Re: [Intel-gfx] [PATCH v5 10/11] drm/i915: Add 180 degree primary plane rotation support

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

On Mon, Feb 10, 2014 at 01:01:17PM +0530, sagar.a.kamble@intel.com wrote:
> From: Sagar Kamble <sagar.a.kamble@intel.com>
> 
> Primary planes support 180 degree rotation. Expose the feature
> through rotation drm property.
> 
> v2: Calculating linear/tiled offsets based on pipe source width and
> height. Added 180 degree rotation support in ironlake_update_plane.
> 
> v3: Checking if CRTC is active before issueing update_plane. Added
> wait for vblank to make sure we dont overtake page flips. Disabling
> FBC since it does not work with rotated planes.
> 
> v4: Updated rotation checks for pending flips, fbc disable. Creating
> rotation property only for Gen4 onwards. Property resetting as part
> of lastclose.
> 
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-kernel@vger.kernel.org
> Cc: vijay.a.purushothaman@intel.com
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> Signed-off-by: Sagar Kamble <sagar.a.kamble@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_dma.c      | 12 +++++
>  drivers/gpu/drm/i915/i915_reg.h      |  1 +
>  drivers/gpu/drm/i915/intel_display.c | 86 ++++++++++++++++++++++++++++++++++--
>  drivers/gpu/drm/i915/intel_drv.h     |  2 +
>  drivers/gpu/drm/i915/intel_pm.c      |  9 ++++
>  5 files changed, 106 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 258b1be..fcd9e34 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1836,6 +1836,8 @@ int i915_driver_open(struct drm_device *dev, struct drm_file *file)
>  void i915_driver_lastclose(struct drm_device * dev)
>  {
>  	drm_i915_private_t *dev_priv = dev->dev_private;
> +	struct drm_crtc *crtc;
> +	struct drm_plane *plane;
>  
>  	/* On gen6+ we refuse to init without kms enabled, but then the drm core
>  	 * goes right around and calls lastclose. Check for this and don't clean
> @@ -1843,6 +1845,16 @@ void i915_driver_lastclose(struct drm_device * dev)
>  	if (!dev_priv)
>  		return;
>  
> +	if (dev_priv->rotation_property) {
> +		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
> +			drm_object_property_set_value(&crtc->base,
> +					dev_priv->rotation_property, 0);
> +
> +		list_for_each_entry(plane, &dev->mode_config.plane_list, head)
> +			drm_object_property_set_value(&plane->base,
> +					dev_priv->rotation_property, 0);
> +	}

That would need to be something like:

	struct intel_crtc *crtc
	list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
		crtc->rotation = BIT(DRM_ROTATE_0);
		drm_object_property_set_value(&crtc->base.base,
					      dev_priv->rotation_property,
					      crtc->rotation);
	}

and similarly for planes.

> +
>  	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
>  		intel_fbdev_restore_mode(dev);
>  		vga_switcheroo_process_delayed_switch();
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 57906c5..d3000c4 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3553,6 +3553,7 @@
>  #define   DISPPLANE_NO_LINE_DOUBLE		0
>  #define   DISPPLANE_STEREO_POLARITY_FIRST	0
>  #define   DISPPLANE_STEREO_POLARITY_SECOND	(1<<18)
> +#define   DISPPLANE_ROTATE_180			(1<<15)
>  #define   DISPPLANE_TRICKLE_FEED_DISABLE	(1<<14) /* Ironlake */
>  #define   DISPPLANE_TILED			(1<<10)
>  #define _DSPAADDR		(dev_priv->info->display_mmio_offset + 0x70184)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 4d4a0d9..4a4f650 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2037,6 +2037,7 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  	unsigned long linear_offset;
>  	u32 dspcntr;
>  	u32 reg;
> +	int pixel_size;
>  
>  	switch (plane) {
>  	case 0:
> @@ -2047,6 +2048,7 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  		return -EINVAL;
>  	}
>  
> +	pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
>  	intel_fb = to_intel_framebuffer(fb);
>  	obj = intel_fb->obj;
>  
> @@ -2054,6 +2056,8 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  	dspcntr = I915_READ(reg);
>  	/* Mask out pixel format bits in case we change it */
>  	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
> +	dspcntr &= ~DISPPLANE_ROTATE_180;
> +
>  	switch (fb->pixel_format) {
>  	case DRM_FORMAT_C8:
>  		dspcntr |= DISPPLANE_8BPP;
> @@ -2095,8 +2099,6 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  	if (IS_G4X(dev))
>  		dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;
>  
> -	I915_WRITE(reg, dspcntr);
> -
>  	linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
>  
>  	if (INTEL_INFO(dev)->gen >= 4) {
> @@ -2109,6 +2111,17 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  		intel_crtc->dspaddr_offset = linear_offset;
>  	}
>  
> +	if (intel_crtc->rotation == BIT(DRM_ROTATE_180)) {
> +		dspcntr |= DISPPLANE_ROTATE_180;
> +
> +		x += (intel_crtc->config.pipe_src_w - 1);
> +		y += (intel_crtc->config.pipe_src_h - 1);
> +		linear_offset += (intel_crtc->config.pipe_src_h - 1) * fb->pitches[0] +
> +                                   intel_crtc->config.pipe_src_w * pixel_size;

