From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [PATCH] new fix: radeon backlight shutoff flashes momentarily Date: Mon, 30 Mar 2009 16:38:47 -0700 Message-ID: <20090330163847.c16bc1c9.akpm@linux-foundation.org> References: <49C719B2.8070701@earthlink.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sfi-mx-3.v28.ch3.sourceforge.com ([172.29.28.123] helo=mx.sourceforge.net) by 235xhf1.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1LoR6N-0004Sc-Rg for linux-fbdev-devel@lists.sourceforge.net; Mon, 30 Mar 2009 23:41:11 +0000 Received: from smtp1.linux-foundation.org ([140.211.169.13]) by 3b2kzd1.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69) id 1LoR69-0007nh-BJ for linux-fbdev-devel@lists.sourceforge.net; Mon, 30 Mar 2009 23:41:06 +0000 In-Reply-To: <49C719B2.8070701@earthlink.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: "Robert T. Drury" Cc: benh@kernel.crashing.org, linux-fbdev-devel@lists.sourceforge.net On Sun, 22 Mar 2009 22:10:10 -0700 "Robert T. Drury" wrote: > This patch should replace the previous > fix-radeon-backlight-shutoff-flashes-momentarily.patch added to -mm tree > > This replacement patch removes only the & ~LVDS_BL_MOD_EN on shutoff > and applies only to machine powerbook5,3 && CHIP_FAMILY_RV350. The above text is not a suitable changelog for this patch. > Signed-off-by: Robert Drury > > --- linux-2.6.23.9/drivers/video/aty/radeon_backlight.c.orig 2009-03-22 19:04:22.000000000 -0700 > +++ linux-2.6.23.9/drivers/video/aty/radeon_backlight.c 2009-03-22 19:19:09.000000000 -0700 > @@ -101,7 +101,10 @@ static int radeon_bl_update_status(struc > tmpPixclksCntl = INPLL(PIXCLKS_CNTL); > if (rinfo->is_mobility || rinfo->is_IGP) > OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); > - lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); > + lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK); > + if(rinfo->family != CHIP_FAMILY_RV350 > + || !machine_is_compatible("PowerBook5,3")) > + lvds_gen_cntl &= ~LVDS_BL_MOD_EN; > lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) << > LVDS_BL_MOD_LEVEL_SHIFT); > lvds_gen_cntl |= LVDS_DISPLAY_DIS; The text which I have for fix-radeon-backlight-shutoff-flashes-momentarily.patch is: Addresses http://bugzilla.kernel.org/show_bug.cgi?id=12845 Aluminum powerbook G4 with radeon. The backlight momentarily flashes brightly when turning off. If the backlight is originally dim, the flash is more noticeable. This momentary flash is stressful on the power circuit. The first OUTREG to LVDS_GEN_CNTL causes the flashing problem. To fix, remove the first manipulation of lvds_gen_cntl above it. Second manipulation of lvds_gen_cntl does nothing (level always zero). The first manipulation was needed so the display would not be garbled after turning the backlight back on, but at least on my powerbook, the garbling seems to go away when the udelay is 1000. but as that is no longer appropriate to the new patch, there's nothing I can do. I'll drop the old patch. Please resend. ------------------------------------------------------------------------------