From: Thomas Zimmermann <tzimmermann@suse.de>
To: javierm@redhat.com, airlied@linux.ie, daniel@ffwll.ch,
deller@gmx.de, maxime@cerno.tech, sam@ravnborg.org,
msuchanek@suse.de, mpe@ellerman.id.au, benh@kernel.crashing.org,
paulus@samba.org, geert@linux-m68k.org,
mark.cave-ayland@ilande.co.uk
Cc: linux-fbdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
Thomas Zimmermann <tzimmermann@suse.de>,
dri-devel@lists.freedesktop.org
Subject: [PATCH v4 5/5] drm/ofdrm: Support big-endian scanout buffers
Date: Wed, 28 Sep 2022 12:50:10 +0200 [thread overview]
Message-ID: <20220928105010.18880-6-tzimmermann@suse.de> (raw)
In-Reply-To: <20220928105010.18880-1-tzimmermann@suse.de>
All DRM formats assume little-endian byte order. On big-endian systems,
it is likely that the scanout buffer is in big endian as well. Update
the format accordingly and add endianess conversion to the format-helper
library. Also opt-in to allocated buffers in host format by default.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/drm_format_helper.c | 10 ++++++
drivers/gpu/drm/tiny/ofdrm.c | 55 +++++++++++++++++++++++++++--
2 files changed, 63 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 4afc4ac27342..fca7936db083 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -659,6 +659,11 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, src, fb, clip, false);
return 0;
}
+ } else if (dst_format == (DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN)) {
+ if (fb_format == DRM_FORMAT_RGB565) {
+ drm_fb_swab(dst, dst_pitch, src, fb, clip, false);
+ return 0;
+ }
} else if (dst_format == DRM_FORMAT_RGB888) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip);
@@ -677,6 +682,11 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip);
return 0;
}
+ } else if (dst_format == DRM_FORMAT_BGRX8888) {
+ if (fb_format == DRM_FORMAT_XRGB8888) {
+ drm_fb_swab(dst, dst_pitch, src, fb, clip, false);
+ return 0;
+ }
}
drm_warn_once(fb->dev, "No conversion helper from %p4cc to %p4cc found.\n",
diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index 0bf5eebf6678..6e100a7f5db7 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -94,7 +94,7 @@ static int display_get_validated_int0(struct drm_device *dev, const char *name,
}
static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
- u32 depth)
+ u32 depth, bool big_endian)
{
const struct drm_format_info *info;
u32 format;
@@ -115,6 +115,29 @@ static const struct drm_format_info *display_get_validated_format(struct drm_dev
return ERR_PTR(-EINVAL);
}
+ /*
+ * DRM formats assume little-endian byte order. Update the format
+ * if the scanout buffer uses big-endian ordering.
+ */
+ if (big_endian) {
+ switch (format) {
+ case DRM_FORMAT_XRGB8888:
+ format = DRM_FORMAT_BGRX8888;
+ break;
+ case DRM_FORMAT_ARGB8888:
+ format = DRM_FORMAT_BGRA8888;
+ break;
+ case DRM_FORMAT_RGB565:
+ format = DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN;
+ break;
+ case DRM_FORMAT_XRGB1555:
+ format = DRM_FORMAT_XRGB1555 | DRM_FORMAT_BIG_ENDIAN;
+ break;
+ default:
+ break;
+ }
+ }
+
info = drm_format_info(format);
if (!info) {
drm_err(dev, "cannot find framebuffer format for depth %u\n", depth);
@@ -134,6 +157,23 @@ static int display_read_u32_of(struct drm_device *dev, struct device_node *of_no
return ret;
}
+static bool display_get_big_endian_of(struct drm_device *dev, struct device_node *of_node)
+{
+ bool big_endian;
+
+#ifdef __BIG_ENDIAN
+ big_endian = true;
+ if (of_get_property(of_node, "little-endian", NULL))
+ big_endian = false;
+#else
+ big_endian = false;
+ if (of_get_property(of_node, "big-endian", NULL))
+ big_endian = true;
+#endif
+
+ return big_endian;
+}
+
static int display_get_width_of(struct drm_device *dev, struct device_node *of_node)
{
u32 width;
@@ -613,6 +653,7 @@ static void ofdrm_device_set_gamma_linear(struct ofdrm_device *odev,
switch (format->format) {
case DRM_FORMAT_RGB565:
+ case DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN:
