[Intel-gfx] [RFC 3/4] drm/i915/gen9: Expose top-most universal plane as cursor
Paulo Zanoni
paulo.r.zanoni at intel.com
Thu Oct 27 20:03:54 UTC 2016
Em Qua, 2016-10-26 às 15:51 -0700, Matt Roper escreveu:
> Gen9 has a traditional cursor plane that is mutually exclusive with
> the
> system's top-most "universal" plane; it seems likely that two planes
> are
> really a single shared hardware unit with two different register
> interfaces. Thus far i915 has exposed a cursor plane to userspace
> that's hooked up to the old-style cursor registers; we just pretended
> that the top-most universal plane didn't exist and reported one fewer
> "sprite/overlay" planes for each pipe than the platform technically
> has.
> Let's switch this around so that the cursor exposed to userspace is
> actually wired up to top-most universal plane registers. We'll
> continue
> to present the same cursor ABI to userspace that we always have, but
> internally we'll just be programming a different set of registers and
> doing so in a way that's more consistent with how all the other gen9
> planes work --- less cursor-specific special cases throughout the
> code.
>
> Aside from making the code a bit simpler (fewer cursor-specific
> special
> cases), this will also pave the way to eventually exposing the top-
> most
> plane in a more full-featured manner to userspace clients that don't
> need a traditional cursor and wish to opt into having access to an
> additional sprite/overlay-style plane instead.
>
> It's worth noting that a lot of the special-cased cursor-specific
> code
> was in the gen9 watermark programming. It's good to simplify that
> code,
> but we should keep an eye out for any unwanted side effects of this
> patch; since sprites/overlays tend to get used less than cursors,
> it's
> possible that this could help us uncover additional underruns that
> nobody had run across yet. Or it could have the opposite effect and
> eliminate some of the underruns that we haven't been able to get rid
> of
> yet.
>
> Cc: Bob Paauwe <bob.j.paauwe at intel.com>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Lyude Paul <lyude at redhat.com>
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 4 --
> drivers/gpu/drm/i915/i915_drv.h | 11 +++-
> drivers/gpu/drm/i915/intel_device_info.c | 38 +++++++++----
> drivers/gpu/drm/i915/intel_display.c | 97 ++++++++++++--------
> ------------
> drivers/gpu/drm/i915/intel_drv.h | 7 +++
> drivers/gpu/drm/i915/intel_pm.c | 85 ++++----------------
> --------
> drivers/gpu/drm/i915/intel_sprite.c | 6 +-
> 7 files changed, 93 insertions(+), 155 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 9f5a392..0bba472 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -3469,10 +3469,6 @@ static int i915_ddb_info(struct seq_file *m,
> void *unused)
> entry->start, entry->end,
> skl_ddb_entry_size(entry));
> }
> -
> - entry = &ddb->plane[pipe][PLANE_CURSOR];
> - seq_printf(m, " %-13s%8u%8u%8u\n", "Cursor", entry-
> >start,
> - entry->end, skl_ddb_entry_size(entry));
> }
>
> drm_modeset_unlock_all(dev);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index 4714051..83aaed2 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -178,7 +178,7 @@ enum plane {
> PLANE_A = 0,
> PLANE_B,
> PLANE_C,
> - PLANE_CURSOR,
> + PLANE_D,
> I915_MAX_PLANES,
> };
> #define plane_name(p) ((p) + 'A')
> @@ -316,9 +316,15 @@ struct i915_hotplug {
> for ((__p) = 0;
> \
> (__p) < INTEL_INFO(__dev_priv)->num_sprites[(__pipe)] +
> 1; \
> (__p)++)
> +
> +/*
> + * Only iterate over sprites exposed as sprites; omit sprites that
> + * are being repurposed to simulate a cursor.
