Re: [PATCH 13/14] drm/i915: skylake primary plane scaling using shared scalers

Daniel Vetter
2015-04-16T07:34:21Z

On Wed, Apr 15, 2015 at 03:14:38PM -0700, Chandra Konduru wrote:
> This patch enables skylake primary plane scaling using shared
> scalers atomic desgin.
>
> v2:
> -use single copy of scaler limits (Matt)
>
> v3:
> -move detach_scalers to crtc commit path (Matt)
> -use values in plane_state->src as regular integers (me)
>
> v4:
> -changes to align with updated scaler structures (Matt, me)
> -keep plane src rect in 16.16 format (Matt, Daniel)
>
> v5:
> -Rebased on top of 90/270 rotation changes (me)
> -Fixed an issue introduced by 90/270 changes where plane programming
> is using drm_plane->state rect instead of intel_plane->state rect.
> This change also required for scaling to work properly. (me)
> -With 90/270, updated limits to cover both portrait and landscape usages (me)
> -Refactored skylake_update_primary_plane to reduce its size (Daniel)
> Added helper functions for refactoring are comprehended enough to be
> used for skylake_update_plane (for sprite) too. One stop towards
> having single function for all planes.

Please split out the refactoring into a prep patch since it's really hard
to review for functional changes when the code moves around. But when
that's split into a pure code-motion patch (which shouldn't have any
functional changes) and a subsequent patch to actually change the logic
then everything's a lot clearer. My BKM for splitting out prep patches is:

1. Create a new branch based on drm-intel-nightly.
2. Extract the first refactor step: You can either cherry-pick parts of
the patch or create it anew. Don't bother thinking about conflicts. Test
this patch to make sure you don't introduce a bisect issue.
3. Commit a revert of your refactor patch.
4. Cherry-pick the original patch, it should apply cleanly because the
baseline is unchanged due to the revert.
5. You now have 3 patches in your branch
- refactor patch
- Revert "refactor patch"
- real patch you want to split up
Now do a rebase and squash together the Revert and the real patch.
-> First step is cleanly split out without ever having to deal with
conflicts or risking bisectability issues. Your branch has now 2 patches:
- refactor patch
- real patch with refactor parts taken out

Repeat until you've split up the patch into all the different parts.

Cheers, Daniel
>
> Signed-off-by: Chandra Konduru <chandra.konduru@intel.com>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> Testcase: kms_plane_scaling
> ---
> drivers/gpu/drm/i915/intel_atomic.c | 5 +-
> drivers/gpu/drm/i915/intel_display.c | 261 +++++++++++++++++++++++++---------
> drivers/gpu/drm/i915/intel_drv.h | 8 +-
> drivers/gpu/drm/i915/intel_sprite.c | 9 ++
> 4 files changed, 213 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> index 3c4b7cd..cb6d5f2 100644
> --- a/drivers/gpu/drm/i915/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> @@ -169,7 +169,7 @@ int intel_atomic_commit(struct drm_device *dev,
> plane->state->state = NULL;
> }
>
> - /* swap crtc_state */
> + /* swap crtc_scaler_state */
> for (i = 0; i < dev->mode_config.num_crtc; i++) {
> struct drm_crtc *crtc = state->crtcs[i];
> if (!crtc) {
> @@ -178,6 +178,9 @@ int intel_atomic_commit(struct drm_device *dev,
>
> to_intel_crtc(crtc)->config->scaler_state =
> to_intel_crtc_state(state->crtc_states[i])->scaler_state;
> +
> + if (INTEL_INFO(dev)->gen >= 9)
> + skl_detach_scalers(to_intel_crtc(crtc));
> }
>
> drm_atomic_helper_commit_planes(dev, state);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5f7a40f..7f3ae8e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2960,126 +2960,199 @@ void skl_detach_scalers(struct intel_crtc *intel_crtc)
