RE: [RFC v4 1/8] drm: Add Enhanced Gamma LUT precision structure
>-Original Message-
>From: Alexandru-Cosmin Gheorghe [mailto:Alexandru-
>cosmin.gheor...@arm.com]
>Sent: Tuesday, August 21, 2018 3:00 PM
>To: Shankar, Uma
>Cc: intel-...@lists.freedesktop.org; dri-devel@lists.freedesktop.org;
>dcasta...@chromium.org; emil.l.veli...@gmail.com; seanp...@chromium.org;
>Syrjala, Ville ; Lankhorst, Maarten
>; n...@arm.com
>Subject: Re: [RFC v4 1/8] drm: Add Enhanced Gamma LUT precision structure
>
>Hi Uma,
>
>On Fri, Aug 17, 2018 at 07:48:44PM +0530, Uma Shankar wrote:
>> Existing LUT precision structure is having only 16 bit precision. This
>> is not enough for upcoming enhanced hardwares and advance usecases
>> like HDR processing. Hence added a new structure with 32 bit precision
>> values. Also added the code, for extracting the same from values
>> passed from userspace.
>>
>> v4: Rebase
>>
>> Signed-off-by: Uma Shankar
>> ---
>> drivers/gpu/drm/drm_plane.c | 19 +++
>> include/uapi/drm/drm_mode.h | 15 +++
>> 2 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
>> index 6153cbd..cd71fd0 100644
>> --- a/drivers/gpu/drm/drm_plane.c
>> +++ b/drivers/gpu/drm/drm_plane.c
>> @@ -430,6 +430,25 @@ void drm_plane_force_disable(struct drm_plane
>> *plane) } EXPORT_SYMBOL(drm_plane_force_disable);
>>
>> +/*
>> + * Added to accommodate enhanced LUT precision.
>> + * Max LUT precision is 32 bits.
>> + */
>> +uint32_t drm_color_lut_extract_ext(uint32_t user_input, uint32_t
>> +bit_precision)
>
>You should declare this function in a header file as well.
Thanks Alexandru for the review. Sure, will fix that and resend.
>With that fixed
>Reviewed-by: Alexandru Gheorghe
>
>
>> +{
>> +uint32_t val = user_input;
>> +uint32_t max = 0x >> (32 - bit_precision);
>> +
>> +/* Round only if we're not using full precision. */
>> +if (bit_precision < 32) {
>> +val += 1UL << (32 - bit_precision - 1);
>> +val >>= 32 - bit_precision;
>> +}
>> +
>> +return clamp_val(val, 0, max);
>> +}
>> +EXPORT_SYMBOL(drm_color_lut_extract_ext);
>> +
>> /**
>> * drm_mode_plane_set_obj_prop - set the value of a property
>> * @plane: drm plane object to set property value for diff --git
>> a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index
>> 8d67243..874407b 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -629,6 +629,21 @@ struct drm_color_lut {
>> __u16 reserved;
>> };
>>
>> +/*
>> + * Creating 32 bit palette entries for better data
>> + * precision. This will be required for HDR and
>> + * similar color processing usecases.
>> + */
>> +struct drm_color_lut_ext {
>> +/*
>> + * Data is U0.32 fixed point format.
>> + */
>> +__u32 red;
>> +__u32 green;
>> +__u32 blue;
>> +__u32 reserved;
>> +};
>> +
>> #define DRM_MODE_PAGE_FLIP_EVENT 0x01 #define
>> DRM_MODE_PAGE_FLIP_ASYNC 0x02 #define
>> DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
>> --
>> 1.9.1
>>
>> ___
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>--
>Cheers,
>Alex G
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Re: [RFC v4 1/8] drm: Add Enhanced Gamma LUT precision structure
Hi Uma,
On Fri, Aug 17, 2018 at 07:48:44PM +0530, Uma Shankar wrote:
> Existing LUT precision structure is having only 16 bit
> precision. This is not enough for upcoming enhanced hardwares
> and advance usecases like HDR processing. Hence added a new
> structure with 32 bit precision values. Also added the code,
> for extracting the same from values passed from userspace.
