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nvidiafb: bring back generic ddc reading 

Make nvidiafb use fb_ddc_read().  This patch was submitted before but was
reverted due to problems in a non-x86 platform.  This includes a fix for that
where ddc reading is bypassed if there is no DDC bus (duh).

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonino A. Daplas 2007-05-08 00:37:27 -07:00 committed by Linus Torvalds
parent 71c6efd993
commit 66fd14120e
1 changed files with 2 additions and 42 deletions
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44
drivers/video/nvidia/nv_i2c.c
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@ -70,8 +70,6 @@ static int nvidia_gpio_getscl(void *data)
if (VGA_RD08(par->PCIO, 0x3d5) & 0x04)
val = 1;
val = VGA_RD08(par->PCIO, 0x3d5);
return val;
}
@ -159,51 +157,13 @@ void nvidia_delete_i2c_busses(struct nvidia_par *par)
}
static u8 *nvidia_do_probe_i2c_edid(struct nvidia_i2c_chan *chan)
{
u8 start = 0x0;
struct i2c_msg msgs[] = {
{
.addr = 0x50,
.len = 1,
.buf = &start,
}, {
.addr = 0x50,
.flags = I2C_M_RD,
.len = EDID_LENGTH,
},
};
u8 *buf;
if (!chan->par)
return NULL;
buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!buf) {
dev_warn(&chan->par->pci_dev->dev, "Out of memory!\n");
return NULL;
}
msgs[1].buf = buf;
if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
return buf;
dev_dbg(&chan->par->pci_dev->dev, "Unable to read EDID block.\n");
kfree(buf);
return NULL;
}
int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
{
struct nvidia_par *par = info->par;
u8 *edid = NULL;
int i;
for (i = 0; i < 3; i++) {
/* Do the real work */
edid = nvidia_do_probe_i2c_edid(&par->chan[conn - 1]);
if (edid)
break;
}
if (par->chan[conn - 1].par)
edid = fb_ddc_read(&par->chan[conn - 1].adapter);
if (!edid && conn == 1) {
/* try to get from firmware */