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drivers/video: fsl-diu-fb: don't touch registers for unused features

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We don't use the writeback buffer, so don't initialize the registers for
that feature.

The default value for SYN_POL is already zero, so don't re-initialize it.

Writing the INT_STATUS register does nothing.

The value that we write to the PLUT register only makes sense on the
MPC8610 and P1022, so don't touch that register on the MPC5121.

Signed-off-by: Timur Tabi <timur@freescale.com>
This commit is contained in:
Timur Tabi 2012-10-16 17:33:49 -05:00
parent 7af3b136d4
commit ceb001b077
1 changed files with 15 additions and 8 deletions
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23
drivers/video/fsl-diu-fb.c
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@ -825,12 +825,8 @@ static void update_lcdc(struct fb_info *info)
out_be32(&hw->gamma, DMA_ADDR(data, gamma));
out_be32(&hw->cursor, DMA_ADDR(data, cursor));
out_be32(&hw->bgnd, 0x007F7F7F); /* BGND */
out_be32(&hw->bgnd_wb, 0); /* BGND_WB */
out_be32(&hw->disp_size, (var->yres << 16 | var->xres));
/* DISP SIZE */
out_be32(&hw->wb_size, 0); /* WB SIZE */
out_be32(&hw->wb_mem_addr, 0); /* WB MEM ADDR */
out_be32(&hw->bgnd, 0x007F7F7F); /* Set background to grey */
out_be32(&hw->disp_size, (var->yres << 16) | var->xres);
/* Horizontal and vertical configuration register */
temp = var->left_margin << 22 | /* BP_H */
@ -847,9 +843,20 @@ static void update_lcdc(struct fb_info *info)
diu_ops.set_pixel_clock(var->pixclock);
out_be32(&hw->syn_pol, 0); /* SYNC SIGNALS POLARITY */
out_be32(&hw->int_status, 0); /* INTERRUPT STATUS */
#ifndef CONFIG_PPC_MPC512x
/*
* The PLUT register is defined differently on the MPC5121 than it
* is on other SOCs. Unfortunately, there's no documentation that
* explains how it's supposed to be programmed, so for now, we leave
* it at the default value on the MPC5121.
*
* For other SOCs, program it for the highest priority, which will
* reduce the chance of underrun. Technically, we should scale the
* priority to match the screen resolution, but doing that properly
* requires delicate fine-tuning for each use-case.
*/
out_be32(&hw->plut, 0x01F5F666);
#endif
/* Enable the DIU */
enable_lcdc(info);