On Thu, Dec 10, 2020 at 04:27:39PM +0100, Daniel Vetter wrote:
> On Thu, Dec 10, 2020 at 04:08:51PM +0200, Tomi Valkeinen wrote:
> > To support legacy gamma ioctls the drivers need to set
> > drm_crtc_funcs.gamma_set either to a custom implementation or to
> > drm_atomic_helper_legacy_gamma_set. Most of the atomic drivers do the
> > latter.
> >
> > We can simplify this by making the core handle it automatically.
> >
> > Add three functions to drm_color_mgmt.c:
> >
> > drm_crtc_supports_legacy_gamma() which tells if the driver supports
> > setting the legacy gamma.
> >
> > drm_crtc_gamma_ramp_set() which sets the given gamma ramp to GAMMA_LUT
> > and resets DEGAMMA_LUT and CTM.
> >
> > drm_crtc_legacy_gamma_set() which sets the given gamma ramp values
> > either using drm_crtc_funcs.gamma_set or drm_crtc_gamma_ramp_set().
> >
> > These functions are used from the drm_mode_gamma_set_ioctl, and from
> > drm_fb_helper.c when it is dealing with fbdev cmap.
> >
> > We can then drop drm_atomic_helper_legacy_gamma_set() and remove all its
> > uses.
> >
> > Note that we need to EXPORT_SYMBOL all the new functions as they are
> > used from drm_fb_helper, but they are declared in drm_crtc_internal.h as
> > they are not supposed to be used by the drivers.
> >
> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> > ---
> > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 -
> > .../gpu/drm/arm/display/komeda/komeda_crtc.c | 1 -
> > drivers/gpu/drm/arm/malidp_crtc.c | 1 -
> > drivers/gpu/drm/armada/armada_crtc.c | 1 -
> > drivers/gpu/drm/ast/ast_mode.c | 1 -
> > .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 1 -
> > drivers/gpu/drm/drm_atomic_helper.c | 70 ---------
> > drivers/gpu/drm/drm_color_mgmt.c | 138 ++++++++++++++++--
> > drivers/gpu/drm/drm_crtc_internal.h | 10 ++
> > drivers/gpu/drm/drm_fb_helper.c | 28 ++--
> > drivers/gpu/drm/i915/display/intel_display.c | 1 -
> > drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 2 -
> > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 1 -
> > drivers/gpu/drm/nouveau/dispnv50/head.c | 2 -
> > drivers/gpu/drm/omapdrm/omap_crtc.c | 1 -
> > drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 1 -
> > drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 1 -
> > drivers/gpu/drm/stm/ltdc.c | 1 -
> > drivers/gpu/drm/vc4/vc4_crtc.c | 1 -
> > drivers/gpu/drm/vc4/vc4_txp.c | 1 -
> > include/drm/drm_atomic_helper.h | 4 -
> > include/drm/drm_color_mgmt.h | 1 -
> > 22 files changed, 148 insertions(+), 121 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > index 2855bb918535..848b06c51b0e 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> > @@ -5396,7 +5396,6 @@ static void dm_disable_vblank(struct drm_crtc *crtc)
> > static const struct drm_crtc_funcs amdgpu_dm_crtc_funcs = {
> > .reset = dm_crtc_reset_state,
> > .destroy = amdgpu_dm_crtc_destroy,
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > .set_config = drm_atomic_helper_set_config,
> > .page_flip = drm_atomic_helper_page_flip,
> > .atomic_duplicate_state = dm_crtc_duplicate_state,
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > index 4b485eb512e2..59172acb9738 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > @@ -550,7 +550,6 @@ static void komeda_crtc_vblank_disable(struct drm_crtc *crtc)
> > }
> >
> > static const struct drm_crtc_funcs komeda_crtc_funcs = {
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > .destroy = drm_crtc_cleanup,
> > .set_config = drm_atomic_helper_set_config,
> > .page_flip = drm_atomic_helper_page_flip,
> > diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
> > index 108e7a31bd26..494075ddbef6 100644
> > --- a/drivers/gpu/drm/arm/malidp_crtc.c
> > +++ b/drivers/gpu/drm/arm/malidp_crtc.c
> > @@ -510,7 +510,6 @@ static void malidp_crtc_disable_vblank(struct drm_crtc *crtc)
> > }
> >
> > static const struct drm_crtc_funcs malidp_crtc_funcs = {
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > .destroy = drm_crtc_cleanup,
> > .set_config = drm_atomic_helper_set_config,
> > .page_flip = drm_atomic_helper_page_flip,
> > diff --git a/drivers/gpu/drm/armada/armada_crtc.c b/drivers/gpu/drm/armada/armada_crtc.c
> > index 3ebcf5a52c8b..b7bb90ae787f 100644
> > --- a/drivers/gpu/drm/armada/armada_crtc.c
> > +++ b/drivers/gpu/drm/armada/armada_crtc.c
> > @@ -820,7 +820,6 @@ static const struct drm_crtc_funcs armada_crtc_funcs = {
> > .cursor_set = armada_drm_crtc_cursor_set,
> > .cursor_move = armada_drm_crtc_cursor_move,