> }
> }
>
> -static void skylake_update_primary_plane(struct drm_crtc *crtc,
> - struct drm_framebuffer *fb,
> - int x, int y)
> +u32 skl_plane_ctl_format(uint32_t pixel_format)
> {
> - struct drm_device *dev = crtc->dev;
> - struct drm_i915_private *dev_priv = dev->dev_private;
> - struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct drm_i915_gem_object *obj;
> - int pipe = intel_crtc->pipe;
> - u32 plane_ctl, stride_div, stride;
> - u32 tile_height, plane_offset, plane_size;
> - unsigned int rotation;
> - int x_offset, y_offset;
> - unsigned long surf_addr;
> - struct drm_plane *plane;
> -
> - if (!intel_crtc->primary_enabled) {
> - I915_WRITE(PLANE_CTL(pipe, 0), 0);
> - I915_WRITE(PLANE_SURF(pipe, 0), 0);
> - POSTING_READ(PLANE_CTL(pipe, 0));
> - return;
> - }
> -
> - plane_ctl = PLANE_CTL_ENABLE |
> - PLANE_CTL_PIPE_GAMMA_ENABLE |
> - PLANE_CTL_PIPE_CSC_ENABLE;
> -
> - switch (fb->pixel_format) {
> + u32 plane_ctl_format = 0;
> + switch (pixel_format) {
> case DRM_FORMAT_RGB565:
> - plane_ctl |= PLANE_CTL_FORMAT_RGB_565;
> - break;
> - case DRM_FORMAT_XRGB8888:
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> - break;
> - case DRM_FORMAT_ARGB8888:
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> - plane_ctl |= PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> + plane_ctl_format = PLANE_CTL_FORMAT_RGB_565;
> break;
> case DRM_FORMAT_XBGR8888:
> - plane_ctl |= PLANE_CTL_ORDER_RGBX;
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> + plane_ctl_format = PLANE_CTL_FORMAT_XRGB_8888 | PLANE_CTL_ORDER_RGBX;
> break;
> + case DRM_FORMAT_XRGB8888:
> + plane_ctl_format = PLANE_CTL_FORMAT_XRGB_8888;
> + break;
> + /*
> + * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
> + * to be already pre-multiplied. We need to add a knob (or a different
> + * DRM_FORMAT) for user-space to configure that.
> + */
> case DRM_FORMAT_ABGR8888:
> - plane_ctl |= PLANE_CTL_ORDER_RGBX;
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> - plane_ctl |= PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> + plane_ctl_format = PLANE_CTL_FORMAT_XRGB_8888 | PLANE_CTL_ORDER_RGBX |
> + PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> + break;
> + case DRM_FORMAT_ARGB8888:
> + plane_ctl_format = PLANE_CTL_FORMAT_XRGB_8888 |
> + PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> break;
> case DRM_FORMAT_XRGB2101010:
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_2101010;
> + plane_ctl_format = PLANE_CTL_FORMAT_XRGB_2101010;
> break;
> case DRM_FORMAT_XBGR2101010:
> - plane_ctl |= PLANE_CTL_ORDER_RGBX;
> - plane_ctl |= PLANE_CTL_FORMAT_XRGB_2101010;
> + plane_ctl_format = PLANE_CTL_ORDER_RGBX | PLANE_CTL_FORMAT_XRGB_2101010;
> + break;
> + case DRM_FORMAT_YUYV:
> + plane_ctl_format = PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YUYV;
> + break;
> + case DRM_FORMAT_YVYU:
> + plane_ctl_format = PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_YVYU;
> + break;
> + case DRM_FORMAT_UYVY:
> + plane_ctl_format = PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_UYVY;
> + break;
> + case DRM_FORMAT_VYUY:
> + plane_ctl_format = PLANE_CTL_FORMAT_YUV422 | PLANE_CTL_YUV422_VYUY;
> break;
> default:
> BUG();
> }
> + return plane_ctl_format;
> +}
>
> - switch (fb->modifier[0]) {
> +u32 skl_plane_ctl_tiling(uint64_t fb_modifier)
> +{
> + u32 plane_ctl_tiling = 0;
> + switch (fb_modifier) {
> case DRM_FORMAT_MOD_NONE:
> break;
> case I915_FORMAT_MOD_X_TILED:
> - plane_ctl |= PLANE_CTL_TILED_X;
> + plane_ctl_tiling = PLANE_CTL_TILED_X;
> break;
> case I915_FORMAT_MOD_Y_TILED:
> - plane_ctl |= PLANE_CTL_TILED_Y;
> + plane_ctl_tiling = PLANE_CTL_TILED_Y;
> break;
> case I915_FORMAT_MOD_Yf_TILED:
> - plane_ctl |= PLANE_CTL_TILED_YF;
> + plane_ctl_tiling = PLANE_CTL_TILED_YF;
> break;
> default:
> - MISSING_CASE(fb->modifier[0]);
> + MISSING_CASE(fb_modifier);
> }
> + return plane_ctl_tiling;
> +}
>
> - plane_ctl |= PLANE_CTL_PLANE_GAMMA_DISABLE;
> -
> - plane = crtc->primary;
> - rotation = plane->state->rotation;
> +u32 skl_plane_ctl_rotation(unsigned int rotation)
> +{
> + u32 plane_ctl_rotation = 0;
> switch (rotation) {
> + case BIT(DRM_ROTATE_0):
> + break;
> case BIT(DRM_ROTATE_90):
> - plane_ctl |= PLANE_CTL_ROTATE_90;
> + plane_ctl_rotation = PLANE_CTL_ROTATE_90;
> break;
> -
> case BIT(DRM_ROTATE_180):
> - plane_ctl |= PLANE_CTL_ROTATE_180;
> + plane_ctl_rotation = PLANE_CTL_ROTATE_180;
> break;
> -
> case BIT(DRM_ROTATE_270):
> - plane_ctl |= PLANE_CTL_ROTATE_270;
> + plane_ctl_rotation = PLANE_CTL_ROTATE_270;
> break;
> + default:
> + MISSING_CASE(rotation);
> }
>
> + return plane_ctl_rotation;
> +}
> +
> +static void skylake_update_primary_plane(struct drm_crtc *crtc,
> + struct drm_framebuffer *fb,
> + int x, int y)
> +{
> + struct drm_device *dev = crtc->dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + struct drm_i915_gem_object *obj;
> + int pipe = intel_crtc->pipe;
> + u32 plane_ctl, stride_div, stride;
> + u32 tile_height, plane_offset, plane_size;
> + unsigned int rotation;
> + int x_offset, y_offset;
> + unsigned long surf_addr;
> + struct drm_plane *plane;
> + struct intel_crtc_state *crtc_state = intel_crtc->config;
> + struct intel_plane_state *plane_state;
> + int src_x = 0, src_y = 0, src_w = 0, src_h = 0;
> + int dst_x = 0, dst_y = 0, dst_w = 0, dst_h = 0;
> + int scaler_id = -1;
> +
> + plane = crtc->primary;
> + plane_state = plane ? to_intel_plane_state(crtc->primary->state) : NULL;
> +
> + if (!intel_crtc->primary_enabled) {
> + I915_WRITE(PLANE_CTL(pipe, 0), 0);
> + I915_WRITE(PLANE_SURF(pipe, 0), 0);
> + POSTING_READ(PLANE_CTL(pipe, 0));
> + return;
> + }
> +
> + plane_ctl = PLANE_CTL_ENABLE |
> + PLANE_CTL_PIPE_GAMMA_ENABLE |
> + PLANE_CTL_PIPE_CSC_ENABLE;
> +
> + plane_ctl |= skl_plane_ctl_format(fb->pixel_format);
> + plane_ctl |= skl_plane_ctl_tiling(fb->modifier[0]);
> + plane_ctl |= PLANE_CTL_PLANE_GAMMA_DISABLE;
> +
> + rotation = plane->state->rotation;
> + plane_ctl |= skl_plane_ctl_rotation(rotation);
> +
> obj = intel_fb_obj(fb);
> stride_div = intel_fb_stride_alignment(dev, fb->modifier[0],
> fb->pixel_format);
> surf_addr = intel_plane_obj_offset(to_intel_plane(plane), obj);
>
> + if (plane_state && drm_rect_width(&plane_state->src)) {
> + scaler_id = plane_state->scaler_id;
> + src_x = plane_state->src.x1 >> 16;
> + src_y = plane_state->src.y1 >> 16;
> + src_w = drm_rect_width(&plane_state->src) >> 16;
> + src_h = drm_rect_height(&plane_state->src) >> 16;
> + dst_x = plane_state->dst.x1;
> + dst_y = plane_state->dst.y1;
> + dst_w = drm_rect_width(&plane_state->dst);
> + dst_h = drm_rect_height(&plane_state->dst);
> +
> + WARN_ON(x != src_x || y != src_y);
> + } else {
> + src_w = intel_crtc->config->pipe_src_w;
> + src_h = intel_crtc->config->pipe_src_h;
> + }
> +
> if (intel_rotation_90_or_270(rotation)) {
> /* stride = Surface height in tiles */
> tile_height = intel_tile_height(dev, fb->bits_per_pixel,
> fb->modifier[0]);
> stride = DIV_ROUND_UP(fb->height, tile_height);
> - x_offset = stride * tile_height - y - (plane->state->src_h >> 16);
> + x_offset = stride * tile_height - y - src_h;
> y_offset = x;
> - plane_size = ((plane->state->src_w >> 16) - 1) << 16 |
> - ((plane->state->src_h >> 16) - 1);
> + plane_size = (src_w - 1) << 16 | (src_h - 1);
> } else {
> stride = fb->pitches[0] / stride_div;
> x_offset = x;
> y_offset = y;
> - plane_size = ((plane->state->src_h >> 16) - 1) << 16 |