> + */
> #define for_each_sprite(__dev_priv, __p, __s)
> \
> for ((__s) = 0;
> \
> - (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)];
> \
> + (__s) < INTEL_INFO(__dev_priv)->num_sprites[(__p)] -
> \
> + (INTEL_INFO(__dev_priv)->has_real_cursor ? 0 :
> 1); \
> (__s)++)
>
> #define for_each_port_masked(__port, __ports_mask) \
> @@ -687,6 +693,7 @@ struct intel_csr {
> func(has_psr); \
> func(has_rc6); \
> func(has_rc6p); \
> + func(has_real_cursor); \
> func(has_resource_streamer); \
> func(has_runtime_pm); \
> func(has_snoop); \
> diff --git a/drivers/gpu/drm/i915/intel_device_info.c
> b/drivers/gpu/drm/i915/intel_device_info.c
> index d6a8f11..a464e0e 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.c
> +++ b/drivers/gpu/drm/i915/intel_device_info.c
> @@ -271,23 +271,39 @@ void intel_device_info_runtime_init(struct
> drm_i915_private *dev_priv)
> enum pipe pipe;
>
> /*
> - * Skylake and Broxton currently don't expose the topmost
> plane as its
> - * use is exclusive with the legacy cursor and we only want
> to expose
> - * one of those, not both. Until we can safely expose the
> topmost plane
> - * as a DRM_PLANE_TYPE_CURSOR with all the features
> exposed/supported,
> - * we don't expose the topmost plane at all to prevent ABI
> breakage
> - * down the line.
> + * Gen9 platforms have a top-most universal (i.e., sprite)
> plane and a
> + * cursor plane that are mutually exclusive. If we use the
> cursor
> + * plane we permanently lose the ability to make use of the
> more
> + * full-featured universal plane. So instead let's use all
> of the
> + * universal planes, ignore the cursor plane, but hook the
> top-most
> + * universal plane up to the legacy cursor ioctl's and
> expose it to
> + * userspace as DRM_PLANE_TYPE_CURSOR. This won't result in
> any
> + * visible behavior change to userspace; we're just
> internally
> + * programming a different set of registers.
> + *
> + * For the purposes of device_info, we're only concerned
> with the
> + * number of universal planes we're programming, regardless
> of how they
> + * get mapped to userspace interfaces, so we'll report the
> true number of
> + * universal planes for gen9.
> */
> if (IS_BROXTON(dev_priv)) {
> - info->num_sprites[PIPE_A] = 2;
> - info->num_sprites[PIPE_B] = 2;
> - info->num_sprites[PIPE_C] = 1;
> - } else if (IS_VALLEYVIEW(dev_priv) ||
> IS_CHERRYVIEW(dev_priv))
> + info->has_real_cursor = 0;
> + info->num_sprites[PIPE_A] = 3;
> + info->num_sprites[PIPE_B] = 3;
> + info->num_sprites[PIPE_C] = 2;
> + } else if (IS_GEN9(dev_priv)) {
> + info->has_real_cursor = 0;
> for_each_pipe(dev_priv, pipe)
> info->num_sprites[pipe] = 2;
> - else
> + } else if (IS_VALLEYVIEW(dev_priv) ||
> IS_CHERRYVIEW(dev_priv)) {
> + info->has_real_cursor = 1;
> + for_each_pipe(dev_priv, pipe)
> + info->num_sprites[pipe] = 2;
> + } else {
> + info->has_real_cursor = 1;
> for_each_pipe(dev_priv, pipe)
> info->num_sprites[pipe] = 1;
> + }
>
> if (i915.disable_display) {
> DRM_INFO("Display disabled (module parameter)\n");
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index cb7dd11..9a8c2b1 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -1232,6 +1232,23 @@ void assert_panel_unlocked(struct
> drm_i915_private *dev_priv, enum pipe pipe)
> pipe_name(pipe));
> }
>
> +/*
> + * Cursor state for platforms that use a universal plane as a
> cursor.
> + * Primary is universal #0, others are universal #1-
> numsprites. Cursor
> + * will be the final universal plane for the pipe.
> + */
> +static bool
> +universal_cursor_state(struct drm_i915_private *dev_priv,
-ENOVERB
get_universal_cursor_state()?
