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Message-Id: <1497986735-14418-2-git-send-email-peda@axentia.se>
Date: Tue, 20 Jun 2017 21:25:25 +0200
From: Peter Rosin <peda@...ntia.se>
To: linux-kernel@...r.kernel.org
Cc: Peter Rosin <peda@...ntia.se>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...ux.ie>,
Dave Airlie <airlied@...hat.com>,
Gerd Hoffmann <kraxel@...hat.com>,
Daniel Vetter <daniel.vetter@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Sean Paul <seanpaul@...omium.org>,
Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
Ben Skeggs <bskeggs@...hat.com>,
Yannick Fertre <yannick.fertre@...com>,
Philippe Cornu <philippe.cornu@...com>,
Benjamin Gaignard <benjamin.gaignard@...aro.org>,
Vincent Abriou <vincent.abriou@...com>,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
virtualization@...ts.linux-foundation.org,
intel-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH 01/11] drm/fb-helper: do a generic fb_setcmap helper in terms of crtc .gamma_set
This makes the redundant fb helpers .load_lut, .gamma_set and .gamma_get
totally obsolete.
I think the gamma_store can end up invalid on error. But the way I read
it, that can happen in drm_mode_gamma_set_ioctl as well, so why should
this pesky legacy fbdev stuff be any better?
drm_fb_helper_save_lut_atomic justs saves the gamma lut for later. However,
it saves it to the gamma_store which should already be up to date with what
.gamma_get would return and is thus a nop. So, zap it.
Signed-off-by: Peter Rosin <peda@...ntia.se>
---
drivers/gpu/drm/drm_fb_helper.c | 131 ++++++++++++----------------------------
1 file changed, 40 insertions(+), 91 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 574af01..cc2d55d 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -229,22 +229,6 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
}
EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);
-static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
-{
- uint16_t *r_base, *g_base, *b_base;
- int i;
-
- if (helper->funcs->gamma_get == NULL)
- return;
-
- r_base = crtc->gamma_store;
- g_base = r_base + crtc->gamma_size;
- b_base = g_base + crtc->gamma_size;
-
- for (i = 0; i < crtc->gamma_size; i++)
- helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
-}
-
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
@@ -285,7 +269,6 @@ int drm_fb_helper_debug_enter(struct fb_info *info)
if (drm_drv_uses_atomic_modeset(mode_set->crtc->dev))
continue;
- drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb,
mode_set->x,
@@ -1167,50 +1150,6 @@ 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;
-
- if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
- u32 *palette;
- u32 value;
- /* place color in psuedopalette */
- if (regno > 16)
- return -EINVAL;
- palette = (u32 *)info->pseudo_palette;
- red >>= (16 - info->var.red.length);
- green >>= (16 - info->var.green.length);
- blue >>= (16 - info->var.blue.length);
- value = (red << info->var.red.offset) |
- (green << info->var.green.offset) |
- (blue << info->var.blue.offset);
- if (info->var.transp.length > 0) {
- u32 mask = (1 << info->var.transp.length) - 1;
-
- mask <<= info->var.transp.offset;
- value |= mask;
- }
- palette[regno] = value;
- return 0;
- }
-
- /*
- * 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;
-}
-
/**
* drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
* @cmap: cmap to set
@@ -1220,51 +1159,61 @@ int drm_fb_helper_setcmap(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_modeset_acquire_ctx ctx;
struct drm_crtc *crtc;
- int i, j, rc = 0;
- int start;
+ u16 *r, *g, *b;
+ int i, ret;
if (oops_in_progress)
return -EBUSY;
- drm_modeset_lock_all(dev);
+ if (cmap->start + cmap->len < cmap->start)
+ return -EINVAL;
+
+ drm_modeset_acquire_init(&ctx, 0);
+retry:
+ ret = drm_modeset_lock_all_ctx(dev, &ctx);
+ if (ret)
+ goto out;
if (!drm_fb_helper_is_bound(fb_helper)) {
- drm_modeset_unlock_all(dev);
- return -EBUSY;
+ ret = -EBUSY;
+ goto out;
}
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
- crtc_funcs = crtc->helper_private;
-
- red = cmap->red;
- green = cmap->green;
- blue = cmap->blue;
- transp = cmap->transp;
- start = cmap->start;
+ if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
+ ret = -EINVAL;
+ goto out;
+ }
- for (j = 0; j < cmap->len; j++) {
- u16 hred, hgreen, hblue, htransp = 0xffff;
+ if (cmap->start + cmap->len > crtc->gamma_size) {
+ ret = -EINVAL;
+ goto out;
+ }
- hred = *red++;
- hgreen = *green++;
- hblue = *blue++;
+ r = crtc->gamma_store;
+ g = r + crtc->gamma_size;
+ b = g + crtc->gamma_size;
- if (transp)
- htransp = *transp++;
+ memcpy(r + cmap->start, cmap->red, cmap->len * sizeof(u16));
+ memcpy(g + cmap->start, cmap->green, cmap->len * sizeof(u16));
+ memcpy(b + cmap->start, cmap->blue, cmap->len * sizeof(u16));
- rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
- if (rc)
- goto out;
- }
- if (crtc_funcs->load_lut)
- crtc_funcs->load_lut(crtc);
+ ret = crtc->funcs->gamma_set(crtc, r, g, b,
+ crtc->gamma_size, &ctx);
+ if (ret)
+ break;
}
- out:
- drm_modeset_unlock_all(dev);
- return rc;
+out:
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(&ctx);
+ goto retry;
+ }
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+
+ return ret;
}
EXPORT_SYMBOL(drm_fb_helper_setcmap);
--
2.1.4
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