From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andres Salomon Subject: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend Date: Sat, 8 Mar 2008 20:49:27 -0500 Message-ID: <20080308204927.73afa56c@ephemeral> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1JYAbo-000897-N2 for linux-fbdev-devel@lists.sourceforge.net; Sat, 08 Mar 2008 17:45:52 -0800 Received: from mail.queued.net ([207.210.101.209]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1JYAbn-0003xK-9R for linux-fbdev-devel@lists.sourceforge.net; Sat, 08 Mar 2008 17:45:52 -0800 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: adaplas@gmail.com Cc: linux-fbdev-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, info-linux@geode.amd.com, Andrew@sc8-sf-spam2.sourceforge.net, Jordan Crouse , Morton This is purely for suspend/resume time optimization. >From 874aa20022a2501a30704163ed31a7baba7de9e5 Mon Sep 17 00:00:00 2001 From: Andres Salomon Date: Wed, 5 Mar 2008 16:40:25 -0500 Subject: [PATCH] PM: add config option that allows disabling of VT switch during suspend Prior to suspend, we allocate and switch to a new VT; after suspend, we switch back to the original VT. This can be slow, and is completely unnecessary if the framebuffer we're using can restore video properly. This adds CONFIG_DISABLE_SUSPEND_VT_SWITCH which allows the user to select whether or not to do that switch. This has been tested with the gxfb driver (on a Geode GX dev board and OLPC prototype machines). In order for the user to even see this option, a framebuffer has to declare support for it (via CONFIG_FBDEV_SUPPORTS_NOSWITCH). Signed-off-by: Andres Salomon --- drivers/char/Kconfig | 21 +++++++++++++++++++++ drivers/video/geode/Kconfig | 1 + include/linux/suspend.h | 2 +- kernel/power/console.c | 2 +- 4 files changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 47c6be8..7fe0e85 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -58,6 +58,27 @@ config VT_CONSOLE If unsure, say Y. +config FBDEV_SUPPORTS_NOSWITCH + bool + default n + +config DISABLE_SUSPEND_VT_SWITCH + bool "Disable the console switch prior to suspend (EXPERIMENTAL)" + depends on VT_CONSOLE && PM && EXPERIMENTAL && FBDEV_SUPPORTS_NOSWITCH + default n + ---help--- + This option disables the automatic switch to VT console that happens + prior to Linux going into a suspend/sleep. Your + video card/framebuffer must be able to properly restore the + display (even if X is doing something crazy!) in this scenario. + This is useful for saving precious milliseconds during suspend and + resume; however, if your framebuffer lacks support, it could leave + your display in a weird state. If you're even seeing this option, + it means at least one of your selected framebuffer drivers supports + restoring the display. + + If unsure, say N. + config HW_CONSOLE bool depends on VT && !S390 && !UML diff --git a/drivers/video/geode/Kconfig b/drivers/video/geode/Kconfig index c5d8ba4..1497fe4 100644 --- a/drivers/video/geode/Kconfig +++ b/drivers/video/geode/Kconfig @@ -29,6 +29,7 @@ config FB_GEODE_GX select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT + select FBDEV_SUPPORTS_NOSWITCH ---help--- Framebuffer driver for the display controller integrated into the AMD Geode GX processors. diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 1d7d4c5..46080f5 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -11,7 +11,7 @@ #include #include -#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) +#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) && !defined(CONFIG_DISABLE_SUSPEND_VT_SWITCH) extern int pm_prepare_console(void); extern void pm_restore_console(void); #else diff --git a/kernel/power/console.c b/kernel/power/console.c index 89bcf49..dca98f5 100644 --- a/kernel/power/console.c +++ b/kernel/power/console.c @@ -9,7 +9,7 @@ #include #include "power.h" -#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) +#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) && !defined(CONFIG_DISABLE_SUSPEND_VT_SWITCH) #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) static int orig_fgconsole, orig_kmsg; -- 1.5.3.7 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/