by Daniel Vetter

[permalink] [raw]

Subject: Re: [PATCH 29/33] fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls

On Tue, May 21, 2019 at 12:56:30PM +0200, Maarten Lankhorst wrote:
> Op 20-05-2019 om 10:22 schreef Daniel Vetter:
> > Create a new wrapper function for this, feels like there's some
> > refactoring room here between the two modes.
> >
> > Signed-off-by: Daniel Vetter <[email protected]>
> > Cc: Lee Jones <[email protected]>
> > Cc: Daniel Thompson <[email protected]>
> > Cc: Jingoo Han <[email protected]>
> > Cc: Bartlomiej Zolnierkiewicz <[email protected]>
> > Cc: Daniel Vetter <[email protected]>
> > Cc: Hans de Goede <[email protected]>
> > Cc: Yisheng Xie <[email protected]>
> > Cc: "Michał Mirosław" <[email protected]>
> > Cc: Peter Rosin <[email protected]>
> > Cc: Mikulas Patocka <[email protected]>
> > Cc: [email protected]
> > ---
> > drivers/video/backlight/lcd.c | 2 --
> > drivers/video/fbdev/core/fbcon.c | 15 +++++++++------
> > drivers/video/fbdev/core/fbmem.c | 13 ++-----------
> > drivers/video/fbdev/sh_mobile_lcdcfb.c | 11 +----------
> > include/linux/fb.h | 4 ----
> > include/linux/fbcon.h | 2 ++
> > 6 files changed, 14 insertions(+), 33 deletions(-)
> >
> > diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
> > index 4b40c6a4d441..16298041b141 100644
> > --- a/drivers/video/backlight/lcd.c
> > +++ b/drivers/video/backlight/lcd.c
> > @@ -32,8 +32,6 @@ static int fb_notifier_callback(struct notifier_block *self,
> > /* If we aren't interested in this event, skip it immediately ... */
> > switch (event) {
> > case FB_EVENT_BLANK:
> > - case FB_EVENT_MODE_CHANGE:
> > - case FB_EVENT_MODE_CHANGE_ALL:
> > case FB_EARLY_EVENT_BLANK:
> > case FB_R_EARLY_EVENT_BLANK:
> > break;
>
> Below it performs a call to set_mode() if it's none of the blanking events; it can be removed. :)

Oops ... I think I'll insert a patch here to create a new MODESET event
for backlights. We still need this one I think (maybe not for kms, but for
old fbdev drivers). And maybe a wrapper for fb_backlight_notify on top ...