> + enum pipe pipe)
> +{
> + unsigned int planenum = INTEL_INFO(dev_priv)-
> >num_sprites[pipe];
> + u32 val;
> +
> + val = I915_READ(PLANE_CTL(pipe, planenum));
> +
> + return val & PLANE_CTL_ENABLE;
> +}
> +
> static void assert_cursor(struct drm_i915_private *dev_priv,
> enum pipe pipe, bool state)
> {
> @@ -1239,6 +1256,8 @@ static void assert_cursor(struct
> drm_i915_private *dev_priv,
>
> if (IS_845G(dev_priv) || IS_I865G(dev_priv))
> cur_state = I915_READ(CURCNTR(PIPE_A)) &
> CURSOR_ENABLE;
> + else if (!INTEL_INFO(dev_priv)->has_real_cursor)
> + cur_state = universal_cursor_state(dev_priv, pipe);
> else
> cur_state = I915_READ(CURCNTR(pipe)) & CURSOR_MODE;
>
> @@ -10841,15 +10860,16 @@ static void i9xx_update_cursor(struct
> drm_crtc *crtc, u32 base,
> struct drm_device *dev = crtc->dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct intel_crtc_state *cstate = to_intel_crtc_state(crtc-
> >state);
> - const struct skl_wm_values *wm = &dev_priv->wm.skl_results;
> - const struct skl_plane_wm *p_wm =
> - &cstate->wm.skl.optimal.planes[PLANE_CURSOR];
> int pipe = intel_crtc->pipe;
> uint32_t cntl = 0;
>
> - if (INTEL_GEN(dev_priv) >= 9 && wm->dirty_pipes &
> drm_crtc_mask(crtc))
> - skl_write_cursor_wm(intel_crtc, p_wm, &wm->ddb);
> + /*
> + * Although gen9 has legacy cursor registers, their use is
> mutually
> + * exclusive with the top-most universal plane. We'll just
> use the
> + * universal plane to simulate the legacy cursor interface
> instead,
> + * which means we'll never enter here on gen9 platforms.
> + */
> + WARN_ON(IS_GEN9(dev_priv));
>
> if (plane_state && plane_state->base.visible) {
> cntl = MCURSOR_GAMMA_ENABLE;
> @@ -13528,56 +13548,6 @@ static void verify_wm_state(struct drm_crtc
> *crtc,
> hw_ddb_entry->start, hw_ddb_entry-
> >end);
> }
> }
> -
> - /*
> - * cursor
> - * If the cursor plane isn't active, we may not have updated
> it's ddb
> - * allocation. In that case since the ddb allocation will be
> updated
> - * once the plane becomes visible, we can skip this check
> - */
> - if (intel_crtc->cursor_addr) {
> - hw_plane_wm = &hw_wm.planes[PLANE_CURSOR];
> - sw_plane_wm = &sw_wm->planes[PLANE_CURSOR];
> -
> - /* Watermarks */
> - for (level = 0; level <= max_level; level++) {
> - if (skl_wm_level_equals(&hw_plane_wm-
> >wm[level],
> - &sw_plane_wm-
> >wm[level]))
> - continue;
> -
> - DRM_ERROR("mismatch in WM pipe %c cursor
> level %d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
> - pipe_name(pipe), level,
> - sw_plane_wm->wm[level].plane_en,
> - sw_plane_wm-
> >wm[level].plane_res_b,
> - sw_plane_wm-
> >wm[level].plane_res_l,
> - hw_plane_wm->wm[level].plane_en,
> - hw_plane_wm-
> >wm[level].plane_res_b,
> - hw_plane_wm-
> >wm[level].plane_res_l);
> - }
> -
> - if (!skl_wm_level_equals(&hw_plane_wm->trans_wm,
> - &sw_plane_wm->trans_wm)) {
> - DRM_ERROR("mismatch in trans WM pipe %c
> cursor (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
> - pipe_name(pipe),
> - sw_plane_wm->trans_wm.plane_en,