> > .destroy = armada_drm_crtc_destroy,
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > .set_config = drm_atomic_helper_set_config,
> > .page_flip = drm_atomic_helper_page_flip,
> > .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> > diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
> > index 9db371f4054f..5b0ec785c516 100644
> > --- a/drivers/gpu/drm/ast/ast_mode.c
> > +++ b/drivers/gpu/drm/ast/ast_mode.c
> > @@ -903,7 +903,6 @@ static void ast_crtc_atomic_destroy_state(struct drm_crtc *crtc,
> >
> > static const struct drm_crtc_funcs ast_crtc_funcs = {
> > .reset = ast_crtc_reset,
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > .destroy = drm_crtc_cleanup,
> > .set_config = drm_atomic_helper_set_config,
> > .page_flip = drm_atomic_helper_page_flip,
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > index c58fa00b4848..05ad75d155e8 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > @@ -473,7 +473,6 @@ static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
> > .atomic_destroy_state = atmel_hlcdc_crtc_destroy_state,
> > .enable_vblank = atmel_hlcdc_crtc_enable_vblank,
> > .disable_vblank = atmel_hlcdc_crtc_disable_vblank,
> > - .gamma_set = drm_atomic_helper_legacy_gamma_set,
> > };
> >
> > int atmel_hlcdc_crtc_create(struct drm_device *dev)
> > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> > index ba1507036f26..b114658100b3 100644
> > --- a/drivers/gpu/drm/drm_atomic_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_helper.c
> > @@ -3499,76 +3499,6 @@ int drm_atomic_helper_page_flip_target(struct drm_crtc *crtc,
> > }
> > EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
> >
> > -/**
> > - * drm_atomic_helper_legacy_gamma_set - set the legacy gamma correction table
> > - * @crtc: CRTC object
> > - * @red: red correction table
> > - * @green: green correction table
> > - * @blue: green correction table
> > - * @size: size of the tables
> > - * @ctx: lock acquire context
> > - *
> > - * Implements support for legacy gamma correction table for drivers
> > - * that support color management through the DEGAMMA_LUT/GAMMA_LUT
> > - * properties. See drm_crtc_enable_color_mgmt() and the containing chapter for
> > - * how the atomic color management and gamma tables work.
> > - */
> > -int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
> > - u16 *red, u16 *green, u16 *blue,
> > - uint32_t size,
> > - struct drm_modeset_acquire_ctx *ctx)
> > -{
> > - struct drm_device *dev = crtc->dev;
> > - struct drm_atomic_state *state;
> > - struct drm_crtc_state *crtc_state;
> > - struct drm_property_blob *blob = NULL;
> > - struct drm_color_lut *blob_data;
> > - int i, ret = 0;
> > - bool replaced;
> > -
> > - state = drm_atomic_state_alloc(crtc->dev);
> > - if (!state)
> > - return -ENOMEM;
> > -
> > - blob = drm_property_create_blob(dev,
> > - sizeof(struct drm_color_lut) * size,
> > - NULL);
> > - if (IS_ERR(blob)) {
> > - ret = PTR_ERR(blob);
> > - blob = NULL;
> > - goto fail;
> > - }
> > -
> > - /* Prepare GAMMA_LUT with the legacy values. */
> > - blob_data = blob->data;
> > - for (i = 0; i < size; i++) {
> > - blob_data[i].red = red[i];
> > - blob_data[i].green = green[i];
> > - blob_data[i].blue = blue[i];
> > - }
> > -
> > - state->acquire_ctx = ctx;
> > - crtc_state = drm_atomic_get_crtc_state(state, crtc);
> > - if (IS_ERR(crtc_state)) {
> > - ret = PTR_ERR(crtc_state);
> > - goto fail;
> > - }
> > -
> > - /* Reset DEGAMMA_LUT and CTM properties. */
> > - replaced = drm_property_replace_blob(&crtc_state->degamma_lut, NULL);
> > - replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
> > - replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, blob);
> > - crtc_state->color_mgmt_changed |= replaced;
> > -
> > - ret = drm_atomic_commit(state);
> > -
> > -fail:
> > - drm_atomic_state_put(state);
> > - drm_property_blob_put(blob);
> > - return ret;
> > -}
> > -EXPORT_SYMBOL(drm_atomic_helper_legacy_gamma_set);
> > -
> > /**
> > * drm_atomic_helper_bridge_propagate_bus_fmt() - Propagate output format to
> > * the input end of a bridge
> > diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
> > index 3bcabc2f6e0e..c4e4d59c4432 100644
> > --- a/drivers/gpu/drm/drm_color_mgmt.c
> > +++ b/drivers/gpu/drm/drm_color_mgmt.c
> > @@ -22,6 +22,7 @@
> >
> > #include <linux/uaccess.h>
> >
> > +#include <drm/drm_atomic.h>
> > #include <drm/drm_color_mgmt.h>
> > #include <drm/drm_crtc.h>
> > #include <drm/drm_device.h>
> > @@ -89,9 +90,8 @@
> > * modes) appropriately.
