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Subject[PATCH v4 03/14] drm/fb-helper: separate the fb_setcmap helper into atomic and legacy paths
Date
The legacy path implements setcmap in terms of crtc .gamma_set.

The atomic path implements setcmap by directly updating the crtc gamma_lut
property.

This has a couple of benefits:
- it makes the redundant fb helpers .load_lut, .gamma_set and .gamma_get
completely obsolete. They are now unused and subject for removal.
- atomic drivers that support clut modes get fbdev support for those from
the drm core. This includes atmel-hlcdc, but perhaps others as well?

Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/gpu/drm/drm_fb_helper.c | 232 ++++++++++++++++++++++++++++------------
1 file changed, 161 insertions(+), 71 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 721511d..32d6ea1 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1195,27 +1195,6 @@ void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
}
EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked);

-static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
- u16 blue, u16 regno, struct fb_info *info)
-{
- struct drm_fb_helper *fb_helper = info->par;
- struct drm_framebuffer *fb = fb_helper->fb;
-
- /*
- * The driver really shouldn't advertise pseudo/directcolor
- * visuals if it can't deal with the palette.
- */
- if (WARN_ON(!fb_helper->funcs->gamma_set ||
- !fb_helper->funcs->gamma_get))
- return -EINVAL;
-
- WARN_ON(fb->format->cpp[0] != 1);
-
- fb_helper->funcs->gamma_set(crtc, red, green, blue, regno);
-
- return 0;
-}
-
static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
{
u32 *palette = (u32 *)info->pseudo_palette;
@@ -1248,57 +1227,140 @@ static int setcmap_pseudo_palette(struct fb_cmap *cmap, struct fb_info *info)
return 0;
}

-/**
- * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
- * @cmap: cmap to set
- * @info: fbdev registered by the helper
- */
-int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
+static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
- struct drm_device *dev = fb_helper->dev;
- const struct drm_crtc_helper_funcs *crtc_funcs;
- u16 *red, *green, *blue, *transp;
struct drm_crtc *crtc;
u16 *r, *g, *b;
- int i, j, rc = 0;
- int start;
+ int i, ret = 0;

- if (oops_in_progress)
- return -EBUSY;
+ drm_modeset_lock_all(fb_helper->dev);
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ crtc = fb_helper->crtc_info[i].mode_set.crtc;
+ if (!crtc->funcs->gamma_set || !crtc->gamma_size)
+ return -EINVAL;

- mutex_lock(&fb_helper->lock);
- if (!drm_fb_helper_is_bound(fb_helper)) {
- mutex_unlock(&fb_helper->lock);
- return -EBUSY;
+ if (cmap->start + cmap->len > crtc->gamma_size)
+ return -EINVAL;
+
+ r = crtc->gamma_store;
+ g = r + crtc->gamma_size;
+ b = g + crtc->gamma_size;
+
+ memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
+ memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
+ memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
+
+ ret = crtc->funcs->gamma_set(crtc, r, g, b,
+ crtc->gamma_size, NULL);
+ if (ret)
+ return ret;
}
+ drm_modeset_unlock_all(fb_helper->dev);

- drm_modeset_lock_all(dev);
- if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
- rc = setcmap_pseudo_palette(cmap, info);
- goto out;
+ return ret;
+}
+
+static struct drm_property_blob *setcmap_new_gamma_lut(struct drm_crtc *crtc,
+ struct fb_cmap *cmap)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_property_blob *gamma_lut;
+ struct drm_color_lut *lut;
+ int size = crtc->gamma_size;
+ int i;
+
+ if (!size || cmap->start + cmap->len > size)
+ return ERR_PTR(-EINVAL);
+
+ gamma_lut = drm_property_create_blob(dev, sizeof(*lut) * size, NULL);
+ if (IS_ERR(gamma_lut))
+ return gamma_lut;
+
+ lut = (struct drm_color_lut *)gamma_lut->data;
+ if (cmap->start || cmap->len != size) {
+ u16 *r = crtc->gamma_store;
+ u16 *g = r + crtc->gamma_size;
+ u16 *b = g + crtc->gamma_size;
+
+ for (i = 0; i < cmap->start; i++) {
+ lut[i].red = r[i];
+ lut[i].green = g[i];
+ lut[i].blue = b[i];
+ }
+ for (i = cmap->start + cmap->len; i < size; i++) {
+ lut[i].red = r[i];
+ lut[i].green = g[i];
+ lut[i].blue = b[i];
+ }
+ }
+
+ for (i = 0; i < cmap->len; i++) {
+ lut[cmap->start + i].red = cmap->red[i];
+ lut[cmap->start + i].green = cmap->green[i];
+ lut[cmap->start + i].blue = cmap->blue[i];
}

