Re: [PATCH 28/33] fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with direct calls

Daniel Thompson
2019-06-11T14:11:00Z

On Tue, May 28, 2019 at 11:02:59AM +0200, Daniel Vetter wrote:
> Create a new wrapper function for this, feels like there's some
> refactoring room here between the two modes.
>
> v2: backlight notifier is also interested in the mode change event,
> it calls lcd->set_mode, of which there are 3 implementations. Thanks
> to Maarten for spotting this. So we keep that. We can ditch the differentiation
> between mode change and all mode changes (because backlight notifier
> doesn't care), and we can drop the FBINFO_MISC_USEREVENT stuff too,
> because that's just to prevent recursion between fbmem.c and fbcon.c.
>
> While at it flatten the control flow a bit.
>
> v3: Need to add a static inline to the dummy function.
>
> v4: Add missing #include <fbcon.h> to sh_mob (Sam).
>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Yisheng Xie <ysxie@foxmail.com>
> Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
> Cc: Peter Rosin <peda@axentia.se>
> Cc: Mikulas Patocka <mpatocka@redhat.com>
> Cc: linux-fbdev@vger.kernel.org

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>

> ---
> drivers/video/backlight/lcd.c | 1 -
> drivers/video/fbdev/core/fbcon.c | 15 +++++++++------
> drivers/video/fbdev/core/fbmem.c | 21 ++++++++++-----------
> drivers/video/fbdev/sh_mobile_lcdcfb.c | 12 ++----------
> include/linux/fb.h | 2 --
> include/linux/fbcon.h | 2 ++
> 6 files changed, 23 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
> index 151b18776add..ecdda06989d0 100644
> --- a/drivers/video/backlight/lcd.c
> +++ b/drivers/video/backlight/lcd.c
> @@ -34,7 +34,6 @@ static int fb_notifier_callback(struct notifier_block *self,
> 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;
> diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
> index b5ee89f16d6c..e98551f96138 100644
> --- a/drivers/video/fbdev/core/fbcon.c
> +++ b/drivers/video/fbdev/core/fbcon.c
> @@ -3009,6 +3009,15 @@ 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)
> {
> @@ -3318,12 +3327,6 @@ 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 96805fe85332..dd1a708df1a7 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -957,6 +957,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
> u32 activate;
> struct fb_var_screeninfo old_var;
> struct fb_videomode mode;
> + struct fb_event event;
>
> if (var->activate & FB_ACTIVATE_INV_MODE) {
> struct fb_videomode mode1, mode2;
> @@ -1039,19 +1040,17 @@ 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;
> + if (ret)
> + return ret;
>
> - info->flags &= ~FBINFO_MISC_USEREVENT;
> - event.info = info;
> - event.data = &mode;
> - fb_notifier_call_chain(evnt, &event);
> - }
> + event.info = info;
> + event.data = &mode;
> + fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event);
>
> - return ret;
> + if (flags & FBINFO_MISC_USEREVENT)
> + fbcon_update_vcs(info, activate & FB_ACTIVATE_ALL);
> +
> + return 0;
> }
> EXPORT_SYMBOL(fb_set_var);
>
> diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> index 015a02a29d37..b8454424910d 100644
> --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> @@ -15,6 +15,7 @@
> #include <linux/ctype.h>
> #include <linux/dma-mapping.h>
> #include <linux/delay.h>
> +#include <linux/fbcon.h>
> #include <linux/gpio.h>
> #include <linux/init.h>
> #include <linux/interrupt.h>
> @@ -1757,8 +1758,6 @@ 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 */
> @@ -1780,14 +1779,7 @@ 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 1e66fac3124f..f9c212f9b661 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -139,8 +139,6 @@ struct fb_cursor_user {
> #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 d67d7ec51ef9..de31eeb22c97 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 @@ static inline void fbcon_new_modelist(struct fb_info *info) {}
> static inline void fbcon_get_requirement(struct fb_info *info,
> struct fb_blit_caps *caps) {}
> static inline void fbcon_fb_blanked(struct fb_info *info, int blank) {}
> +static inline void fbcon_update_vcs(struct fb_info *info, bool all) {}
> #endif
>
> #endif /* _LINUX_FBCON_H */
> --
> 2.20.1
>
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