> > *
> > * There is also support for a legacy gamma table, which is set up by calling
> > - * drm_mode_crtc_set_gamma_size(). Drivers which support both should use
> > - * drm_atomic_helper_legacy_gamma_set() to alias the legacy gamma ramp with the
> > - * "GAMMA_LUT" property above.
> > + * drm_mode_crtc_set_gamma_size(). The DRM core will then alias the legacy gamma
> > + * ramp with "GAMMA_LUT".
> > *
> > * Support for different non RGB color encodings is controlled through
> > * &drm_plane specific COLOR_ENCODING and COLOR_RANGE properties. They
> > @@ -156,9 +156,6 @@ EXPORT_SYMBOL(drm_color_ctm_s31_32_to_qm_n);
> > * optional. The gamma and degamma properties are only attached if
> > * their size is not 0 and ctm_property is only attached if has_ctm is
> > * true.
> > - *
> > - * Drivers should use drm_atomic_helper_legacy_gamma_set() to implement the
> > - * legacy &drm_crtc_funcs.gamma_set callback.
> > */
> > void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
> > uint degamma_lut_size,
> > @@ -231,6 +228,129 @@ int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
> > }
> > EXPORT_SYMBOL(drm_mode_crtc_set_gamma_size);
> >
> > +/**
> > + * drm_crtc_supports_legacy_gamma - does the crtc support legacy gamma correction table
> > + * @crtc: CRTC object
> > + *
> > + * Returns true/false if the given crtc supports setting the legacy gamma
> > + * correction table.
> > + */
> > +bool drm_crtc_supports_legacy_gamma(struct drm_crtc *crtc)
> > +{
> > + uint32_t gamma_id = crtc->dev->mode_config.gamma_lut_property->base.id;
> > +
> > + if (!crtc->gamma_size)
> > + return false;
> > +
> > + if (crtc->funcs->gamma_set)
> > + return true;
> > +
> > + return !!drm_mode_obj_find_prop_id(&crtc->base, gamma_id);
> > +}
> > +EXPORT_SYMBOL(drm_crtc_supports_legacy_gamma);
> > +
> > +/**
> > + * drm_crtc_gamma_ramp_set - set gamma ramp using GAMMA_LUT property
> > + * @state: atomic state to which the gamma ramp is set
> > + * @crtc: CRTC object
> > + * @blob: property blob for the gamma ramp
> > + *
> > + * Set given gamma ramp to the crtc using GAMMA_LUT property and resetting
> > + * DEGAMMA_LUT and CTM.