+ return gamma_lut;
+}
+
+static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_property_blob *gamma_lut;
+ struct drm_modeset_acquire_ctx ctx;
+ struct drm_crtc_state *crtc_state;
+ struct drm_atomic_state *state;
+ struct drm_crtc *crtc;
+ u16 *r, *g, *b;
+ int i, ret = 0;
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+ state = drm_atomic_state_alloc(dev);
+ if (!state) {
+ ret = -ENOMEM;
+ goto out_ctx;
+ }
+
+ state->acquire_ctx = &ctx;
+retry:
for (i = 0; i < fb_helper->crtc_count; i++) {
- crtc = fb_helper->crtc_info[i].mode_set.crtc;
- crtc_funcs = crtc->helper_private;
+ bool replaced = false;

- red = cmap->red;
- green = cmap->green;
- blue = cmap->blue;
- transp = cmap->transp;
- start = cmap->start;
+ crtc = fb_helper->crtc_info[i].mode_set.crtc;

- if (!crtc->gamma_size) {
- rc = -EINVAL;
- goto out;
+ gamma_lut = setcmap_new_gamma_lut(crtc, cmap);
+ if (IS_ERR(gamma_lut)) {
+ ret = PTR_ERR(gamma_lut);
+ goto out_state;
}

- if (cmap->start + cmap->len > crtc->gamma_size) {
- rc = -EINVAL;
- goto out;
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (IS_ERR(crtc_state)) {
+ drm_property_blob_put(gamma_lut);
+ ret = PTR_ERR(crtc_state);
+ goto out_state;
}

+ drm_atomic_replace_property_blob(&crtc_state->degamma_lut,
+ NULL, &replaced);
+ drm_atomic_replace_property_blob(&crtc_state->ctm,
+ NULL, &replaced);
+ drm_atomic_replace_property_blob(&crtc_state->gamma_lut,
+ gamma_lut, &replaced);
+ crtc_state->color_mgmt_changed |= replaced;
+ drm_property_blob_put(gamma_lut);
+ }
+
+ ret = drm_atomic_commit(state);
+ if (ret)
+ goto out_state;
+
+ for (i = 0; i < fb_helper->crtc_count; i++) {
+ crtc = fb_helper->crtc_info[i].mode_set.crtc;
+
r = crtc->gamma_store;
g = r + crtc->gamma_size;
b = g + crtc->gamma_size;
@@ -1306,28 +1368,56 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(*r));
memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(*g));
memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(*b));
+ }
+
+out_state:
+ if (ret == -EDEADLK)
+ goto backoff;
+
+ drm_atomic_state_put(state);
+out_ctx:
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);

- for (j = 0; j < cmap->len; j++) {
- u16 hred, hgreen, hblue, htransp = 0xffff;
+ return ret;

- hred = *red++;
- hgreen = *green++;
- hblue = *blue++;
+backoff:
+ drm_atomic_state_clear(state);
+ drm_modeset_backoff(&ctx);
+ goto retry;
+}

- if (transp)
- htransp = *transp++;
+/**
+ * drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
+ * @cmap: cmap to set
+ * @info: fbdev registered by the helper
+ */
+int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
+{
+ struct drm_fb_helper *fb_helper = info->par;
+ int ret;

- rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
- if (rc)
- goto out;
- }
- if (crtc_funcs->load_lut)
- crtc_funcs->load_lut(crtc);
+ if (oops_in_progress)
+ return -EBUSY;
+
+ mutex_lock(&fb_helper->lock);
+
+ if (!drm_fb_helper_is_bound(fb_helper)) {
+ ret = -EBUSY;
+ goto out;
}
- out:
- drm_modeset_unlock_all(dev);
+
+ if (info->fix.visual == FB_VISUAL_TRUECOLOR)
+ ret = setcmap_pseudo_palette(cmap, info);
+ else if (drm_drv_uses_atomic_modeset(fb_helper->dev))
+ ret = setcmap_atomic(cmap, info);
+ else
+ ret = setcmap_legacy(cmap, info);
+
+out:
mutex_unlock(&fb_helper->lock);
- return rc;
+
+ return ret;
}
EXPORT_SYMBOL(drm_fb_helper_setcmap);

--
2.1.4
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