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Date:   Tue, 21 May 2019 14:42:59 +0200
From:   Daniel Vetter <daniel@ffwll.ch>
To:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc:     Daniel Vetter <daniel.vetter@ffwll.ch>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        =?utf-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= <mirq-linux@rere.qmqm.pl>,
        Yisheng Xie <ysxie@foxmail.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mikulas Patocka <mpatocka@redhat.com>,
        linux-fbdev@vger.kernel.org, Jingoo Han <jingoohan1@gmail.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Lee Jones <lee.jones@linaro.org>, Peter Rosin <peda@axentia.se>
Subject: Re: [PATCH 29/33] fbcon: replace FB_EVENT_MODE_CHANGE/_ALL with
 direct calls
Message-ID: <20190521124259.GN21222@phenom.ffwll.local>
Mail-Followup-To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        =?utf-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= <mirq-linux@rere.qmqm.pl>,
        Yisheng Xie <ysxie@foxmail.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mikulas Patocka <mpatocka@redhat.com>, linux-fbdev@vger.kernel.org,
        Jingoo Han <jingoohan1@gmail.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Lee Jones <lee.jones@linaro.org>, Peter Rosin <peda@axentia.se>
References: <20190520082216.26273-1-daniel.vetter@ffwll.ch>
 <20190520082216.26273-30-daniel.vetter@ffwll.ch>
 <b91a6f78-43c2-796c-62f1-f84f2973c174@linux.intel.com>
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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 <daniel.vetter@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
> > ---
> >  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