> > + */
> > +int drm_crtc_gamma_ramp_set(struct drm_atomic_state *state, struct drm_crtc *crtc,
> > + struct drm_property_blob *blob)
> > +{
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_property_blob *gamma_blob;
> > + struct drm_property_blob *degamma_blob;
> > + bool replaced;
> > +
> > + gamma_blob = blob;
> > + degamma_blob = NULL;
> > +
> > + crtc_state = drm_atomic_get_crtc_state(state, crtc);
> > + if (IS_ERR(crtc_state))
> > + return PTR_ERR(crtc_state);
> > +
> > + /* Set GAMMA_LUT and reset DEGAMMA_LUT and CTM */
> > + replaced = drm_property_replace_blob(&crtc_state->degamma_lut, degamma_blob);
> > + replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
> > + replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, gamma_blob);
> > + crtc_state->color_mgmt_changed |= replaced;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_crtc_gamma_ramp_set);
> > +
> > +/**
> > + * drm_crtc_legacy_gamma_set - set the legacy gamma correction table
> > + * @crtc: CRTC object
> > + * @red: red correction table
> > + * @green: green correction table
> > + * @blue: green correction table
> > + * @size: size of the tables
> > + * @ctx: lock acquire context
> > + *
> > + * Implements support for legacy gamma correction table for drivers
> > + * that have set drm_crtc_funcs.gamma_set or that support color management
> > + * through the DEGAMMA_LUT/GAMMA_LUT properties. See
> > + * drm_crtc_enable_color_mgmt() and the containing chapter for
> > + * how the atomic color management and gamma tables work.
> > + *
> > + * This function sets the gamma using drm_crtc_funcs.gamma_set if set, or
> > + * alternatively using crtc color management properties.
> > + */
> > +int drm_crtc_legacy_gamma_set(struct drm_crtc *crtc,
> > + u16 *red, u16 *green, u16 *blue,
> > + uint32_t size,
> > + struct drm_modeset_acquire_ctx *ctx)
> > +{
> > + struct drm_device *dev = crtc->dev;
> > + struct drm_atomic_state *state;
> > + struct drm_property_blob *blob;
> > + struct drm_color_lut *blob_data;
> > + int i, ret = 0;
> > +
> > + if (crtc->funcs->gamma_set)
> > + return crtc->funcs->gamma_set(crtc, red, green, blue, size, ctx);
> > +
> > + state = drm_atomic_state_alloc(crtc->dev);
> > + if (!state)
> > + return -ENOMEM;
> > +
> > + blob = drm_property_create_blob(dev,
> > + sizeof(struct drm_color_lut) * size,
> > + NULL);
> > + if (IS_ERR(blob)) {
> > + ret = PTR_ERR(blob);
> > + blob = NULL;
> > + goto fail;
> > + }
> > +
> > + /* Prepare GAMMA_LUT with the legacy values. */
> > + blob_data = blob->data;
> > + for (i = 0; i < size; i++) {
> > + blob_data[i].red = red[i];
> > + blob_data[i].green = green[i];
> > + blob_data[i].blue = blue[i];
> > + }
> > +
> > + state->acquire_ctx = ctx;
> > +
> > + ret = drm_crtc_gamma_ramp_set(state, crtc, blob);
> > + if (ret)
> > + goto fail;
> > +
> > + ret = drm_atomic_commit(state);
> > +
> > +fail:
> > + drm_atomic_state_put(state);
> > + drm_property_blob_put(blob);
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(drm_crtc_legacy_gamma_set);
> > +
> > /**
> > * drm_mode_gamma_set_ioctl - set the gamma table
> > * @dev: DRM device
> > @@ -262,7 +382,7 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
> > if (!crtc)
> > return -ENOENT;
> >
> > - if (crtc->funcs->gamma_set == NULL)
> > + if (!drm_crtc_supports_legacy_gamma(crtc))
> > return -ENOSYS;
> >
> > /* memcpy into gamma store */
> > @@ -290,8 +410,8 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
> > goto out;
> > }
> >
> > - ret = crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
> > - crtc->gamma_size, &ctx);
> > + ret = drm_crtc_legacy_gamma_set(crtc, r_base, g_base, b_base,
> > + crtc->gamma_size, &ctx);
> >
> > out:
> > DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
> > diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
> > index 54d4cf1233e9..74856df6482a 100644
> > --- a/drivers/gpu/drm/drm_crtc_internal.h
> > +++ b/drivers/gpu/drm/drm_crtc_internal.h
> > @@ -51,9 +51,11 @@ struct drm_mode_fb_cmd2;
> > struct drm_mode_fb_cmd;
> > struct drm_mode_object;
> > struct drm_mode_set;
> > +struct drm_modeset_acquire_ctx;
> > struct drm_plane;
> > struct drm_plane_state;
> > struct drm_property;
> > +struct drm_property_blob;
> > struct edid;
> > struct kref;
> > struct work_struct;
> > @@ -114,6 +116,14 @@ int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
> > const char *drm_get_color_encoding_name(enum drm_color_encoding encoding);
> > const char *drm_get_color_range_name(enum drm_color_range range);
> >
> > +bool drm_crtc_supports_legacy_gamma(struct drm_crtc *crtc);
> > +int drm_crtc_gamma_ramp_set(struct drm_atomic_state *state, struct drm_crtc *crtc,
> > + struct drm_property_blob *blob);
> > +int drm_crtc_legacy_gamma_set(struct drm_crtc *crtc,
> > + u16 *red, u16 *green, u16 *blue,
> > + uint32_t size,
> > + struct drm_modeset_acquire_ctx *ctx);
> > +
> > /* IOCTLs */
> > int drm_mode_gamma_get_ioctl(struct drm_device *dev,
> > void *data, struct drm_file *file_priv);
> > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> > index e82db0f4e771..80e3797f0f01 100644
> > --- a/drivers/gpu/drm/drm_fb_helper.c
> > +++ b/drivers/gpu/drm/drm_fb_helper.c
> > @@ -46,6 +46,7 @@
> > #include <drm/drm_print.h>
> > #include <drm/drm_vblank.h>
> >
> > +#include "drm_crtc_internal.h"
>
> So this is a bit annoying, because thus far we managed to have a very
> clear split between core and helpers. And I think we can keep that.
