| Message ID | 20210501200050.410704-1-sebastian.reichel@collabora.com |
|---|---|
| State | New |
| Headers | show |
| Series | [PATCHv1] drm/omap: get fbdev working for manually updated display | expand |
On 01/05/2021 23:00, Sebastian Reichel wrote: > Running a legacy application, which directly uses /dev/fb0 > currently results in display not being refreshed when the > application mmaps the memory instead of calling write(). > > Deferred IO support will also schedule dirty_work with the > damage collected from the mmap page writes and thus gets > some more legacy applications working. > > Delay frequency settings have been taken over from > drm_fb_helper_generic_probe(). > > Reported-by: Carl Philipp Klemm <philipp@uvos.xyz> > Tested-by: Carl Philipp Klemm <philipp@uvos.xyz> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> > --- > Hi, > > I still need to fix my Droid 4, so I only compile tested this > myself. > > -- Sebastian > --- > drivers/gpu/drm/omapdrm/omap_fbdev.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c > index 42eac6ad12bd..fc3897d2d7cc 100644 > --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c > +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c > @@ -87,6 +87,11 @@ static const struct fb_ops omap_fb_ops = { > .fb_imageblit = drm_fb_helper_sys_imageblit, > }; > > +static struct fb_deferred_io omap_fb_defio = { > + .delay = HZ / 20, > + .deferred_io = drm_fb_helper_deferred_io, > +}; > + > static int omap_fbdev_create(struct drm_fb_helper *helper, > struct drm_fb_helper_surface_size *sizes) > { > @@ -176,6 +181,9 @@ static int omap_fbdev_create(struct drm_fb_helper *helper, > > drm_fb_helper_fill_info(fbi, helper, sizes); > > + fbi->fbdefio = &omap_fb_defio; > + fb_deferred_io_init(fbi); > + > dev->mode_config.fb_base = dma_addr; > > fbi->screen_buffer = omap_gem_vaddr(fbdev->bo); > > base-commit: 152d32aa846835987966fd20ee1143b0e05036a0 > On DRA76 EVM, with parallel output, this causes cache-flush problem. When I run my simple fbtest, which just draws to the fb, I see lots of cache-line artifacts. When I run kmstest (from kms++), I get a flood of list corruptions somewhere in omap_gem. Is it related to "Deferred I/O is not compatible with SHMEM"? Tomi
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c index 42eac6ad12bd..fc3897d2d7cc 100644 --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c @@ -87,6 +87,11 @@ static const struct fb_ops omap_fb_ops = { .fb_imageblit = drm_fb_helper_sys_imageblit, }; +static struct fb_deferred_io omap_fb_defio = { + .delay = HZ / 20, + .deferred_io = drm_fb_helper_deferred_io, +}; + static int omap_fbdev_create(struct drm_fb_helper *helper, struct drm_fb_helper_surface_size *sizes) { @@ -176,6 +181,9 @@ static int omap_fbdev_create(struct drm_fb_helper *helper, drm_fb_helper_fill_info(fbi, helper, sizes); + fbi->fbdefio = &omap_fb_defio; + fb_deferred_io_init(fbi); + dev->mode_config.fb_base = dma_addr; fbi->screen_buffer = omap_gem_vaddr(fbdev->bo);