From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Javier Martinez Canillas <javierm@redhat.com>,
Sam Ravnborg <sam@ravnborg.org>, Helge Deller <deller@gmx.de>
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
linux-m68k@vger.kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH v2 01/10] drm/fourcc: Add drm_format_info_bpp() helper
Date: Mon, 7 Mar 2022 21:52:36 +0100 [thread overview]
Message-ID: <eab1fe866c0ffd4ac097e66ff48725dd39893105.1646683502.git.geert@linux-m68k.org> (raw)
In-Reply-To: <cover.1646683502.git.geert@linux-m68k.org>
Add a helper to retrieve the actual number of bits per pixel for a
plane, taking into account the number of characters and pixels per
block for tiled formats.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
v2:
- Move up.
---
drivers/gpu/drm/drm_fourcc.c | 19 +++++++++++++++++++
include/drm/drm_fourcc.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 07741b678798b0f1..cf48ea0b2cb70ba8 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -370,6 +370,25 @@ unsigned int drm_format_info_block_height(const struct drm_format_info *info,
}
EXPORT_SYMBOL(drm_format_info_block_height);
+/**
+ * drm_format_info_bpp - number of bits per pixel
+ * @info: pixel format info
+ * @plane: plane index
+ *
+ * Returns:
+ * The actual number of bits per pixel, depending on the plane index.
+ */
+unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane)
+{
+ if (!info || plane < 0 || plane >= info->num_planes)
+ return 0;
+
+ return info->char_per_block[plane] * 8 /
+ (drm_format_info_block_width(info, plane) *
+ drm_format_info_block_height(info, plane));
+}
+EXPORT_SYMBOL(drm_format_info_bpp);
+
/**
* drm_format_info_min_pitch - computes the minimum required pitch in bytes
* @info: pixel format info
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index 22aa64d07c7905e2..3800a7ad7f0cda7a 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -313,6 +313,7 @@ unsigned int drm_format_info_block_width(const struct drm_format_info *info,
int plane);
unsigned int drm_format_info_block_height(const struct drm_format_info *info,
int plane);
+unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane);
uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
int plane, unsigned int buffer_width);
--
2.25.1
next prev parent reply other threads:[~2022-03-07 20:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-07 20:52 [PATCH v2 00/10] drm: Add support for low-color frame buffer formats Geert Uytterhoeven
2022-03-07 20:52 ` Geert Uytterhoeven [this message]
2022-03-09 12:46 ` [PATCH v2 01/10] drm/fourcc: Add drm_format_info_bpp() helper Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 02/10] drm/fourcc: Add drm_format_info.is_color_indexed flag Geert Uytterhoeven
2022-03-09 12:50 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 03/10] drm/client: Use actual bpp when allocating frame buffers Geert Uytterhoeven
2022-03-09 12:51 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 04/10] drm/framebuffer: Use actual bpp for DRM_IOCTL_MODE_GETFB Geert Uytterhoeven
2022-03-09 12:53 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 05/10] drm/fourcc: Add DRM_FORMAT_C[124] Geert Uytterhoeven
2022-03-08 9:04 ` Pekka Paalanen
2022-03-09 12:57 ` Javier Martinez Canillas
2022-03-14 13:30 ` Geert Uytterhoeven
2022-03-14 15:05 ` Pekka Paalanen
2022-03-14 19:01 ` Geert Uytterhoeven
2022-03-14 22:15 ` Finn Thain
2022-03-15 7:32 ` Pekka Paalanen
2022-03-15 7:51 ` Geert Uytterhoeven
2022-03-15 7:52 ` Geert Uytterhoeven
2022-03-15 8:45 ` Pekka Paalanen
2022-03-15 8:57 ` Geert Uytterhoeven
2022-03-15 10:48 ` Pekka Paalanen
2022-03-07 20:52 ` [PATCH v2 06/10] drm/fb-helper: Add support for DRM_FORMAT_C[124] Geert Uytterhoeven
2022-03-09 13:10 ` Javier Martinez Canillas
2022-03-09 13:14 ` Geert Uytterhoeven
2022-03-07 20:52 ` [PATCH v2 RFC 07/10] drm/gem-fb-helper: Use actual bpp for size calculations Geert Uytterhoeven
2022-03-09 13:16 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 RFC 08/10] drm/fourcc: Document that single-channel "red" can be any color Geert Uytterhoeven
2022-03-08 9:06 ` Pekka Paalanen
2022-03-09 13:33 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 RFC 09/10] drm/fourcc: Add DRM_FORMAT_R[124] Geert Uytterhoeven
2022-03-09 13:39 ` Javier Martinez Canillas
2022-03-07 20:52 ` [PATCH v2 RFC 10/10] drm/fourcc: Add DRM_FORMAT_D[1248] Geert Uytterhoeven
2022-03-09 13:41 ` Javier Martinez Canillas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=eab1fe866c0ffd4ac097e66ff48725dd39893105.1646683502.git.geert@linux-m68k.org \
--to=geert@linux-m68k.org \
--cc=airlied@linux.ie \
--cc=daniel@ffwll.ch \
--cc=deller@gmx.de \
--cc=dri-devel@lists.freedesktop.org \
--cc=javierm@redhat.com \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mripard@kernel.org \
--cc=sam@ravnborg.org \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).