>
> > #include "drm_crtc_helper_internal.h"
> > #include "drm_internal.h"
> >
> > @@ -136,15 +137,15 @@ static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
> > {
> > uint16_t *r_base, *g_base, *b_base;
> >
> > - if (crtc->funcs->gamma_set == NULL)
> > + if (!drm_crtc_supports_legacy_gamma(crtc))
> > return;
> >
> > r_base = crtc->gamma_store;
> > g_base = r_base + crtc->gamma_size;
> > b_base = g_base + crtc->gamma_size;
> >
> > - crtc->funcs->gamma_set(crtc, r_base, g_base, b_base,
> > - crtc->gamma_size, NULL);
> > + drm_crtc_legacy_gamma_set(crtc, r_base, g_base, b_base,
> > + crtc->gamma_size, NULL);
>
> This is only used by legacy non-atomic drivers. It's pretty much
> impossible to make kgdb work with atomic drivers, so really let's just not
> bother and keep the code as-is.
>
> > }
> >
> > /**
> > @@ -946,7 +947,7 @@ static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
> > drm_modeset_lock_all(fb_helper->dev);
> > drm_client_for_each_modeset(modeset, &fb_helper->client) {
> > crtc = modeset->crtc;
> > - if (!crtc->funcs->gamma_set || !crtc->gamma_size) {
> > + if (!drm_crtc_supports_legacy_gamma(crtc)) {
> > ret = -EINVAL;
> > goto out;
> > }
> > @@ -964,8 +965,8 @@ static int setcmap_legacy(struct fb_cmap *cmap, struct fb_info *info)
> > 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);
> > + ret = drm_crtc_legacy_gamma_set(crtc, r, g, b, crtc->gamma_size,
> > + NULL);
> > if (ret)
> > goto out;
>
> Same here.
>
> > }
> > @@ -1024,12 +1025,10 @@ static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
> > struct drm_device *dev = fb_helper->dev;
> > struct drm_property_blob *gamma_lut = NULL;
> > struct drm_modeset_acquire_ctx ctx;
> > - struct drm_crtc_state *crtc_state;
> > struct drm_atomic_state *state;
> > struct drm_mode_set *modeset;
> > struct drm_crtc *crtc;
> > u16 *r, *g, *b;
> > - bool replaced;
> > int ret = 0;
> >
> > drm_modeset_acquire_init(&ctx, 0);
> > @@ -1053,18 +1052,9 @@ static int setcmap_atomic(struct fb_cmap *cmap, struct fb_info *info)
> > goto out_state;
> > }
> >
> > - crtc_state = drm_atomic_get_crtc_state(state, crtc);
> > - if (IS_ERR(crtc_state)) {
> > - ret = PTR_ERR(crtc_state);
> > + ret = drm_crtc_gamma_ramp_set(state, crtc, gamma_lut);
> > + if (ret)
>
> You're nesting an atomic commit in an atomic commit here, that will go
> boom. I guess ideally we'd move this into drm_client_modeset so it
> remembers the fbdev gamma ramp and does it all in one go.
IIRC that's pretty much what's in my branch that I mentioned earlier.
Mentioning it again in case someone wants a leg up for implementing
this idea ;)
--
Ville Syrjälä
Intel
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