On 07/13/2015 01:01 PM, Daniel Vetter wrote:
On Mon, Jul 13, 2015 at 12:07:59PM +0530, Archit Taneja wrote:
Some drm drivers populate their fb_ops with fb_sys_read/write fb sysfs ops.
Create a drm_fb_helper function that wraps around these calls.
This is part of an effort to prevent drm drivers from calling fbdev functions directly, in order to make fbdev emulation a top level drm option.
Signed-off-by: Archit Taneja architt@codeaurora.org
drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/drm_fb_helper.c | 20 ++++++++++++++++++++ include/drm/drm_fb_helper.h | 5 +++++ 3 files changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index a66ac44..b284cdc 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -37,6 +37,7 @@ config DRM_KMS_FB_HELPER select FB select FRAMEBUFFER_CONSOLE if !EXPERT select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
- select FB_SYS_FOPS help FBDEV helpers for KMS drivers.
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 742377d..795547e 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -744,6 +744,26 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) } EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
+ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos)+{
- if (info)
I think this check here can never fail (if there's no fbdev you can't call this function), I don't think we need it. Even for drivers which call this themselves (like qxl/udl) they only call it from fbdev code.
That's a good point. I'll remove the 'if (info)' check.
qxl/udl don't seem to call the fb sysfs funcs. So I think it's okay.
Archit