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Old 06-25-2008, 10:16 PM
Thomas Bogendoerfer
 
Default Bug#487257: gbefb: cmap FIFO timeout

Writes to the cmap fifo while the display is blanked caused cmap FIFO
timeout messages and a wrong colormap. To avoid this the driver now
maintains a colormap in memory and updates the colormap after the
display is unblanked.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

drivers/video/gbefb.c | 50 +++++++++++++++++++++++++++++++++---------------
1 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/drivers/video/gbefb.c b/drivers/video/gbefb.c
index 2e552d5..f89c3cc 100644
--- a/drivers/video/gbefb.c
+++ b/drivers/video/gbefb.c
@@ -87,6 +87,8 @@ static int gbe_revision;
static int ypan, ywrap;

static uint32_t pseudo_palette[16];
+static uint32_t gbe_cmap[256];
+static int gbe_turned_on; /* 0 turned off, 1 turned on */

static char *mode_option __initdata = NULL;

@@ -208,6 +210,8 @@ void gbe_turn_off(void)
int i;
unsigned int val, x, y, vpixen_off;

+ gbe_turned_on = 0;
+
/* check if pixel counter is on */
val = gbe->vt_xy;
if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 1)
@@ -371,6 +375,22 @@ static void gbe_turn_on(void)
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn on DMA timed out
");
+
+ gbe_turned_on = 1;
+}
+
+static void gbe_loadcmap(void)
+{
+ int i, j;
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 1000 && gbe->cm_fifo >= 63; j++)
+ udelay(10);
+ if (j == 1000)
+ printk(KERN_ERR "gbefb: cmap FIFO timeout
");
+
+ gbe->cmap[i] = gbe_cmap[i];
+ }
}

/*
@@ -382,6 +402,7 @@ static int gbefb_blank(int blank, struct fb_info *info)
switch (blank) {
case FB_BLANK_UNBLANK: /* unblank */
gbe_turn_on();
+ gbe_loadcmap();
break;

case FB_BLANK_NORMAL: /* blank */
@@ -796,16 +817,10 @@ static int gbefb_set_par(struct fb_info *info)
gbe->gmap[i] = (i << 24) | (i << 16) | (i << 8);

/* Initialize the color map */
- for (i = 0; i < 256; i++) {
- int j;
-
- for (j = 0; j < 1000 && gbe->cm_fifo >= 63; j++)
- udelay(10);
- if (j == 1000)
- printk(KERN_ERR "gbefb: cmap FIFO timeout
");
+ for (i = 0; i < 256; i++)
+ gbe_cmap[i] = (i << 8) | (i << 16) | (i << 24);

- gbe->cmap[i] = (i << 8) | (i << 16) | (i << 24);
- }
+ gbe_loadcmap();

return 0;
}
@@ -855,14 +870,17 @@ static int gbefb_setcolreg(unsigned regno, unsigned red, unsigned green,
blue >>= 8;

if (info->var.bits_per_pixel <= 8) {
- /* wait for the color map FIFO to have a free entry */
- for (i = 0; i < 1000 && gbe->cm_fifo >= 63; i++)
- udelay(10);
- if (i == 1000) {
- printk(KERN_ERR "gbefb: cmap FIFO timeout
");
- return 1;
+ gbe_cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
+ if (gbe_turned_on) {
+ /* wait for the color map FIFO to have a free entry */
+ for (i = 0; i < 1000 && gbe->cm_fifo >= 63; i++)
+ udelay(10);
+ if (i == 1000) {
+ printk(KERN_ERR "gbefb: cmap FIFO timeout
");
+ return 1;
+ }
+ gbe->cmap[regno] = gbe_cmap[regno];
}
- gbe->cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
} else if (regno < 16) {
switch (info->var.bits_per_pixel) {
case 15:



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