt;
> +	enum port port;
> +	u16 vfp, vsync, vbp;
> +
> +	/*
> +	 * Atleast one port is active as encoder->get_config called only if
> +	 * encoder->get_hw_state() returns true.
> +	 */
> +	for_each_dsi_port(port, intel_dsi->ports) {
> +		if (I915_READ(BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
> +			break;
> +	}
> +
> +	fmt = I915_READ(MIPI_DSI_FUNC_PRG(port)) & VID_MODE_FORMAT_MASK;
> +	pipe_config->pipe_bpp =
> +			mipi_dsi_pixel_format_to_bpp(
> +				pixel_format_from_register_bits(fmt));
> +	bpp = pipe_config->pipe_bpp;
> +
> +	/* In terms of pixels */
> +	adjusted_mode->crtc_hdisplay =
> +				I915_READ(BXT_MIPI_TRANS_HACTIVE(port));
> +	adjusted_mode->crtc_vdisplay =
> +				I915_READ(BXT_MIPI_TRANS_VACTIVE(port));
> +	adjusted_mode->crtc_vtotal =
> +				I915_READ(BXT_MIPI_TRANS_VTOTAL(port));
> +
> +	/*
> +	 * TODO: Retrieve hfp, hsync and hbp. Adjust them for dual link and
> +	 * calculate hsync_start, hsync_end, htotal and hblank_end
> +	 */
> +
> +	/* vertical values are in terms of lines */
> +	vfp = I915_READ(MIPI_VFP_COUNT(port));
> +	vsync = I915_READ(MIPI_VSYNC_PADDING_COUNT(port));
> +	vbp = I915_READ(MIPI_VBP_COUNT(port));
> +
> +	adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
> +
> +	adjusted_mode->crtc_vsync_start =
> +				vfp + adjusted_mode->crtc_vdisplay;
> +	adjusted_mode->crtc_vsync_end =
> +				vsync + adjusted_mode->crtc_vsync_start;
> +	adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
> +	adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
> +}
> +
> +
>  static void intel_dsi_get_config(struct intel_encoder *encoder,
>  				 struct intel_crtc_state *pipe_config)
>  {
> +	struct drm_device *dev = encoder->base.dev;
>  	u32 pclk;
>  	DRM_DEBUG_KMS("\n");
>  
>  	pipe_config->has_dsi_encoder = true;
>  
> +	if (IS_BROXTON(dev))
> +		bxt_dsi_get_pipe_config(encoder, pipe_config);
> +
>  	/*
>  	 * DPLL_MD is not used in case of DSI, reading will get some default value
>  	 * set dpll_md = 0

-- 
Jani Nikula, Intel Open Source Technology Center
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