[ARM] 3357/1: enable frontlight on collie

Patch from Pavel Machek

Enable frontlight during collie bootup, so that display is actually
readable in anything other than bright sunlight.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index 159ad7ed7a40142c16093588fb0988963c675b29..d31b1cb7eea0d83ed2cb632ed07b42d593aad3c7 100644 (file)
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -629,6 +629,22 @@ static int locomo_resume(struct platform_device *dev)
 }
 #endif
 
+
+#define LCM_ALC_EN     0x8000
+
+void frontlight_set(struct locomo *lchip, int duty, int vr, int bpwf)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(&lchip->lock, flags);
+       locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+       udelay(100);
+       locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+       locomo_writel(bpwf | LCM_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+       spin_unlock_irqrestore(&lchip->lock, flags);
+}
+
+
 /**
  *     locomo_probe - probe for a single LoCoMo chip.
  *     @phys_addr: physical address of device.
@@ -688,6 +704,11 @@ __locomo_probe(struct device *me, struct resource *mem, int irq)
        /* FrontLight */
        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+
+       /* Same constants can be used for collie and poodle
+          (depending on CONFIG options in original sharp code)? */
+       frontlight_set(lchip, 163, 0, 148);
+
        /* Longtime timer */
        locomo_writel(0, lchip->base + LOCOMO_LTINT);
        /* SPI */