Re: [PATCH 01/10] fbdev: Add fb_ops init macros for framebuffers in DMA-able memory

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Hi Javier

Am 05.07.23 um 10:23 schrieb Javier Martinez Canillas:
Thomas Zimmermann <tzimmermann@xxxxxxx> writes:

Hello Thomas,

Add initializer macros for struct fb_ops for framebuffers in DMA-able
memory areas. Also add a corresponding Kconfig token. As of now, this
is equivalent to system framebuffers and mostly useful for labeling
drivers correctly.

A later patch may add a generic DMA-specific mmap operation. Linux
offers a number of dma_mmap_*() helpers for different use cases.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
---
  drivers/video/fbdev/Kconfig |  8 ++++++++
  include/linux/fb.h          | 13 +++++++++++++
  2 files changed, 21 insertions(+)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index cecf15418632..f14229757311 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -168,6 +168,14 @@ config FB_DEFERRED_IO
  	bool
  	depends on FB
+config FB_DMA_HELPERS
+	bool
+	depends on FB
+	select FB_SYS_COPYAREA
+	select FB_SYS_FILLRECT
+	select FB_SYS_FOPS
+	select FB_SYS_IMAGEBLIT
+
  config FB_IO_HELPERS
  	bool
  	depends on FB
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 1d5c13f34b09..1191a78c5289 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -594,6 +594,19 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
  	__FB_DEFAULT_SYS_OPS_DRAW, \
  	__FB_DEFAULT_SYS_OPS_MMAP
+/*
+ * Helpers for framebuffers in DMA-able memory
+ */
+

The comment for I/O memory helpers says:

/*
  * Initializes struct fb_ops for framebuffers in I/O memory.
  */

I think that would be good to have consistency between these two,

Sure, I had the same thought. I think I'll rather change the existing comments a bit.

Best regards
Thomas


so something like:

/*
  * Initializes struct fb_ops for framebuffers in DMA-able memory.
  */

+#define __FB_DEFAULT_DMA_OPS_RDWR \
+	.fb_read	= fb_sys_read, \
+	.fb_write	= fb_sys_write
+
+#define __FB_DEFAULT_DMA_OPS_DRAW \
+	.fb_fillrect	= sys_fillrect, \
+	.fb_copyarea	= sys_copyarea, \
+	.fb_imageblit	= sys_imageblit
+

Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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