> - ((plane->state->src_w >> 16) - 1);
> + plane_size = (src_h - 1) << 16 | (src_w - 1);
> }
> plane_offset = y_offset << 16 | x_offset;
>
> I915_WRITE(PLANE_CTL(pipe, 0), plane_ctl);
> - I915_WRITE(PLANE_POS(pipe, 0), 0);
> I915_WRITE(PLANE_OFFSET(pipe, 0), plane_offset);
> I915_WRITE(PLANE_SIZE(pipe, 0), plane_size);
> I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
> +
> + if (scaler_id >= 0) {
> + uint32_t ps_ctrl = 0;
> +
> + WARN_ON(!dst_w || !dst_h);
> + ps_ctrl = PS_SCALER_EN | PS_PLANE_SEL(0) |
> + crtc_state->scaler_state.scalers[scaler_id].mode;
> + I915_WRITE(SKL_PS_CTRL(pipe, scaler_id), ps_ctrl);
> + I915_WRITE(SKL_PS_PWR_GATE(pipe, scaler_id), 0);
> + I915_WRITE(SKL_PS_WIN_POS(pipe, scaler_id), (dst_x << 16) | dst_y);
> + I915_WRITE(SKL_PS_WIN_SZ(pipe, scaler_id), (dst_w << 16) | dst_h);
> + I915_WRITE(PLANE_POS(pipe, 0), 0);
> + } else {
> + I915_WRITE(PLANE_POS(pipe, 0), (dst_y << 16) | dst_x);
> + }
> +
> I915_WRITE(PLANE_SURF(pipe, 0), surf_addr);
>
> POSTING_READ(PLANE_SURF(pipe, 0));
> @@ -4338,6 +4411,7 @@ skl_update_scaler_users(
> int *scaler_id;
> struct drm_framebuffer *fb;
> struct intel_crtc_scaler_state *scaler_state;
> + unsigned int rotation;
>
> if (!intel_crtc || !crtc_state)
> return 0;
> @@ -4353,6 +4427,7 @@ skl_update_scaler_users(
> dst_w = drm_rect_width(&plane_state->dst);
> dst_h = drm_rect_height(&plane_state->dst);
> scaler_id = &plane_state->scaler_id;
> + rotation = plane_state->base.rotation;
> } else {
> struct drm_display_mode *adjusted_mode =
> &crtc_state->base.adjusted_mode;
> @@ -4361,8 +4436,12 @@ skl_update_scaler_users(
> dst_w = adjusted_mode->hdisplay;
> dst_h = adjusted_mode->vdisplay;
> scaler_id = &scaler_state->scaler_id;
> + rotation = DRM_ROTATE_0;
> }
> - need_scaling = (src_w != dst_w || src_h != dst_h);
> +
> + need_scaling = intel_rotation_90_or_270(rotation) ?
> + (src_h != dst_w || src_w != dst_h):
> + (src_w != dst_w || src_h != dst_h);
>
> /*
> * if plane is being disabled or scaler is no more required or force detach
> @@ -12805,6 +12884,36 @@ intel_cleanup_plane_fb(struct drm_plane *plane,
> }
> }
>
> +int
> +skl_max_scale(struct intel_crtc *intel_crtc, struct intel_crtc_state *crtc_state)
> +{
> + int max_scale;
> + struct drm_device *dev;
> + struct drm_i915_private *dev_priv;
> + int crtc_clock, cdclk;
> +
> + if (!intel_crtc || !crtc_state)
> + return DRM_PLANE_HELPER_NO_SCALING;
> +
> + dev = intel_crtc->base.dev;
> + dev_priv = dev->dev_private;
> + crtc_clock = crtc_state->base.adjusted_mode.crtc_clock;
> + cdclk = dev_priv->display.get_display_clock_speed(dev);
> +
> + if (!crtc_clock || !cdclk)
> + return DRM_PLANE_HELPER_NO_SCALING;
> +
> + /*
> + * skl max scale is lower of:
> + * close to 3 but not 3, -1 is for that purpose
> + * or
> + * cdclk/crtc_clock
> + */
> + max_scale = min((1 << 16) * 3 - 1, (1 << 8) * ((cdclk << 8) / crtc_clock));
> +
> + return max_scale;
> +}
> +
> static int
> intel_check_primary_plane(struct drm_plane *plane,
> struct intel_plane_state *state)
> @@ -12813,23 +12922,31 @@ intel_check_primary_plane(struct drm_plane *plane,
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct drm_crtc *crtc = state->base.crtc;
> struct intel_crtc *intel_crtc;
> + struct intel_crtc_state *crtc_state;
> struct drm_framebuffer *fb = state->base.fb;
> struct drm_rect *dest = &state->dst;
> struct drm_rect *src = &state->src;
> const struct drm_rect *clip = &state->clip;
> bool can_position = false;
> + int max_scale = DRM_PLANE_HELPER_NO_SCALING;
> + int min_scale = DRM_PLANE_HELPER_NO_SCALING;
> int ret;
>
> crtc = crtc ? crtc : plane->crtc;
> intel_crtc = to_intel_crtc(crtc);
> + crtc_state = state->base.state ?
