From: Daniel Vetter <daniel@ffwll.ch>
To: Matteo Franchin <matteo.franchin@arm.com>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
Dave Airlie <airlied@linux.ie>,
Brian Starkey <brian.starkey@arm.com>,
Liviu Dudau <liviu.dudau@arm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
nd <nd@arm.com>
Subject: Re: [PATCH] drm/fourcc: Add AXBXGXRX106106106106 format
Date: Wed, 7 Oct 2020 12:06:34 +0200 [thread overview]
Message-ID: <CAKMK7uHZs7uKMbbQhn43-u7Y3_KANA6tU25jnOZkzj3h_7dmgg@mail.gmail.com> (raw)
In-Reply-To: <20201007092725.13300-1-matteo.franchin@arm.com>
On Wed, Oct 7, 2020 at 11:29 AM Matteo Franchin <matteo.franchin@arm.com> wrote:
>
> Add ABGR format with 10-bit components packed in 64-bit per pixel.
> This format can be used to handle
> VK_FORMAT_R10X6G10X6B10X6A10X6_UNORM_4PACK16 on little-endian
> architectures.
>
> Signed-off-by: Matteo Franchin <matteo.franchin@arm.com>
So is this essentially 16 bit, with the lowest 6 bits in each channel
ignored? What exactly is this used for where the full 16bit format
doesn't work?
-Daniel
> ---
> drivers/gpu/drm/drm_fourcc.c | 1 +
> include/uapi/drm/drm_fourcc.h | 7 +++++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 722c7ebe4e88..bba03fcb016d 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -202,6 +202,7 @@ const struct drm_format_info *__drm_format_info(u32 format)
> { .format = DRM_FORMAT_XBGR16161616F, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1 },
> { .format = DRM_FORMAT_ARGB16161616F, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> { .format = DRM_FORMAT_ABGR16161616F, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> + { .format = DRM_FORMAT_AXBXGXRX106106106106, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> { .format = DRM_FORMAT_RGB888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> { .format = DRM_FORMAT_BGR888_A8, .depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> { .format = DRM_FORMAT_XRGB8888_A8, .depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 82f327801267..76eedba52b77 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -155,6 +155,13 @@ extern "C" {
> #define DRM_FORMAT_ARGB16161616F fourcc_code('A', 'R', '4', 'H') /* [63:0] A:R:G:B 16:16:16:16 little endian */
> #define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H') /* [63:0] A:B:G:R 16:16:16:16 little endian */
>
> +/*
> + * RGBA format with 10-bit components packed in 64-bit per pixel, with 6 bits
> + * of unused padding per component:
> + * [63:0] A:x:B:x:G:x:R:x 10:6:10:6:10:6:10:6 little endian
> + */
> +#define DRM_FORMAT_AXBXGXRX106106106106 fourcc_code('A', 'B', '1', '0')
> +
> /* packed YCbCr */
> #define DRM_FORMAT_YUYV fourcc_code('Y', 'U', 'Y', 'V') /* [31:0] Cr0:Y1:Cb0:Y0 8:8:8:8 little endian */
> #define DRM_FORMAT_YVYU fourcc_code('Y', 'V', 'Y', 'U') /* [31:0] Cb0:Y1:Cr0:Y0 8:8:8:8 little endian */
> --
> 2.17.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2020-10-07 10:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 9:27 [PATCH] drm/fourcc: Add AXBXGXRX106106106106 format Matteo Franchin
2020-10-07 10:06 ` Daniel Vetter [this message]
2020-10-07 11:03 ` Matteo Franchin
2020-10-07 10:35 ` Ville Syrjälä
2020-10-07 11:07 ` Matteo Franchin
2020-10-07 22:47 ` Joe Perches
2020-10-08 8:57 ` Matteo Franchin
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