/* Use better interpolation, to take 32 values from 0 to 255 */
for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
unsigned char r = i * 8 + i / 4;
@@ -631,6 +672,7 @@ static void ofdrm_device_set_gamma_linear(struct ofdrm_device *odev,
}
break;
case DRM_FORMAT_XRGB8888:
+ case DRM_FORMAT_BGRX8888:
for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++)
odev->funcs->cmap_write(odev, i, i, i, i);
break;
@@ -650,6 +692,7 @@ static void ofdrm_device_set_gamma(struct ofdrm_device *odev,
switch (format->format) {
case DRM_FORMAT_RGB565:
+ case DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN:
/* Use better interpolation, to take 32 values from lut[0] to lut[255] */
for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
unsigned char r = lut[i * 8 + i / 4].red >> 8;
@@ -668,6 +711,7 @@ static void ofdrm_device_set_gamma(struct ofdrm_device *odev,
}
break;
case DRM_FORMAT_XRGB8888:
+ case DRM_FORMAT_BGRX8888:
for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++) {
unsigned char r = lut[i].red >> 8;
unsigned char g = lut[i].green >> 8;
@@ -718,6 +762,9 @@ static const uint32_t ofdrm_primary_plane_formats[] = {
DRM_FORMAT_RGB565,
//DRM_FORMAT_XRGB1555,
//DRM_FORMAT_C8,
+ /* Big-endian formats below */
+ DRM_FORMAT_BGRX8888,
+ DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN,
};
static const uint64_t ofdrm_primary_plane_format_modifiers[] = {
@@ -1048,6 +1095,7 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
struct ofdrm_device *odev;
struct drm_device *dev;
enum ofdrm_model model;
+ bool big_endian;
int width, height, depth, linebytes;
const struct drm_format_info *format;
u64 address;
@@ -1109,6 +1157,8 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
break;
}
+ big_endian = display_get_big_endian_of(dev, of_node);
+
width = display_get_width_of(dev, of_node);
if (width < 0)
return ERR_PTR(width);
@@ -1122,7 +1172,7 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
if (linebytes < 0)
return ERR_PTR(linebytes);
- format = display_get_validated_format(dev, depth);
+ format = display_get_validated_format(dev, depth, big_endian);
if (IS_ERR(format))
return ERR_CAST(format);
if (!linebytes) {
@@ -1234,6 +1284,7 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
dev->mode_config.preferred_depth = depth;
break;
}
+ dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
/* Primary plane */
--
2.37.3
next prev parent reply other threads:[~2022-09-28 10:53 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 10:50 [PATCH v4 0/5] drm: Add driver for PowerPC OF displays Thomas Zimmermann
2022-09-28 10:50 ` [PATCH v4 1/5] drm/ofdrm: Add ofdrm for Open Firmware framebuffers Thomas Zimmermann
2022-09-28 10:50 ` [PATCH v4 2/5] drm/ofdrm: Add CRTC state Thomas Zimmermann
2022-09-28 10:50 ` [PATCH v4 3/5] drm/ofdrm: Add per-model device function Thomas Zimmermann
2022-09-28 10:50 ` [PATCH v4 4/5] drm/ofdrm: Support color management Thomas Zimmermann
2022-09-28 10:50 ` Thomas Zimmermann [this message]
2022-09-28 11:12 ` [PATCH v4 5/5] drm/ofdrm: Support big-endian scanout buffers Michal Suchánek
2022-09-28 11:30 ` Thomas Zimmermann
2022-10-11 7:46 ` Javier Martinez Canillas
2022-10-11 11:30 ` Thomas Zimmermann
2022-10-11 20:06 ` Arnd Bergmann
2022-10-11 21:38 ` Michal Suchánek
2022-10-12 6:29 ` Arnd Bergmann
2022-10-12 7:23 ` Michal Suchánek
2022-10-12 6:46 ` Thomas Zimmermann
2022-10-12 7:17 ` Arnd Bergmann
2022-10-12 7:40 ` Thomas Zimmermann
2022-10-12 7:44 ` Arnd Bergmann
2022-10-12 8:27 ` Thomas Zimmermann
2022-10-12 8:38 ` Arnd Bergmann
2022-10-12 12:00 ` Thomas Zimmermann
2022-10-12 13:12 ` Arnd Bergmann
2022-10-12 14:27 ` Michal Suchánek
2022-10-13 7:39 ` Javier Martinez Canillas
2022-10-17 6:44 ` Benjamin Herrenschmidt
2022-10-12 14:31 ` Thomas Zimmermann
2022-10-12 14:59 ` Ville Syrjälä
2022-10-12 16:01 ` Michal Suchánek
2022-10-12 12:07 ` Michal Suchánek
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