video/powerpc: don't touch DIU registers that we don't need
Several DIU registers were being initialized either unnecessarily or to
wrong values.
1) All interrupts were enabled even though there's no interrupt handler.
Interrupts were left enabled when booting Linux.
2) Don't configure a dummy area descriptor, since we don't support ADs
in U-Boot.
3) Don't configure any write-back buffer registers, since we don't use
that mode.
4) The default values for the THRESHOLDS, SYN_POL, and PLUT registers
should be used, so don't touch those registers either.
Signed-off-by: Timur Tabi <timur@freescale.com>
diff --git a/drivers/video/fsl_diu_fb.c b/drivers/video/fsl_diu_fb.c
index 648ffa3..a98cb67 100644
--- a/drivers/video/fsl_diu_fb.c
+++ b/drivers/video/fsl_diu_fb.c
@@ -271,7 +271,6 @@
struct diu *hw = (struct diu *)CONFIG_SYS_DIU_ADDR;
u8 *gamma_table_base;
unsigned int i, j;
- struct diu_ad *dummy_ad;
struct diu_addr gamma;
struct diu_addr cursor;
@@ -302,14 +301,6 @@
return -1;
}
- /* The AD struct for the dummy framebuffer and the FB itself */
- dummy_ad = allocate_fb(2, 4, 4, NULL);
- if (!dummy_ad) {
- printf("DIU: Out of memory\n");
- return -1;
- }
- dummy_ad->pix_fmt = 0x88883316;
-
/* read mode info */
info.var.xres = fsl_diu_mode_db->xres;
info.var.yres = fsl_diu_mode_db->yres;
@@ -376,10 +367,7 @@
out_be32(&hw->gamma, gamma.paddr);
out_be32(&hw->cursor, cursor.paddr);
out_be32(&hw->bgnd, 0x007F7F7F);
- out_be32(&hw->bgnd_wb, 0);
out_be32(&hw->disp_size, info.var.yres << 16 | info.var.xres);
- out_be32(&hw->wb_size, 0);
- out_be32(&hw->wb_mem_addr, 0);
out_be32(&hw->hsyn_para, info.var.left_margin << 22 |
info.var.hsync_len << 11 |
info.var.right_margin);
@@ -388,18 +376,13 @@
info.var.vsync_len << 11 |
info.var.lower_margin);
- out_be32(&hw->syn_pol, 0);
- out_be32(&hw->thresholds, 0x00037800);
- out_be32(&hw->int_status, 0);
- out_be32(&hw->int_mask, 0);
- out_be32(&hw->plut, 0x01F5F666);
/* Pixel Clock configuration */
diu_set_pixel_clock(info.var.pixclock);
/* Set the frame buffers */
out_be32(&hw->desc[0], virt_to_phys(ad));
- out_be32(&hw->desc[1], virt_to_phys(dummy_ad));
- out_be32(&hw->desc[2], virt_to_phys(dummy_ad));
+ out_be32(&hw->desc[1], 0);
+ out_be32(&hw->desc[2], 0);
/* Enable the DIU, set display to all three planes */
out_be32(&hw->diu_mode, 1);