Re: [PATCH 2/5] drm/i915: retrieve current fb config into new plane_config structure at init

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

On Wed, Nov 13, 2013 at 10:20:45AM -0800, Jesse Barnes wrote:
> Read out the current plane configuration at init time into a new
> plane_config structure.  This allows us to track any existing
> framebuffers attached to the plane and potentially re-use them in our
> fbdev code for a smooth handoff.
> 
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_drv.h      |   3 +
>  drivers/gpu/drm/i915/intel_display.c | 113 ++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_drv.h     |  14 +++++
>  3 files changed, 128 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 4377523..db6821a 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -364,6 +364,7 @@ struct drm_i915_error_state {
>  };
>  
>  struct intel_crtc_config;
> +struct intel_plane_config;
>  struct intel_crtc;
>  struct intel_limit;
>  struct dpll;
> @@ -402,6 +403,8 @@ struct drm_i915_display_funcs {
>  	 * fills out the pipe-config with the hw state. */
>  	bool (*get_pipe_config)(struct intel_crtc *,
>  				struct intel_crtc_config *);
> +	void (*get_plane_config)(struct intel_crtc *,
> +				 struct intel_plane_config *);
>  	int (*crtc_mode_set)(struct drm_crtc *crtc,
>  			     int x, int y,
>  			     struct drm_framebuffer *old_fb);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index d4cc00c..c3c4fc3 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2002,6 +2002,27 @@ unsigned long intel_gen4_compute_page_offset(int *x, int *y,
>  	}
>  }
>  
> +int intel_format_to_fourcc(int format)
> +{
> +	switch (format) {
> +	case DISPPLANE_8BPP:
> +		return DRM_FORMAT_C8;
> +	case DISPPLANE_BGRX555:
> +		return DRM_FORMAT_ARGB1555;
                                  ^
X

> +	case DISPPLANE_BGRX565:
> +		return DRM_FORMAT_RGB565;
> +	default:
> +	case DISPPLANE_BGRX888:
> +		return DRM_FORMAT_XRGB8888;
> +	case DISPPLANE_RGBX888:
> +		return DRM_FORMAT_XBGR8888;
> +	case DISPPLANE_BGRX101010:
> +		return DRM_FORMAT_XRGB2101010;
> +	case DISPPLANE_RGBX101010:
> +		return DRM_FORMAT_XBGR2101010;
> +	}
> +}
> +
>  static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  			     int x, int y)
>  {
> @@ -5463,6 +5484,81 @@ intel_framebuffer_pitch_for_width(int width, int bpp, bool tiled)
>  		return ALIGN(pitch, 64);
>  }
>  
> +static void i9xx_get_plane_config(struct intel_crtc *crtc,
> +				  struct intel_plane_config *plane_config)
> +{
> +	struct drm_device *dev = crtc->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	int pipe = crtc->pipe, plane = crtc->plane;
> +	u32 val;
> +
> +	val = I915_READ(DSPCNTR(plane));
> +
> +	if (INTEL_INFO(dev)->gen >= 4)
> +		if (val & DISPPLANE_TILED)
> +			plane_config->tiled = true;
> +
> +	plane_config->pixel_format = val & DISPPLANE_PIXFORMAT_MASK;
> +
> +	switch (plane_config->pixel_format) {
> +	case DISPPLANE_8BPP:
> +	case DISPPLANE_YUV422:
> +		plane_config->bpp = 8;
> +		break;
> +	case DISPPLANE_BGRX555:
> +	case DISPPLANE_BGRX565:
> +	case DISPPLANE_BGRA555:
> +		plane_config->bpp = 16;
> +		break;
> +	case DISPPLANE_BGRX888:
> +	case DISPPLANE_BGRA888:
> +	case DISPPLANE_RGBX888:
> +	case DISPPLANE_RGBA888:
> +	case DISPPLANE_RGBX101010:
> +	case DISPPLANE_RGBA101010:
> +	case DISPPLANE_BGRX101010:
> +		plane_config->bpp = 32;
> +		break;
> +	}

Maybe just intel_format_to_fourcc()+drm_format_plane_cpp() or something.
Just to avoid duplicating essentially the same code.

> +
> +	if (INTEL_INFO(dev)->gen >= 4) {
> +		if (plane_config->tiled)
> +			plane_config->offset = I915_READ(DSPTILEOFF(plane));
> +		else
> +			plane_config->offset = I915_READ(DSPLINOFF(plane));
> +		plane_config->base = I915_READ(DSPSURF(plane)) & 0xfffff000;
> +	} else {
> +		plane_config->base = I915_READ(DSPADDR(plane));
> +	}
> +
> +	val = I915_READ(PIPESRC(pipe));
> +	plane_config->pipe_width = ((val >> 16) & 0xfff) + 1;
> +	plane_config->pipe_height = ((val >> 0) & 0xfff) + 1;
> +
> +	val = I915_READ(HTOTAL(pipe));
> +	plane_config->fb_width = (val & 0xffff) + 1;
> +	val = I915_READ(VTOTAL(pipe));
> +	plane_config->fb_height = (val & 0xffff) + 1;

Why make the fb the size of htotal/vtotal? pipe src size should be all
we need.