>
> v4: Rebase
>
> Signed-off-by: Uma Shankar
> ---
> drivers/gpu/drm/drm_plane.c | 19 +++
> include/uapi/drm/drm_mode.h | 15 +++
> 2 files changed, 34 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 6153cbd..cd71fd0 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -430,6 +430,25 @@ void drm_plane_force_disable(struct drm_plane *plane)
> }
> EXPORT_SYMBOL(drm_plane_force_disable);
>
> +/*
> + * Added to accommodate enhanced LUT precision.
> + * Max LUT precision is 32 bits.
> + */
> +uint32_t drm_color_lut_extract_ext(uint32_t user_input, uint32_t
> bit_precision)
You should declare this function in a header file as well.
With that fixed
Reviewed-by: Alexandru Gheorghe
> +{
> + uint32_t val = user_input;
> + uint32_t max = 0x >> (32 - bit_precision);
> +
> + /* Round only if we're not using full precision. */
> + if (bit_precision < 32) {
> + val += 1UL << (32 - bit_precision - 1);
> + val >>= 32 - bit_precision;
> + }
> +
> + return clamp_val(val, 0, max);
> +}
> +EXPORT_SYMBOL(drm_color_lut_extract_ext);
> +
> /**
> * drm_mode_plane_set_obj_prop - set the value of a property
> * @plane: drm plane object to set property value for
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index 8d67243..874407b 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -629,6 +629,21 @@ struct drm_color_lut {
> __u16 reserved;
> };
>
> +/*
> + * Creating 32 bit palette entries for better data
> + * precision. This will be required for HDR and
> + * similar color processing usecases.
> + */
> +struct drm_color_lut_ext {
> + /*
> + * Data is U0.32 fixed point format.
> + */
> + __u32 red;
> + __u32 green;
> + __u32 blue;
> + __u32 reserved;
> +};
> +
> #define DRM_MODE_PAGE_FLIP_EVENT 0x01
> #define DRM_MODE_PAGE_FLIP_ASYNC 0x02
> #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
> --
> 1.9.1
>
> ___
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Cheers,
Alex G
___
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[RFC v4 1/8] drm: Add Enhanced Gamma LUT precision structure
Existing LUT precision structure is having only 16 bit
precision. This is not enough for upcoming enhanced hardwares
and advance usecases like HDR processing. Hence added a new
structure with 32 bit precision values. Also added the code,
for extracting the same from values passed from userspace.
v4: Rebase
Signed-off-by: Uma Shankar
---
drivers/gpu/drm/drm_plane.c | 19 +++
include/uapi/drm/drm_mode.h | 15 +++
2 files changed, 34 insertions(+)
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 6153cbd..cd71fd0 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -430,6 +430,25 @@ void drm_plane_force_disable(struct drm_plane *plane)
}
EXPORT_SYMBOL(drm_plane_force_disable);
+/*
+ * Added to accommodate enhanced LUT precision.
+ * Max LUT precision is 32 bits.
+ */
+uint32_t drm_color_lut_extract_ext(uint32_t user_input, uint32_t bit_precision)
+{
+ uint32_t val = user_input;
+ uint32_t max = 0x >> (32 - bit_precision);
+
+ /* Round only if we're not using full precision. */
+ if (bit_precision < 32) {
+ val += 1UL << (32 - bit_precision - 1);
+ val >>= 32 - bit_precision;
+ }
+
+ return clamp_val(val, 0, max);
+}
+EXPORT_SYMBOL(drm_color_lut_extract_ext);
+
/**
* drm_mode_plane_set_obj_prop - set the value of a property
* @plane: drm plane object to set property value for
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 8d67243..874407b 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -629,6 +629,21 @@ struct drm_color_lut {
__u16 reserved;
};
+/*
+ * Creating 32 bit palette entries for better data
+ * precision. This will be required for HDR and
+ * similar color processing usecases.
+ */
+struct drm_color_lut_ext {
+ /*
+* Data is U0.32 fixed point format.
+*/
+ __u32 red;
+ __u32 green;
+ __u32 blue;
+ __u32 reserved;
+};
+
#define DRM_MODE_PAGE_FLIP_EVENT 0x01
#define DRM_MODE_PAGE_FLIP_ASYNC 0x02
#define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
--
1.9.1
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