Thanks for spotting this.
-Daniel

>
> > diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> > index c1a7476e980f..8cc62d340387 100644
> > --- a/drivers/video/fbdev/core/fbcon.c
> > +++ b/drivers/video/fbdev/core/fbcon.c
> > @@ -3005,6 +3005,15 @@ static void fbcon_set_all_vcs(struct fb_info *info)
> > fbcon_modechanged(info);
> > }
> >
> > +
> > +void fbcon_update_vcs(struct fb_info *info, bool all)
> > +{
> > + if (all)
> > + fbcon_set_all_vcs(info);
> > + else
> > + fbcon_modechanged(info);
> > +}
> > +
> > int fbcon_mode_deleted(struct fb_info *info,
> > struct fb_videomode *mode)
> > {
> > @@ -3314,12 +3323,6 @@ static int fbcon_event_notify(struct notifier_block *self,
> > int idx, ret = 0;
> >
> > switch(action) {
> > - case FB_EVENT_MODE_CHANGE:
> > - fbcon_modechanged(info);
> > - break;
> > - case FB_EVENT_MODE_CHANGE_ALL:
> > - fbcon_set_all_vcs(info);
> > - break;
> > case FB_EVENT_SET_CONSOLE_MAP:
> > /* called with console lock held */
> > con2fb = event->data;
> > diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> > index cbd58ba8a59d..55b88163edc2 100644
> > --- a/drivers/video/fbdev/core/fbmem.c
> > +++ b/drivers/video/fbdev/core/fbmem.c
> > @@ -1039,17 +1039,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
> > !list_empty(&info->modelist))
> > ret = fb_add_videomode(&mode, &info->modelist);
> >
> > - if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
> > - struct fb_event event;
> > - int evnt = (activate & FB_ACTIVATE_ALL) ?
> > - FB_EVENT_MODE_CHANGE_ALL :
> > - FB_EVENT_MODE_CHANGE;
> > -
> > - info->flags &= ~FBINFO_MISC_USEREVENT;
> > - event.info = info;
> > - event.data = &mode;
> > - fb_notifier_call_chain(evnt, &event);
> > - }
> > + if (!ret && (flags & FBINFO_MISC_USEREVENT))
> > + fbcon_update_vcs(info, activate & FB_ACTIVATE_ALL);
> >
> > return ret;
> > }
> > diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > index 0d7a044852d7..bb1a610d0363 100644
> > --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > @@ -1776,8 +1776,6 @@ static void sh_mobile_fb_reconfig(struct fb_info *info)
> > struct sh_mobile_lcdc_chan *ch = info->par;
> > struct fb_var_screeninfo var;
> > struct fb_videomode mode;
> > - struct fb_event event;
> > - int evnt = FB_EVENT_MODE_CHANGE_ALL;
> >
> > if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
> > /* More framebuffer users are active */
> > @@ -1799,14 +1797,7 @@ static void sh_mobile_fb_reconfig(struct fb_info *info)
> > /* Couldn't reconfigure, hopefully, can continue as before */
> > return;
> >
> > - /*
> > - * fb_set_var() calls the notifier change internally, only if
> > - * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
> > - * user event, we have to call the chain ourselves.
> > - */
> > - event.info = info;
> > - event.data = &ch->display.mode;
> > - fb_notifier_call_chain(evnt, &event);
> > + fbcon_update_vcs(info, true);
> > }
> >
> > /*
> > diff --git a/include/linux/fb.h b/include/linux/fb.h
> > index 4b9b882f8f52..54d6bee09121 100644
> > --- a/include/linux/fb.h
> > +++ b/include/linux/fb.h
> > @@ -124,16 +124,12 @@ struct fb_cursor_user {
> > * Register/unregister for framebuffer events
> > */
> >
> > -/* The resolution of the passed in fb_info about to change */
> > -#define FB_EVENT_MODE_CHANGE 0x01
> > /* CONSOLE-SPECIFIC: get console to framebuffer mapping */
> > #define FB_EVENT_GET_CONSOLE_MAP 0x07
> > /* CONSOLE-SPECIFIC: set console to framebuffer mapping */
> > #define FB_EVENT_SET_CONSOLE_MAP 0x08
> > /* A display blank is requested */
> > #define FB_EVENT_BLANK 0x09
> > -/* Private modelist is to be replaced */
> > -#define FB_EVENT_MODE_CHANGE_ALL 0x0B
> > /* CONSOLE-SPECIFIC: remap all consoles to new fb - for vga_switcheroo */
> > #define FB_EVENT_REMAP_ALL_CONSOLE 0x0F
> > /* A hardware display blank early change occurred */
> > diff --git a/include/linux/fbcon.h b/include/linux/fbcon.h
> > index 90e196c835dd..daaa97b0c9e6 100644
> > --- a/include/linux/fbcon.h
> > +++ b/include/linux/fbcon.h
> > @@ -15,6 +15,7 @@ void fbcon_new_modelist(struct fb_info *info);
> > void fbcon_get_requirement(struct fb_info *info,
> > struct fb_blit_caps *caps);
> > void fbcon_fb_blanked(struct fb_info *info, int blank);
> > +void fbcon_update_vcs(struct fb_info *info, bool all);
> > #else
> > static inline void fb_console_init(void) {}
> > static inline void fb_console_exit(void) {}
> > @@ -29,6 +30,7 @@ void fbcon_new_modelist(struct fb_info *info) {}
> > void fbcon_get_requirement(struct fb_info *info,
> > struct fb_blit_caps *caps) {}
> > void fbcon_fb_blanked(struct fb_info *info, int blank) {}
> > +void fbcon_update_vcs(struct fb_info *info, bool all) {}
> > #endif
> >
> > #endif /* _LINUX_FBCON_H */
>
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch