Some devices have their own framebuffer memory that is not shared directly with the CPU. For said devices, we need to copy U-boot's framebuffer (priv->fb) to the device's own framebuffer memory. E.g., via SPI.
To support these devices, I've added the copy_fb_to_hw op. It's optional, so existing drivers do not need to define this op.
I've used this new op to add support for the SSD2119 display panel driver over 4-wire SPI. I'll add this video driver in a subsequent patch.
Signed-off-by: Frederik Aalund fpa@sbtinstruments.com Cc: agust@denx.de
--- drivers/video/video-uclass.c | 14 ++++++++++++++ include/video.h | 8 +++++++- 2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c index 12057c8a5b..6921f1ec2b 100644 --- a/drivers/video/video-uclass.c +++ b/drivers/video/video-uclass.c @@ -147,6 +147,8 @@ void video_set_default_colors(struct udevice *dev, bool invert) /* Flush video activity to the caches */ void video_sync(struct udevice *vid, bool force) { + int ret; + struct video_ops *ops = video_get_ops(vid); /* * flush_dcache_range() is declared in common.h but it seems that some * architectures do not actually implement it. Is there a way to find @@ -169,6 +171,18 @@ void video_sync(struct udevice *vid, bool force) last_sync = get_timer(0); } #endif + /* + * Some devices have their own framebuffer memory that is not + * shared directly with the CPU. For said devices, we need to + * copy U-boot's framebuffer (priv->fb) to the device's own + * framebuffer memory. E.g., via SPI. + */ + if (ops->copy_fb_to_hw) { + ret = ops->copy_fb_to_hw(vid); + if (ret) { + dev_err(vid, "Could not copy frame buffer to hardware: %d\n", ret); + } + } }
void video_sync_all(void) diff --git a/include/video.h b/include/video.h index 485071d072..a72807e3cb 100644 --- a/include/video.h +++ b/include/video.h @@ -96,8 +96,14 @@ struct video_priv { u8 bg_col_idx; };
-/* Placeholder - there are no video operations at present */ struct video_ops { + /** + * copy_fb_to_hw() - Copy the current frame buffer to the hardware + * + * @dev: Video device + * @return 0 if OK, -ve on error + */ + int (*copy_fb_to_hw)(struct udevice *dev); };
#define video_get_ops(dev) ((struct video_ops *)(dev)->driver->ops)