> + intel_atomic_get_crtc_state(state->base.state, intel_crtc) : NULL;
>
> - if (INTEL_INFO(dev)->gen >= 9)
> + if (INTEL_INFO(dev)->gen >= 9) {
> + min_scale = 1;
> + max_scale = skl_max_scale(intel_crtc, crtc_state);
> can_position = true;
> + }
>
> ret = drm_plane_helper_check_update(plane, crtc, fb,
> src, dest, clip,
> - DRM_PLANE_HELPER_NO_SCALING,
> - DRM_PLANE_HELPER_NO_SCALING,
> + min_scale,
> + max_scale,
> can_position, true,
> &state->visible);
> if (ret)
> @@ -12874,6 +12991,13 @@ intel_check_primary_plane(struct drm_plane *plane,
> intel_crtc->atomic.update_wm = true;
> }
>
> + if (INTEL_INFO(dev)->gen >= 9) {
> + ret = skl_update_scaler_users(intel_crtc, crtc_state,
> + to_intel_plane(plane), state, 0);
> + if (ret)
> + return ret;
> + }
> +
> return 0;
> }
>
> @@ -13053,6 +13177,9 @@ static struct drm_plane *intel_primary_plane_create(struct drm_device *dev,
>
> primary->can_scale = false;
> primary->max_downscale = 1;
> + if (INTEL_INFO(dev)->gen >= 9) {
> + primary->can_scale = true;
> + }
> state->scaler_id = -1;
> primary->pipe = pipe;
> primary->plane = pipe;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 275a4ef..c9bc975 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -288,11 +288,11 @@ struct intel_initial_plane_config {
> #define SKL_MIN_SRC_W 8
> #define SKL_MAX_SRC_W 4096
> #define SKL_MIN_SRC_H 8
> -#define SKL_MAX_SRC_H 2304
> +#define SKL_MAX_SRC_H 4096
> #define SKL_MIN_DST_W 8
> #define SKL_MAX_DST_W 4096
> #define SKL_MIN_DST_H 8
> -#define SKL_MAX_DST_H 2304
> +#define SKL_MAX_DST_H 4096
>
> struct intel_scaler {
> int id;
> @@ -1131,9 +1131,13 @@ void skl_detach_scalers(struct intel_crtc *intel_crtc);
> int skl_update_scaler_users(struct intel_crtc *intel_crtc,
> struct intel_crtc_state *crtc_state, struct intel_plane *intel_plane,
> struct intel_plane_state *plane_state, int force_detach);
> +int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);
>
> unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,
> struct drm_i915_gem_object *obj);
> +u32 skl_plane_ctl_format(uint32_t pixel_format);
> +u32 skl_plane_ctl_tiling(uint64_t fb_modifier);
> +u32 skl_plane_ctl_rotation(unsigned int rotation);
>
> /* intel_dp.c */
> void intel_dp_init(struct drm_device *dev, int output_reg, enum port port);
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index 0cb3767..2f42777 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -1150,6 +1150,15 @@ int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
> }
>
> intel_plane = to_intel_plane(plane);
> +
> + if (INTEL_INFO(dev)->gen >= 9) {
> + /* plane scaling and colorkey are mutually exclusive */
> + if (to_intel_plane_state(plane->state)->scaler_id >= 0) {
> + DRM_ERROR("colorkey not allowed with scaler\n");
> + return -EINVAL;
> + }
> + }
> +
> intel_plane->ckey = *set;
>
> /*
> --
> 1.7.9.5
>
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
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--
Daniel Vetter
Software Engineer, Intel Corporation