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authorPaul Parsons <lost.distance@yahoo.com>2012-06-03 11:33:52 +0100
committerFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>2012-07-08 14:03:02 +0000
commitfb18155925139caef33f5c2d0e60316c3c9c1aac (patch)
tree83b5698a88601b896e3552cb74a6142ecbdb1b7d
parentd65c8f312c7a7e0b14db8f361cc692a263025bf5 (diff)
downloadlinux-fb18155925139caef33f5c2d0e60316c3c9c1aac.tar.bz2
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@yahoo.com> Cc: Matt Reimer <mreimer@sdgsystems.com> Cc: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
-rw-r--r--drivers/video/w100fb.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/video/w100fb.c b/drivers/video/w100fb.c
index 90a2e30272ad..2f6b2b835f88 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);
}
}