Re: [PATCH 1/2] drm/i915/BXT: Fixed COS blanking issue

["Thulasimani, Sivakumar" <sivakumar.thulasimani@intel.com>]

On 2/2/2016 11:24 PM, Ramalingam C wrote:
> From: Uma Shankar <uma.shankar@intel.com>
>
> During Charging OS mode, mipi display was blanking.This is
> because during driver load, though encoder, connector were
> active but crtc returned inactive. This caused sanitize
> function to disable the DSI panel. In AOS, this is fine
> since HWC will do a modeset and crtc, connector, encoder
> mapping will be restored. But in COS, no modeset is called,
> it just calls DPMS ON/OFF.
>
> This is fine on BYT/CHT since transcoder is common b/w
> all encoders. But for BXT, there is a separate mipi
> transcoder. Hence this needs special handling for BXT.
>
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>   drivers/gpu/drm/i915/intel_display.c |  107 ++++++++++++++++++++++++++++++++--
>   1 file changed, 101 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a66220a..f8685f5 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7814,6 +7814,69 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc)
>   		   (intel_crtc->config->pipe_src_h - 1));
>   }
>   
> +static void intel_get_dsi_pipe_timings(struct intel_crtc *crtc,
> +				   struct intel_crtc_state *pipe_config)
> +{
> +	struct drm_device *dev = crtc->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
> +	struct intel_encoder *encoder;
> +	uint32_t tmp;
> +
> +	tmp = I915_READ(HTOTAL(cpu_transcoder));
> +	pipe_config->base.adjusted_mode.crtc_hdisplay = (tmp & 0xffff) + 1;
> +	pipe_config->base.adjusted_mode.crtc_htotal =
> +						((tmp >> 16) & 0xffff) + 1;
> +	tmp = I915_READ(HBLANK(cpu_transcoder));
> +	pipe_config->base.adjusted_mode.crtc_hblank_start = (tmp & 0xffff) + 1;
> +	pipe_config->base.adjusted_mode.crtc_hblank_end =
> +						((tmp >> 16) & 0xffff) + 1;
> +	tmp = I915_READ(HSYNC(cpu_transcoder));
> +	pipe_config->base.adjusted_mode.crtc_hsync_start = (tmp & 0xffff) + 1;
> +	pipe_config->base.adjusted_mode.crtc_hsync_end =
> +						((tmp >> 16) & 0xffff) + 1;
> +
> +	tmp = I915_READ(VBLANK(cpu_transcoder));
> +	pipe_config->base.adjusted_mode.crtc_vblank_start = (tmp & 0xffff) + 1;
> +	pipe_config->base.adjusted_mode.crtc_vblank_end =
> +						((tmp >> 16) & 0xffff) + 1;
> +	tmp = I915_READ(VSYNC(cpu_transcoder));
> +	pipe_config->base.adjusted_mode.crtc_vsync_start = (tmp & 0xffff) + 1;
> +	pipe_config->base.adjusted_mode.crtc_vsync_end =
> +						((tmp >> 16) & 0xffff) + 1;
> +
> +	if (I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_INTERLACE_MASK) {
> +		pipe_config->base.adjusted_mode.flags |=
> +						DRM_MODE_FLAG_INTERLACE;
> +		pipe_config->base.adjusted_mode.crtc_vtotal += 1;
> +		pipe_config->base.adjusted_mode.crtc_vblank_end += 1;
> +	}
> +
> +
> +	for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
> +		struct intel_dsi *intel_dsi =
> +			enc_to_intel_dsi(&encoder->base);
> +		enum port port;
> +
> +		pipe_config->pipe_bpp = intel_dsi->dsi_bpp;
> +		for_each_dsi_port(port, intel_dsi->ports) {
> +			pipe_config->base.adjusted_mode.crtc_hdisplay =
> +				I915_READ(BXT_MIPI_TRANS_HACTIVE(port));
> +			pipe_config->base.adjusted_mode.crtc_vdisplay =
> +				I915_READ(BXT_MIPI_TRANS_VACTIVE(port));
> +			pipe_config->base.adjusted_mode.crtc_vtotal =
> +				I915_READ(BXT_MIPI_TRANS_VTOTAL(port));
> +		}
> +	}
> +
> +	tmp = I915_READ(PIPESRC(crtc->pipe));
> +	pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
> +	pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;
> +
> +	pipe_config->base.mode.vdisplay = pipe_config->pipe_src_h;
> +	pipe_config->base.mode.hdisplay = pipe_config->pipe_src_w;
> +}
> +
>   static void intel_get_pipe_timings(struct intel_crtc *crtc,
>   				   struct intel_crtc_state *pipe_config)
>   {
> @@ -9969,6 +10032,7 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>   	struct drm_i915_private *dev_priv = dev->dev_private;
>   	enum intel_display_power_domain pfit_domain;
>   	uint32_t tmp;
> +	bool is_dsi = false;
>   
>   	if (!intel_display_power_is_enabled(dev_priv,
>   					 POWER_DOMAIN_PIPE(crtc->pipe)))
> @@ -9999,17 +10063,48 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>   			pipe_config->cpu_transcoder = TRANSCODER_EDP;
>   	}
>   
> +	if (dev_priv->vbt.has_mipi) {
shouldn't the above check for bxt too ? since the section inside is only 
for bxt ?
regards,
Sivakumar
> +		enum port port_num = (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA)
> +					? PORT_A : PORT_C;
> +		uint32_t dsi_ctrl = I915_READ(MIPI_CTRL(port_num));
> +
> +		tmp = I915_READ(BXT_MIPI_PORT_CTRL(port_num));
> +		if (tmp & DPI_ENABLE) {
> +			enum pipe trans_dsi_pipe;
> +
> +			switch (dsi_ctrl & BXT_PIPE_SELECT_MASK) {
> +			default:
> +				WARN(1, "unknown pipe linked to dsi transcoder\n");
> +				return false;
> +			case BXT_PIPE_SELECT_A:
> +				trans_dsi_pipe = PIPE_A;
> +				break;
> +			case BXT_PIPE_SELECT_B:
> +				trans_dsi_pipe = PIPE_B;
> +				break;
> +			case BXT_PIPE_SELECT_C:
> +				trans_dsi_pipe = PIPE_C;
> +				break;
> +			}
> +
> +			if (trans_dsi_pipe == crtc->pipe)
> +				is_dsi = true;
> +		}
> +	}
> +
>   	if (!intel_display_power_is_enabled(dev_priv,
>   			POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
>   		return false;
>   
> -	tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
> -	if (!(tmp & PIPECONF_ENABLE))
> -		return false;
> -
> -	haswell_get_ddi_port_state(crtc, pipe_config);
> +	if (!is_dsi) {
> +		tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
> +		if (!(tmp & PIPECONF_ENABLE))
> +			return false;
>   
> -	intel_get_pipe_timings(crtc, pipe_config);
> +		haswell_get_ddi_port_state(crtc, pipe_config);
> +		intel_get_pipe_timings(crtc, pipe_config);
> +	} else
> +		intel_get_dsi_pipe_timings(crtc, pipe_config);
>   
>   	if (INTEL_INFO(dev)->gen >= 9) {
>   		skl_init_scalers(dev, crtc, pipe_config);

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