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

Ville Syrjälä
2014-01-31T20:58:14Z

On Sat, Feb 01, 2014 at 12:40:46AM +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.
>
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> Signed-off-by: Sagar Kamble <sagar.a.kamble@intel.com>
> Tested-by: Sagar Kamble <sagar.a.kamble@intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> drivers/gpu/drm/i915/intel_display.c | 54 ++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> 3 files changed, 55 insertions(+), 2 deletions(-)
>
> 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..483de59 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 += (fb->width - 1);
> + y += (fb->height - 1);
> + linear_offset += (fb->height - 1) * fb->pitches[0] +
> + fb->width * pixel_size;
> + }

This isn't quite right. We need something like:
x += pipe_src_w - 1;
y += pipe_src_h - 1;

That suggests your tests don't check if panning works correctly when
rotated.

I was also going to say we need to do this before stashing the result
into intel_crtc->dspaddr_offset on gen2/3, but it actually looks like
rotation is a gen4+ feature, so this place looks OK for this code.

You've also forgotten to add the rotation bits to
ironlake_update_plane(). That one will need additional HSW/BDW checks
I think.

> +
> + 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 +8761,31 @@ 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;
> + 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 +10198,7 @@ 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 +10327,7 @@ 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 +10338,16 @@ 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 (!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);

As I mentioned it looks like rotation is only supported starting from
gen4. So we need to check for that here before we add the props.

> +
> 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
> --
> 1.8.5
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

--
Ville Syrjälä
Intel OTC