[PATCH 7/9] drivers/video: fsl-diu-fb: only DIU modes 0 and 1 are supported

[Timur Tabi <timur@freescale.com>]

The Freescale DIU video controller supports five video "modes", but only
the first two are used by the driver.  The other three are special modes
that don't make sense for a framebuffer driver.  Therefore, there's no
point in keeping a global variable that indicates which mode we're
supposed to use.

Signed-off-by: Timur Tabi <timur@freescale.com>
---
 arch/powerpc/platforms/512x/mpc512x_shared.c |    2 +-
 drivers/video/fsl-diu-fb.c                   |   11 +++--------
 include/linux/fsl-diu-fb.h                   |    8 ++++----
 3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
index 3dc62f9..cfe958e 100644
--- a/arch/powerpc/platforms/512x/mpc512x_shared.c
+++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
@@ -253,7 +253,7 @@ void __init mpc512x_init_diu(void)
 	}
 
 	mode = in_be32(&diu_reg->diu_mode);
-	if (mode != MFB_MODE1) {
+	if (mode = MFB_MODE0) {
 		pr_info("%s: DIU OFF\n", __func__);
 		goto out;
 	}
diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index 0fd4c784..6539e70 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -52,7 +52,6 @@
 struct diu_hw {
 	struct diu __iomem *diu_reg;
 	spinlock_t reg_lock;
-	unsigned int mode;		/* DIU operation mode */
 };
 
 struct diu_addr {
@@ -426,7 +425,6 @@ static struct mfb_info mfb_template[] = {
 };
 
 static struct diu_hw dr = {
-	.mode = MFB_MODE1,
 	.reg_lock = __SPIN_LOCK_UNLOCKED(diu_hw.reg_lock),
 };
 
@@ -620,7 +618,7 @@ static void enable_lcdc(struct fb_info *info)
 	struct fsl_diu_data *machine_data = mfbi->parent;
 
 	if (!machine_data->fb_enabled) {
-		out_be32(&hw->diu_mode, dr.mode);
+		out_be32(&hw->diu_mode, MFB_MODE1);
 		machine_data->fb_enabled++;
 	}
 }
@@ -1390,9 +1388,6 @@ static int request_irq_local(int irq)
 		ints |=	INT_VSYNC;
 #endif
 
-		if (dr.mode = MFB_MODE2 || dr.mode = MFB_MODE3)
-			ints |= INT_VSYNC_WB;
-
 		/* Read to clear the status */
 		in_be32(&hw->int_status);
 		out_be32(&hw->int_mask, ints);
@@ -1558,7 +1553,7 @@ static int __devinit fsl_diu_probe(struct platform_device *pdev)
 	}
 
 	diu_mode = in_be32(&dr.diu_reg->diu_mode);
-	if (diu_mode != MFB_MODE1)
+	if (diu_mode = MFB_MODE0)
 		out_be32(&dr.diu_reg->diu_mode, 0);	/* disable DIU */
 
 	/* Get the IRQ of the DIU */
@@ -1611,7 +1606,7 @@ static int __devinit fsl_diu_probe(struct platform_device *pdev)
 	 * Let DIU display splash screen if it was pre-initialized
 	 * by the bootloader, set dummy area descriptor otherwise.
 	 */
-	if (diu_mode != MFB_MODE1)
+	if (diu_mode = MFB_MODE0)
 		out_be32(&dr.diu_reg->desc[0], machine_data->dummy_ad->paddr);
 
 	out_be32(&dr.diu_reg->desc[1], machine_data->dummy_ad->paddr);
diff --git a/include/linux/fsl-diu-fb.h b/include/linux/fsl-diu-fb.h
index 363d5e2..11c16a1 100644
--- a/include/linux/fsl-diu-fb.h
+++ b/include/linux/fsl-diu-fb.h
@@ -153,12 +153,12 @@ struct diu {
 	__be32 plut;
 } __attribute__ ((packed));
 
-/* Modes of operation of DIU */
+/*
+ * Modes of operation of DIU.  The DIU supports five different modes, but
+ * the driver only supports modes 0 and 1.
+ */
 #define MFB_MODE0	0	/* DIU off */
 #define MFB_MODE1	1	/* All three planes output to display */
-#define MFB_MODE2	2	/* Plane 1 to display, planes 2+3 written back*/
-#define MFB_MODE3	3	/* All three planes written back to memory */
-#define MFB_MODE4	4	/* Color bar generation */
 
 #endif /* __KERNEL__ */
 #endif /* __FSL_DIU_FB_H__ */
-- 
1.7.4.4