> - sw_plane_wm->trans_wm.plane_res_b,
> - sw_plane_wm->trans_wm.plane_res_l,
> - hw_plane_wm->trans_wm.plane_en,
> - hw_plane_wm->trans_wm.plane_res_b,
> - hw_plane_wm-
> >trans_wm.plane_res_l);
> - }
> -
> - /* DDB */
> - hw_ddb_entry = &hw_ddb.plane[pipe][PLANE_CURSOR];
> - sw_ddb_entry = &sw_ddb->plane[pipe][PLANE_CURSOR];
> -
> - if (!skl_ddb_entry_equal(hw_ddb_entry,
> sw_ddb_entry)) {
> - DRM_ERROR("mismatch in DDB state pipe %c
> cursor (expected (%u,%u), found (%u,%u))\n",
> - pipe_name(pipe),
> - sw_ddb_entry->start, sw_ddb_entry-
> >end,
> - hw_ddb_entry->start, hw_ddb_entry-
> >end);
> - }
> - }
> }
>
> static void
> @@ -15215,11 +15185,18 @@ static struct drm_plane
> *intel_cursor_plane_create(struct drm_device *dev,
> cursor->can_scale = false;
> cursor->max_downscale = 1;
> cursor->pipe = pipe;
> - cursor->plane = pipe;
> cursor->frontbuffer_bit = INTEL_FRONTBUFFER_CURSOR(pipe);
> - cursor->check_plane = intel_check_cursor_plane;
> - cursor->update_plane = intel_update_cursor_plane;
> - cursor->disable_plane = intel_disable_cursor_plane;
> + if (INTEL_INFO(dev)->has_real_cursor) {
> + cursor->plane = pipe; /* unused? */
> + cursor->check_plane = intel_check_cursor_plane;
> + cursor->update_plane = intel_update_cursor_plane;
> + cursor->disable_plane = intel_disable_cursor_plane;
> + } else {
> + cursor->plane = INTEL_INFO(dev)->num_sprites[pipe] -
> 1;
> + cursor->check_plane = intel_check_sprite_plane;
> + cursor->update_plane = skl_update_plane;
> + cursor->disable_plane = skl_disable_plane;
> + }
>
> ret = drm_universal_plane_init(dev, &cursor->base, 0,
> &intel_plane_funcs,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index c31fddd..50874e2 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1790,6 +1790,13 @@ int intel_sprite_set_colorkey(struct
> drm_device *dev, void *data,
> struct drm_file *file_priv);
> void intel_pipe_update_start(struct intel_crtc *crtc);
> void intel_pipe_update_end(struct intel_crtc *crtc, struct
> intel_flip_work *work);
> +int intel_check_sprite_plane(struct drm_plane *plane,
> + struct intel_crtc_state *crtc_state,
> + struct intel_plane_state *state);
> +void skl_update_plane(struct drm_plane *drm_plane,
> + const struct intel_crtc_state *crtc_state,
> + const struct intel_plane_state *plane_state);
> +void skl_disable_plane(struct drm_plane *dplane, struct drm_crtc
> *crtc);
>
> /* intel_tv.c */
> void intel_tv_init(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index 6f19e60..e75f6d8 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2863,9 +2863,7 @@ bool ilk_disable_lp_wm(struct drm_device *dev)
>
> /*
> * Return the index of a plane in the SKL DDB and wm result
> arrays. Primary
> - * plane is always in slot 0, cursor is always in slot
> I915_MAX_PLANES-1, and
> - * other universal planes are in indices 1..n. Note that this may
> leave unused
> - * indices between the top "sprite" plane and the cursor.
> + * plane is always in slot 0 and other universal planes are in
> indices 1..n.