Off by one:
(pipe_src_w - 1) * pixel_size

> +	}
> +
> +	I915_WRITE(reg, dspcntr);
> +
>  	DRM_DEBUG_KMS("Writing base %08lX %08lX %d %d %d\n",
>  		      i915_gem_obj_ggtt_offset(obj), linear_offset, x, y,
>  		      fb->pitches[0]);
> @@ -2137,6 +2150,7 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
>  	unsigned long linear_offset;
>  	u32 dspcntr;
>  	u32 reg;
> +	int pixel_size;
>  
>  	switch (plane) {
>  	case 0:
> @@ -2148,6 +2162,7 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
>  		return -EINVAL;
>  	}
>  
> +	pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
>  	intel_fb = to_intel_framebuffer(fb);
>  	obj = intel_fb->obj;
>  
> @@ -2155,6 +2170,8 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
>  	dspcntr = I915_READ(reg);
>  	/* Mask out pixel format bits in case we change it */
>  	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
> +	dspcntr &= ~DISPPLANE_ROTATE_180;
> +
>  	switch (fb->pixel_format) {
>  	case DRM_FORMAT_C8:
>  		dspcntr |= DISPPLANE_8BPP;
> @@ -2192,8 +2209,6 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
>  	else
>  		dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;
>  
> -	I915_WRITE(reg, dspcntr);
> -
>  	linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
>  	intel_crtc->dspaddr_offset =
>  		intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
> @@ -2201,6 +2216,19 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
>  					       fb->pitches[0]);
>  	linear_offset -= intel_crtc->dspaddr_offset;
>  
> +	if (intel_crtc->rotation == BIT(DRM_ROTATE_180)) {
> +		dspcntr |= DISPPLANE_ROTATE_180;
> +
> +		if (!IS_HASWELL(dev) && !IS_BROADWELL(dev)) {
> +			x += (intel_crtc->config.pipe_src_w - 1);
> +			y += (intel_crtc->config.pipe_src_h - 1);
> +			linear_offset += (intel_crtc->config.pipe_src_h - 1) * fb->pitches[0] +
> +					intel_crtc->config.pipe_src_w * pixel_size;

Again:
(pipe_src_w - 1) * pixel_size

> +		}
> +	}
> +
> +	I915_WRITE(reg, dspcntr);
> +
>  	DRM_DEBUG_KMS("Writing base %08lX %08lX %d %d %d\n",
>  		      i915_gem_obj_ggtt_offset(obj), linear_offset, x, y,
>  		      fb->pitches[0]);
> @@ -8748,6 +8776,42 @@ free_work:
>  	return ret;
>  }
>  
> +static int intel_crtc_set_property(struct drm_crtc *crtc,
> +				    struct drm_property *prop,
> +				    uint64_t val)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	uint64_t old_val;
> +	int ret = -ENOENT;
> +
> +	if (prop == dev_priv->rotation_property) {
> +		/* exactly one rotation angle please */
> +		if (hweight32(val & 0xf) != 1)
> +			return -EINVAL;
> +
> +		old_val = intel_crtc->rotation;
> +		intel_crtc->rotation = val;
> +
> +		/* Updating rotation on plane should be done after pending flips.
> +		FBC does not work on some platforms for rotated planes */
> +		intel_crtc_wait_for_pending_flips(crtc);
> +		if (dev_priv->fbc.plane == intel_crtc->plane &&
> +			INTEL_INFO(dev)->gen <= 4 && !IS_G4X(dev) &&
> +			(intel_crtc->rotation != BIT(DRM_ROTATE_0)))

There's some weird indentation in the if-statement. When splitting such
things over multiple lines, the following lines should normally line up
after the opening parenthesis. Decent editors will do this for you
automagically.