> +
> +	DRM_DEBUG_KMS("pipe/plane %d/%d with fb: size=%dx%d@%d, offset=%x\n",
> +		      pipe, plane, plane_config->fb_width,
> +		      plane_config->fb_height, plane_config->bpp,
> +		      plane_config->base);
> +
> +	plane_config->pitch =
> +		intel_framebuffer_pitch_for_width(plane_config->fb_width,
> +						  plane_config->bpp,
> +						  plane_config->tiled);
> +
> +	plane_config->size = ALIGN(plane_config->pitch *
> +				   plane_config->fb_height, PAGE_SIZE);
> +	plane_config->obj =
> +		i915_gem_object_create_stolen_for_preallocated(dev,
> +							       plane_config->base,
> +							       plane_config->base,
> +							       plane_config->size);
> +}
> +
>  static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
>  				 struct intel_crtc_config *pipe_config)
>  {
> @@ -10523,6 +10619,7 @@ static void intel_init_display(struct drm_device *dev)
>  		dev_priv->display.update_plane = ironlake_update_plane;
>  	} else if (IS_VALLEYVIEW(dev)) {
>  		dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
> +		dev_priv->display.get_plane_config = i9xx_get_plane_config;
>  		dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
>  		dev_priv->display.crtc_enable = valleyview_crtc_enable;
>  		dev_priv->display.crtc_disable = i9xx_crtc_disable;
> @@ -10530,6 +10627,7 @@ static void intel_init_display(struct drm_device *dev)
>  		dev_priv->display.update_plane = i9xx_update_plane;
>  	} else {
>  		dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
> +		dev_priv->display.get_plane_config = i9xx_get_plane_config;
>  		dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
>  		dev_priv->display.crtc_enable = i9xx_crtc_enable;
>  		dev_priv->display.crtc_disable = i9xx_crtc_disable;
> @@ -10798,6 +10896,7 @@ void intel_modeset_suspend_hw(struct drm_device *dev)
>  void intel_modeset_init(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *crtc;
>  	int i, j, ret;
>  
>  	drm_mode_config_init(dev);
> @@ -10854,6 +10953,18 @@ void intel_modeset_init(struct drm_device *dev)
>  
>  	/* Just in case the BIOS is doing something questionable. */
>  	intel_disable_fbc(dev);
> +
> +	intel_modeset_setup_hw_state(dev, false);
> +
> +	list_for_each_entry(crtc, &dev->mode_config.crtc_list,
> +			    base.head) {
> +		if (!crtc->active)
> +			continue;
> +
> +		if (dev_priv->display.get_plane_config)
> +			dev_priv->display.get_plane_config(crtc,
> +							   &crtc->plane_config);
> +	}
>  }
>  
>  static void
> @@ -11224,8 +11335,6 @@ void intel_modeset_gem_init(struct drm_device *dev)
>  	intel_modeset_init_hw(dev);
>  
>  	intel_setup_overlay(dev);
> -
> -	intel_modeset_setup_hw_state(dev, false);
>  }
>  
>  void intel_modeset_cleanup(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index b2d2cc1..cb72304 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -198,6 +198,18 @@ typedef struct dpll {
>  	int	p;
>  } intel_clock_t;
>  
> +struct intel_plane_config {
> +	int pixel_format; /* DRM fourcc code */

The comment doesn't match how you do things in the code.

> +	int bpp;
> +	bool tiled;
> +	int base, offset;
> +	int fb_width, fb_height;
> +	int pipe_width, pipe_height;
> +	int pitch;
> +	int size;
> +	struct drm_i915_gem_object *obj;
> +};
> +
>  struct intel_crtc_config {
>  	/**
>  	 * quirks - bitfield with hw state readout quirks
> @@ -347,6 +359,7 @@ struct intel_crtc {
>  	bool cursor_visible;
>  
>  	struct intel_crtc_config config;
> +	struct intel_plane_config plane_config;
>  
>  	uint32_t ddi_pll_sel;
>  
> @@ -696,6 +709,7 @@ void hsw_enable_ips(struct intel_crtc *crtc);
>  void hsw_disable_ips(struct intel_crtc *crtc);
>  void intel_display_set_init_power(struct drm_device *dev, bool enable);
>  int valleyview_get_vco(struct drm_i915_private *dev_priv);
> +int intel_format_to_fourcc(int format);
>  
>  /* intel_dp.c */
>  void intel_dp_init(struct drm_device *dev, int output_reg, enum port port);
> -- 
> 1.8.4.2
> 
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-- 
Ville Syrjälä
Intel OTC