> */
> static int
> skl_wm_plane_id(const struct intel_plane *plane)
> @@ -2874,7 +2872,6 @@ skl_wm_plane_id(const struct intel_plane
> *plane)
> case DRM_PLANE_TYPE_PRIMARY:
> return 0;
> case DRM_PLANE_TYPE_CURSOR:
> - return PLANE_CURSOR;
> case DRM_PLANE_TYPE_OVERLAY:
> return plane->plane + 1;
> default:
> @@ -3128,14 +3125,6 @@ skl_ddb_get_pipe_allocation_limits(struct
> drm_device *dev,
> alloc->end = alloc->start + pipe_size;
> }
>
> -static unsigned int skl_cursor_allocation(int num_active)
> -{
> - if (num_active == 1)
> - return 32;
> -
> - return 8;
> -}
> -
> static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry,
> u32 reg)
> {
> entry->start = reg & 0x3ff;
> @@ -3166,10 +3155,6 @@ void skl_ddb_get_hw_state(struct
> drm_i915_private *dev_priv,
> val);
> }
>
> - val = I915_READ(CUR_BUF_CFG(pipe));
> - skl_ddb_entry_init_from_hw(&ddb-
> >plane[pipe][PLANE_CURSOR],
> - val);
> -
> intel_display_power_put(dev_priv, power_domain);
> }
> }
> @@ -3227,8 +3212,6 @@ skl_plane_relative_data_rate(const struct
> intel_crtc_state *cstate,
>
> if (!intel_pstate->base.visible)
> return 0;
> - if (pstate->plane->type == DRM_PLANE_TYPE_CURSOR)
> - return 0;
> if (y && format != DRM_FORMAT_NV12)
> return 0;
>
> @@ -3386,7 +3369,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state
> *cstate,
> struct drm_plane_state *pstate;
> enum pipe pipe = intel_crtc->pipe;
> struct skl_ddb_entry *alloc = &cstate->wm.skl.ddb;
> - uint16_t alloc_size, start, cursor_blocks;
> + uint16_t alloc_size, start;
> uint16_t *minimum = cstate->wm.skl.minimum_blocks;
> uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
> unsigned int total_data_rate;
> @@ -3412,12 +3395,6 @@ skl_allocate_pipe_ddb(struct intel_crtc_state
> *cstate,
> return 0;
> }
>
> - cursor_blocks = skl_cursor_allocation(num_active);
> - ddb->plane[pipe][PLANE_CURSOR].start = alloc->end -
> cursor_blocks;
> - ddb->plane[pipe][PLANE_CURSOR].end = alloc->end;
> -
> - alloc_size -= cursor_blocks;
So this means that now in step 2 we're going to try to increase the
cursor DDBs beyond the current fixed sizes of 32 or 8? Aren't we going
to leave the cursor DDB way-too-big and taking space of the other DDBs
when it's just being used as a cursor?
Also, we're not going to leave the cursor DDB at the end of the buffer,
which may cause some extra DDB reallocations that we may not want.
Also, whenever someone disables the cursor we'll do a DDB reallocation,
and as far as I understand we really don't want this specific case
since it's so common.
And there's a sill-not-implemented workaround for watermarks
programming related to the memory bandwidth and it also special-cases
the cursor. Is there a way to know when the cursor is being used as a
cursor or when it's being used as a normal plane? Maybe just check it
by a size threshold?
My anxiety levels always go up whenever I see someone changing the code
in a way that makes it not match with what's written in the spec
anymore. Maybe we'll be fine with the changes, but we need to carefully
analyze the impact here, especially since watermarks are still so
fragile. Maybe we should just ping the spec authors and make them
rewrite the specs in a way that considers the cases where the cursor
plane is being used as a generic plane?
> -
> /* 1. Allocate the mininum required blocks for each active
> plane */
> for_each_plane_in_state(state, plane, pstate, i) {
> intel_plane = to_intel_plane(plane);
> @@ -3431,17 +3408,12 @@ skl_allocate_pipe_ddb(struct intel_crtc_state
> *cstate,
> y_minimum[id] = 0;
> continue;
> }
> - if (plane->type == DRM_PLANE_TYPE_CURSOR) {
> - minimum[id] = 0;
> - y_minimum[id] = 0;
> - continue;
> - }
>
> minimum[id] = skl_ddb_min_alloc(pstate, 0);
> y_minimum[id] = skl_ddb_min_alloc(pstate, 1);