Also the extra parens around the
'intel_crtc->rotation != BIT(DRM_ROTATE_0)' comparison aren't needed.

> +			intel_disable_fbc(dev);

Inactive crtc can't have any pending flips, nor can FBC be enabled in
that case. So all of this can be moved into the 'if (intel_crtc->active)'
block.

> +
> +		if (intel_crtc->active) {
> +			ret = dev_priv->display.update_plane(crtc, crtc->fb, 0, 0);
> +			if (ret)
> +				intel_crtc->rotation = old_val;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
>  static struct drm_crtc_helper_funcs intel_helper_funcs = {
>  	.mode_set_base_atomic = intel_pipe_set_base_atomic,
>  	.load_lut = intel_crtc_load_lut,
> @@ -10160,6 +10224,7 @@ static const struct drm_crtc_funcs intel_crtc_funcs = {
>  	.set_config = intel_crtc_set_config,
>  	.destroy = intel_crtc_destroy,
>  	.page_flip = intel_crtc_page_flip,
> +	.set_property = intel_crtc_set_property
>  };
>  
>  static void intel_cpu_pll_init(struct drm_device *dev)
> @@ -10288,6 +10353,7 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
>  	 */
>  	intel_crtc->pipe = pipe;
>  	intel_crtc->plane = pipe;
> +	intel_crtc->rotation = BIT(DRM_ROTATE_0);
>  	if (HAS_FBC(dev) && INTEL_INFO(dev)->gen < 4) {
>  		DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
>  		intel_crtc->plane = !pipe;
> @@ -10298,6 +10364,18 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
>  	dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base;
>  	dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = &intel_crtc->base;
>  
> +	if (INTEL_INFO(dev)->gen >= 4) {
> +		if (!dev_priv->rotation_property)
> +			dev_priv->rotation_property =
> +				drm_mode_create_rotation_property(dev,
> +								BIT(DRM_ROTATE_0) |
> +								BIT(DRM_ROTATE_180));
> +		if (dev_priv->rotation_property)
> +			drm_object_attach_property(&intel_crtc->base.base,
> +						dev_priv->rotation_property,
> +						intel_crtc->rotation);
> +	}
> +
>  	drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 7a79b8e..02dfdb6 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -331,6 +331,8 @@ struct intel_crtc {
>  	struct drm_crtc base;
>  	enum pipe pipe;
>  	enum plane plane;
> +	unsigned int rotation;
> +
>  	u8 lut_r[256], lut_g[256], lut_b[256];
>  	/*
>  	 * Whether the crtc and the connected output pipeline is active. Implies
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 3c79b63..d5b87c8 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -508,6 +508,15 @@ void intel_update_fbc(struct drm_device *dev)
>  	obj = intel_fb->obj;
>  	adjusted_mode = &intel_crtc->config.adjusted_mode;
>  
> +	if (dev_priv->fbc.plane == intel_crtc->plane &&
> +		INTEL_INFO(dev)->gen <= 4 && !IS_G4X(dev) &&
> +		(intel_crtc->rotation != BIT(DRM_ROTATE_0))) {

More weird indentation and needless parens.

> +		if (set_no_fbc_reason(dev_priv, FBC_UNSUPPORTED_MODE))
> +			DRM_DEBUG_KMS("mode incompatible with compression, "
> +				      "disabling\n");
> +		goto out_disable;
> +	}
> +
>  	if (i915.enable_fbc < 0 &&
>  	    INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev)) {
>  		if (set_no_fbc_reason(dev_priv, FBC_CHIP_DEFAULT))
> -- 
> 1.8.5
> 
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-- 
Ville Syrjälä
Intel OTC