Den 12.03.2017 19.00, skrev Daniel Vetter:
On Sat, Mar 11, 2017 at 10:35:32PM +0100, Noralf Trønnes wrote:
Add tinydrm_rgb565_buf_copy() function that copies buffer rectangle to
destination buffer and also handles XRGB8888 and byte swap conversions.
Useful for displays that only support RGB565 and can do partial updates.
Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
---
drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 56 +++++++++++++++++++++++++-
include/drm/tinydrm/tinydrm-helpers.h | 2 +
2 files changed, 56 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index d4cda33..e639453 100644
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -7,13 +7,15 @@
* (at your option) any later version.
*/
-#include <drm/tinydrm/tinydrm.h>
-#include <drm/tinydrm/tinydrm-helpers.h>
#include <linux/backlight.h>
+#include <linux/dma-buf.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/swab.h>
+#include <drm/tinydrm/tinydrm.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+
static unsigned int spi_max;
module_param(spi_max, uint, 0400);
MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
@@ -181,6 +183,56 @@ void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
So I noticed that we already have the xrgb8888 to rgb565 function, so I'm
a bit late on this, but: DRM doesn't do format conversions, with the
single exception that the legacy cursor interface is specced to be
argb8888.
Imo this should be removed (and preferrably before we ship tinydrm in a
stable kernel). Why did you add it?
I added it from the start because plymouth can only do xrgb8888 and I
thought that this was probably the format that most apps/libs/tools
supported, ensuring that tinydrm would work with everything. But I was
aware that this was the kernel patching up userspace, so I knew that it
might be shot down.
But after your comment, I thought that this was in the clear:
https://lists.freedesktop.org/archives/dri-devel/2017-January/130551.html
> > +EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
>
> I wonder whether the above would make sense in drm core as some kind
of fb
> helpers. But we can do that once there's a clear need.
I can make a patch that removes this format conversion.
Noralf.
-Daniel
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