Hi Thomas,
On Fri, Apr 28, 2023 at 11:27:11AM +0200, Thomas Zimmermann wrote:
Implement framebuffer I/O helpers, such as fb_read*() and fb_write*()
with Linux' regular I/O functions. Remove all ifdef cases for the
various architectures.
Most of the supported architectures use __raw_() I/O functions or treat
framebuffer memory like regular memory. This is also implemented by the
architectures' I/O function, so we can use them instead.
Sparc uses SBus to connect to framebuffer devices. It provides respective
implementations of the framebuffer I/O helpers. The involved sbus_()
I/O helpers map to the same code as Sparc's regular I/O functions. As
with other platforms, we can use those instead.
We leave a TODO item to replace all fb_() functions with their regular
I/O counterparts throughout the fbdev drivers.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
include/linux/fb.h | 63 +++++++++++-----------------------------------
1 file changed, 15 insertions(+), 48 deletions(-)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 08cb47da71f8..4aa9e90edd17 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -15,7 +15,6 @@
#include <linux/list.h>
#include <linux/backlight.h>
#include <linux/slab.h>
-#include <asm/io.h>
struct vm_area_struct;
struct fb_info;
@@ -511,58 +510,26 @@ struct fb_info {
*/
#define STUPID_ACCELF_TEXT_SHIT
-// This will go away
-#if defined(__sparc__)
-
-/* We map all of our framebuffers such that big-endian accesses
- * are what we want, so the following is sufficient.
+/*
+ * TODO: Update fbdev drivers to call the I/O helpers directly and
+ * remove the fb_() tokens.
*/
When the __raw_* variants are used, as Geert points out, then I think
the memcpy / memset can be replaced, but the rest seems fine to keep.
My personal opinion is that __raw_* is for macro use etc, and not
something to use everywhere. So I like the fb_read/fb_write macros.
But that is just my color of the bikeshed.
Sam
