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video: w100fb: Reduce sleep mode battery discharge

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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>
This commit is contained in:
Paul Parsons 2012-06-03 11:33:52 +01:00 committed by Florian Tobias Schandinat
parent d65c8f312c
commit fb18155925
1 changed files with 12 additions and 0 deletions
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12
drivers/video/w100fb.c
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@ -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);
}
}