Merge tag 'drm-misc-next-2025-02-20' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

drm-misc-next for v6.15:

UAPI Changes:

device-wedged events:
- Let's drivers notify userspace of hung-up devices via uevent

Cross-subsystem Changes:

media:
- cec: tda998x: Import driver from DRM

Core Changes:

- Cleanups

atomic-helper:
- async-flip: Support on arbitrary planes
- writeback: Fix use-after-free error
- Document atomic-state history
- Pleanty of cleanups to callback parameter names

doc:
- Test for kernel-doc errors

format-helper:
- Support ARGB8888-to-ARGB4444 pixel-format conversion

panel-orientation-quirks:
- Add quirks for AYANEO 2S, AYA NEO Flip DS and KB, AYA NEO Slide, GPD Win 2,
  OneXPlayer Mini (Intel)

sched:
- Add parameter struct for init

Driver Changes:

amdgpu:
- Support device-wedged event
- Support async pageflips on overlay planes

amdxdna:
- Refactoring

ast:
- Refactor cursor handling

bridge:
- Pass full atomic state to various callbacks
- analogix-dp: Cleanups
- cdns-mhdp8546: Fix clock enable/disable
- nwl-dsi: Set bridge type
- panel: Cleanups
- ti-sn65dsi83: Add error recovery; Set bridge type

i2c:
- tda998x: Drop unused platform_data; Split driver into separate media and bridge drivers
- Remove the obsolete directory

i915:
- Support device-wedged event

nouveau:
- Fixes

panel:
- visionox-r66451: Use multi-style MIPI-DSI functions

v3d:
- Handle clock

vkms:
- Fix use-after-free error

xe:
- Support device-wedged event

xlnx:
- Use mutex guards
- Cleanups

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20250220085321.GA184551@linux.fritz.box

1 files changed, 69 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index b1be458ed4dd..ecb278b63e8c 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -978,6 +978,75 @@ void drm_fb_xrgb8888_to_gray8(struct iosys_map *dst, const unsigned int *dst_pit
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
 
+static void drm_fb_argb8888_to_argb4444_line(void *dbuf, const void *sbuf, unsigned int pixels)
+{
+	unsigned int pixels2 = pixels & ~GENMASK_ULL(0, 0);
+	__le32 *dbuf32 = dbuf;
+	__le16 *dbuf16 = dbuf + pixels2 * sizeof(*dbuf16);
+	const __le32 *sbuf32 = sbuf;
+	unsigned int x;
+	u32 val32;
+	u16 val16;
+	u32 pix[2];
+
+	for (x = 0; x < pixels2; x += 2, ++dbuf32) {
+		pix[0] = le32_to_cpu(sbuf32[x]);
+		pix[1] = le32_to_cpu(sbuf32[x + 1]);
+		val32 = ((pix[0] & 0xf0000000) >> 16) |
+			((pix[0] & 0x00f00000) >> 12) |
+			((pix[0] & 0x0000f000) >> 8) |
+			((pix[0] & 0x000000f0) >> 4) |
+			((pix[1] & 0xf0000000) >> 0) |
+			((pix[1] & 0x00f00000) << 4) |
+			((pix[1] & 0x0000f000) << 8) |
+			((pix[1] & 0x000000f0) << 12);
+		*dbuf32 = cpu_to_le32(val32);
+	}
+	for (; x < pixels; x++) {
+		pix[0] = le32_to_cpu(sbuf32[x]);
+		val16 = ((pix[0] & 0xf0000000) >> 16) |
+			((pix[0] & 0x00f00000) >> 12) |
+			((pix[0] & 0x0000f000) >> 8) |
+			((pix[0] & 0x000000f0) >> 4);
+		dbuf16[x] = cpu_to_le16(val16);
+	}
+}
+
+/**
+ * drm_fb_argb8888_to_argb4444 - Convert ARGB8888 to ARGB4444 clip buffer
+ * @dst: Array of ARGB4444 destination buffers
+ * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
+ *             within @dst; can be NULL if scanlines are stored next to each other.
+ * @src: Array of ARGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @state: Transform and conversion state
+ *
+ * This function copies parts of a framebuffer to display memory and converts
+ * the color format during the process. The parameters @dst, @dst_pitch and
+ * @src refer to arrays. Each array must have at least as many entries as
+ * there are planes in @fb's format. Each entry stores the value for the
+ * format's respective color plane at the same index.
+ *
+ * This function does not apply clipping on @dst (i.e. the destination is at the
+ * top-left corner).
+ *
+ * Drivers can use this function for ARGB4444 devices that don't support
+ * ARGB8888 natively.
+ */
+void drm_fb_argb8888_to_argb4444(struct iosys_map *dst, const unsigned int *dst_pitch,
+				 const struct iosys_map *src, const struct drm_framebuffer *fb,
+				 const struct drm_rect *clip, struct drm_format_conv_state *state)
+{
+	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
+		2,
+	};
+
+	drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
+		    drm_fb_argb8888_to_argb4444_line);
+}
+EXPORT_SYMBOL(drm_fb_argb8888_to_argb4444);
+
 /**
  * drm_fb_blit - Copy parts of a framebuffer to display memory
  * @dst:	Array of display-memory addresses to copy to