[PATCH 05/18] drm/i915: Initialize color manager and add gamma correction
Matt Roper
matthew.d.roper at intel.com
Fri Aug 21 15:40:18 PDT 2015
On Thu, Aug 06, 2015 at 10:08:14PM +0530, Shashank Sharma wrote:
> From: Kausal Malladi <kausalmalladi at gmail.com>
>
> As per Color Manager design, each driver is responsible to load its
> palette color correction and enhancement capabilities in the form of
> a DRM blob property, so that user space can query and read.
>
> This patch does the following:
> 1. Create new files intel_color_manager(.c/.h)
> 2. Attach CRTC Palette Capabilities property to CRTC
> 3. Load all CHV platform specific gamma color capabilities
> for CRTC into a blob that can be accessible by user space to
> query capabilities via DRM property interface.
>
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> Signed-off-by: Kausal Malladi <kausalmalladi at gmail.com>
> ---
> drivers/gpu/drm/i915/Makefile | 3 +-
> drivers/gpu/drm/i915/intel_color_manager.c | 83 ++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_color_manager.h | 33 ++++++++++++
> drivers/gpu/drm/i915/intel_display.c | 2 +
> drivers/gpu/drm/i915/intel_drv.h | 4 ++
> 5 files changed, 124 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/i915/intel_color_manager.c
> create mode 100644 drivers/gpu/drm/i915/intel_color_manager.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 41fb8a9..303b903 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -60,7 +60,8 @@ i915-y += intel_audio.o \
> intel_overlay.o \
> intel_psr.o \
> intel_sideband.o \
> - intel_sprite.o
> + intel_sprite.o \
> + intel_color_manager.o
> i915-$(CONFIG_ACPI) += intel_acpi.o intel_opregion.o
> i915-$(CONFIG_DRM_I915_FBDEV) += intel_fbdev.o
>
> diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
> new file mode 100644
> index 0000000..1c9c477
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_color_manager.c
> @@ -0,0 +1,83 @@
> +/*
> + * Copyright © 2015 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + * Shashank Sharma <shashank.sharma at intel.com>
> + * Kausal Malladi <Kausal.Malladi at intel.com>
> + */
> +
> +#include "intel_color_manager.h"
> +
> +int get_chv_pipe_gamma_capabilities(struct drm_device *dev,
> + struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
> +{
> + struct drm_property_blob *blob;
> +
> + /*
> + * This function exposes best capability for DeGamma and Gamma
> + * For CHV, the DeGamma LUT has 65 entries
> + * and the best Gamma capability has 257 entries (CGM unit)
> + */
> + palette_caps->version = CHV_PALETTE_STRUCT_VERSION;
> + palette_caps->num_samples_before_ctm =
> + CHV_DEGAMMA_MAX_VALS;
> + palette_caps->num_samples_after_ctm =
> + CHV_10BIT_GAMMA_MAX_VALS;
> +
> + blob = drm_property_create_blob(dev, sizeof(struct drm_palette_caps),
> + (const void *) palette_caps);
> +
> + if (blob)
> + return blob->base.id;
It's a corner case, but blob could be a non-NULL error code here (e.g.,
-ENOMEM). We should probably check for that before we try to
dereference it.
> +
> + return 0;
> +}
> +
> +int get_pipe_gamma_capabilities(struct drm_device *dev,
> + struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
> +{
> + if (IS_CHERRYVIEW(dev))
> + return get_chv_pipe_gamma_capabilities(dev, palette_caps, crtc);
> + return -EINVAL;
We only call this function in the IS_CHERRYVIEW case at the moment, so I
realize the EINVAL return is technically dead code, but going forward
would it make more sense to return a valid capabilities blob that
explicitly tells userspace we have no capabilities?
> +}
> +
> +void intel_attach_color_properties_to_crtc(struct drm_device *dev,
> + struct drm_mode_object *mode_obj)
> +{
> + struct drm_mode_config *config = &dev->mode_config;
> + struct drm_palette_caps *palette_caps;
> + struct drm_crtc *crtc;
> + int capabilities_blob_id;
> +
> + if (IS_CHERRYVIEW(dev)) {
> + crtc = obj_to_crtc(mode_obj);
> +
> + palette_caps = kzalloc(sizeof(struct drm_palette_caps),
> + GFP_KERNEL);
> + capabilities_blob_id = get_pipe_gamma_capabilities(dev, palette_caps, crtc);
> + kfree(palette_caps);
> + if (config->cm_crtc_palette_capabilities_property)
> + drm_object_attach_property(mode_obj,
> + config->cm_crtc_palette_capabilities_property,
> + capabilities_blob_id);
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
> new file mode 100644
> index 0000000..51aeb91
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_color_manager.h
> @@ -0,0 +1,33 @@
> +/*
> + * Copyright © 2015 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + * Shashank Sharma <shashank.sharma at intel.com>
> + * Kausal Malladi <Kausal.Malladi at intel.com>
> + */
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc_helper.h>
> +#include "i915_drv.h"
> +
> +#define CHV_PALETTE_STRUCT_VERSION 1
> +#define CHV_DEGAMMA_MAX_VALS 65
> +#define CHV_10BIT_GAMMA_MAX_VALS 257
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1412e21..349a1c2 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13975,6 +13975,8 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
>
> intel_crtc->wm.cxsr_allowed = true;
>
> + intel_attach_color_properties_to_crtc(dev, &intel_crtc->base.base);
> +
I feel like we should hold off on actually calling this function until
the very end of your patch series. If someone is bisecting through
histroy to track down a bug and they land on this commit, we'll be
advertising some capabilities to userspace that you don't really have
yet (since they only show up in the later patches of the series).
If we wait until the end of the series to "flip the switch" and enable
color management, then we don't have to worry about running partially
implemented features during a bisect session.
Matt
> BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
> dev_priv->plane_to_crtc_mapping[intel_crtc->plane] != NULL);
> dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index b3dc138..dee5f91 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1438,4 +1438,8 @@ void intel_plane_destroy_state(struct drm_plane *plane,
> struct drm_plane_state *state);
> extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
>
> +/* intel_color_manager.c */
> +void intel_attach_color_properties_to_crtc(struct drm_device *dev,
> + struct drm_mode_object *mode_obj);
> +
> #endif /* __INTEL_DRV_H__ */
> --
> 1.9.1
>
--
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
More information about the dri-devel
mailing list