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Date: Thu, 19 Apr 2012 15:09:54 +0100 (BST) From: Paul Parsons <lost.distance@...oo.com> To: FlorianSchandinat@....de Cc: mreimer@...systems.com, philipp.zabel@...il.com, linux-kernel@...r.kernel.org Subject: [PATCH] video: w100fb: Reduce sleep mode battery discharge In 2006 and 2007 the handhelds.org kernel w100fb driver was patched to reduce sleep mode battery discharge. Unfortunately those two patches never migrated to the mainline kernel. Fortunately the function affected - w100_suspend() - has not changed since; thus those patches still apply cleanly. Applying those patches to linux-3.4-rc3 running on an HP iPAQ hx4700 reduces the sleep mode battery discharge from approximately 26 mA to approximately 11 mA. This patch combines those two patches into a single unified patch. Signed-off-by: Paul Parsons <lost.distance@...oo.com> Cc: Matt Reimer <mreimer@...systems.com> Cc: Philipp Zabel <philipp.zabel@...il.com> --- Many thanks to Matt Reimer for suggesting this. The seeming demise of handhelds.org has removed any formal patch logs. However the patches can still be viewed online: 2006 patch: http://paste.lisp.org/display/31700 2007 patch: http://osdir.com/ml/handhelds.linux.kernel/2007-02/msg00020.html And the fully patched handhelds.org kernel is still available, e.g.: http://www.linuxtogo.org/~goxboxlive/htcuniversal/Kernel/linux-2.6.21-hh20.tar.bz2 drivers/video/w100fb.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c index 90a2e30..2f6b2b8 100644 --- a/drivers/video/w100fb.c +++ b/drivers/video/w100fb.c @@ -1567,6 +1567,18 @@ static void w100_suspend(u32 mode) val = readl(remapped_regs + mmPLL_CNTL); val |= 0x00000004; /* bit2=1 */ writel(val, remapped_regs + mmPLL_CNTL); + + writel(0x00000000, remapped_regs + mmLCDD_CNTL1); + writel(0x00000000, remapped_regs + mmLCDD_CNTL2); + writel(0x00000000, remapped_regs + mmGENLCD_CNTL1); + writel(0x00000000, remapped_regs + mmGENLCD_CNTL2); + writel(0x00000000, remapped_regs + mmGENLCD_CNTL3); + + val = readl(remapped_regs + mmMEM_EXT_CNTL); + val |= 0xF0000000; + val &= ~(0x00000001); + writel(val, remapped_regs + mmMEM_EXT_CNTL); + writel(0x0000001d, remapped_regs + mmPWRMGT_CNTL); } } -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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