From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751958Ab2HLOwo (ORCPT ); Sun, 12 Aug 2012 10:52:44 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:58986 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751711Ab2HLOwm (ORCPT ); Sun, 12 Aug 2012 10:52:42 -0400 From: David Herrmann To: linux-fbdev@vger.kernel.org Cc: Florian Tobias Schandinat , Greg Kroah-Hartman , linux-serial@vger.kernel.org, Alan Cox , linux-kernel@vger.kernel.org, Geert Uytterhoeven , David Herrmann Subject: [PATCH 08/11] fblog: cache framebuffer BLANK and SUSPEND states Date: Sun, 12 Aug 2012 16:53:22 +0200 Message-Id: <1344783205-2384-9-git-send-email-dh.herrmann@googlemail.com> X-Mailer: git-send-email 1.7.11.4 In-Reply-To: <1344783205-2384-1-git-send-email-dh.herrmann@googlemail.com> References: <1344783205-2384-1-git-send-email-dh.herrmann@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We must cache these states so we will never draw to the framebuffer while it is suspended or blanked. Signed-off-by: David Herrmann --- drivers/video/console/fblog.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/video/console/fblog.c b/drivers/video/console/fblog.c index aed77dc..8bcd0ce 100644 --- a/drivers/video/console/fblog.c +++ b/drivers/video/console/fblog.c @@ -33,6 +33,8 @@ enum fblog_flags { FBLOG_KILLED, FBLOG_OPEN, + FBLOG_SUSPENDED, + FBLOG_BLANKED, }; struct fblog_fb { @@ -264,6 +266,7 @@ static int fblog_event(struct notifier_block *self, unsigned long action, struct fb_event *event = data; struct fb_info *info = event->info; struct fblog_fb *fb; + int *blank; switch(action) { case FB_EVENT_FB_REGISTERED: @@ -291,6 +294,44 @@ static int fblog_event(struct notifier_block *self, unsigned long action, if (fb) fblog_close(fb, true); break; + case FB_EVENT_SUSPEND: + /* This is called when the low-level display driver suspends the + * video system. We should not access the video system while it + * is suspended. This is called with the console lock held. */ + mutex_lock(&fblog_registration_lock); + fb = fblog_fbs[info->node]; + mutex_unlock(&fblog_registration_lock); + + if (fb) + set_bit(FBLOG_SUSPENDED, &fb->flags); + break; + case FB_EVENT_RESUME: + /* This is called when the low-level display driver resumes + * operating. It is called with the console lock held. */ + mutex_lock(&fblog_registration_lock); + fb = fblog_fbs[info->node]; + mutex_unlock(&fblog_registration_lock); + + if (fb) + clear_bit(FBLOG_SUSPENDED, &fb->flags); + break; + case FB_EVENT_BLANK: + /* This gets called _after_ the framebuffer was successfully + * blanked. The console-lock is always held while fb_blank is + * called and during this callback. */ + mutex_lock(&fblog_registration_lock); + fb = fblog_fbs[info->node]; + mutex_unlock(&fblog_registration_lock); + + if (!fb) + break; + + blank = (int*)event->data; + if (*blank == FB_BLANK_UNBLANK) + clear_bit(FBLOG_BLANKED, &fb->flags); + else + set_bit(FBLOG_BLANKED, &fb->flags); + break; } return 0; -- 1.7.11.4