> }
>
> - for (i = 0; i < PLANE_CURSOR; i++) {
> + for (i = 0; i < I915_MAX_PLANES; i++) {
> alloc_size -= minimum[i];
> alloc_size -= y_minimum[i];
> }
> @@ -3866,26 +3838,6 @@ void skl_write_plane_wm(struct intel_crtc
> *intel_crtc,
> &ddb->y_plane[pipe][plane]);
> }
>
> -void skl_write_cursor_wm(struct intel_crtc *intel_crtc,
> - const struct skl_plane_wm *wm,
> - const struct skl_ddb_allocation *ddb)
> -{
> - struct drm_crtc *crtc = &intel_crtc->base;
> - struct drm_device *dev = crtc->dev;
> - struct drm_i915_private *dev_priv = to_i915(dev);
> - int level, max_level = ilk_wm_max_level(dev_priv);
> - enum pipe pipe = intel_crtc->pipe;
> -
> - for (level = 0; level <= max_level; level++) {
> - skl_write_wm_level(dev_priv, CUR_WM(pipe, level),
> - &wm->wm[level]);
> - }
> - skl_write_wm_level(dev_priv, CUR_WM_TRANS(pipe), &wm-
> >trans_wm);
> -
> - skl_ddb_entry_write(dev_priv, CUR_BUF_CFG(pipe),
> - &ddb->plane[pipe][PLANE_CURSOR]);
> -}
> -
> bool skl_wm_level_equals(const struct skl_wm_level *l1,
> const struct skl_wm_level *l2)
> {
> @@ -4122,19 +4074,11 @@ skl_print_wm_changes(const struct
> drm_atomic_state *state)
> if (skl_ddb_entry_equal(old, new))
> continue;
>
> - if (id != PLANE_CURSOR) {
> - DRM_DEBUG_ATOMIC("[PLANE:%d:plane
> %d%c] ddb (%d - %d) -> (%d - %d)\n",
> - plane->base.id, id
> + 1,
> - pipe_name(pipe),
> - old->start, old-
> >end,
> - new->start, new-
> >end);
> - } else {
> - DRM_DEBUG_ATOMIC("[PLANE:%d:cursor
> %c] ddb (%d - %d) -> (%d - %d)\n",
> - plane->base.id,
> - pipe_name(pipe),
> - old->start, old-
> >end,
> - new->start, new-
> >end);
> - }
> + DRM_DEBUG_ATOMIC("[PLANE:%d:plane %d%c] ddb
> (%d - %d) -> (%d - %d)\n",
> + plane->base.id, id + 1,
> + pipe_name(pipe),
> + old->start, old->end,
> + new->start, new->end);
> }
> }
> }
> @@ -4235,9 +4179,6 @@ static void skl_update_wm(struct drm_crtc
> *crtc)
> for_each_universal_plane(dev_priv, pipe, plane)
> skl_write_plane_wm(intel_crtc, &pipe_wm-
> >planes[plane],
> &results->ddb, plane);
> -
> - skl_write_cursor_wm(intel_crtc, &pipe_wm-
> >planes[PLANE_CURSOR],
> - &results->ddb);
> }
>
> skl_copy_wm_for_pipe(hw_vals, results, pipe);
> @@ -4350,18 +4291,12 @@ void skl_pipe_wm_get_hw_state(struct drm_crtc
> *crtc,
> wm = &out->planes[id];
>
> for (level = 0; level <= max_level; level++) {
> - if (id != PLANE_CURSOR)
> - val = I915_READ(PLANE_WM(pipe, id,
> level));
> - else
> - val = I915_READ(CUR_WM(pipe,
> level));
> + val = I915_READ(PLANE_WM(pipe, id, level));
>
> skl_wm_level_from_reg_val(val, &wm-
> >wm[level]);
> }
>
> - if (id != PLANE_CURSOR)
> - val = I915_READ(PLANE_WM_TRANS(pipe, id));
> - else
> - val = I915_READ(CUR_WM_TRANS(pipe));
> + val = I915_READ(PLANE_WM_TRANS(pipe, id));
>
> skl_wm_level_from_reg_val(val, &wm->trans_wm);
> }
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index 43d0350..9e6406a 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -194,7 +194,7 @@ void intel_pipe_update_end(struct intel_crtc
> *crtc, struct intel_flip_work *work
> }
> }
>
> -static void
> +void
> skl_update_plane(struct drm_plane *drm_plane,
> const struct intel_crtc_state *crtc_state,
> const struct intel_plane_state *plane_state)
> @@ -285,7 +285,7 @@ skl_update_plane(struct drm_plane *drm_plane,
> POSTING_READ(PLANE_SURF(pipe, plane));
> }
>
> -static void
> +void
> skl_disable_plane(struct drm_plane *dplane, struct drm_crtc *crtc)
> {
> struct drm_device *dev = dplane->dev;
> @@ -752,7 +752,7 @@ ilk_disable_plane(struct drm_plane *plane, struct
> drm_crtc *crtc)
> POSTING_READ(DVSSURF(pipe));
> }
>
> -static int
> +int
> intel_check_sprite_plane(struct drm_plane *plane,
> struct intel_crtc_state *crtc_state,
> struct intel_plane_state *state)
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