On Sat, 2007-02-24 at 10:16 +0100, Giuseppe Bilotta wrote:
> On 2/24/07, Antonino A. Daplas <[email protected]> wrote:
> > On Fri, 2007-02-23 at 14:34 +0100, Giuseppe Bilotta wrote:
> > >
> > > The snowy is constant and abundant, and it seems to be independent of
> > > video size (640 through 1600) and screen occupation (single prompt
> > > line to fullscreen mc session) and usage.
> > >
> > > > I presume that X's nv driver or vesafb does not exhibit this problem?
> > >
> > > X's nv gives a very clean display, /unless/ I load nvidiafb before: if
> > > I modprobe nvidiafb (it's a module, and it's blacklisted precisely for
> > > this reason), then the screen is very snowy with X's nv too.
> > >
> >
> > Hmm..., I really don't know how to fix this except to look at Xorg's
> > code and look for a difference.
>
> Keep in mind that setting nvidiafb to totally ignore the EDID (either
> by not compiling in EDID support or by using e.g. the ignoreedid patch
> I had proposed) the snow effect is extremely reduced,
I did not know that, just scanned the entire thread. Try this patch, it
makes use of fb_ddc_read*() which I believe has extra steps to prevent
display corruption. It also incorporates Luca's i2c fix.
Tony
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 <[email protected]>
---
drivers/video/nvidia/nv_i2c.c | 44 ++---------------------------------------
1 files changed, 2 insertions(+), 42 deletions(-)
diff --git a/drivers/video/nvidia/nv_i2c.c b/drivers/video/nvidia/nv_i2c.c
index b858897..b91d404 100644
--- a/drivers/video/nvidia/nv_i2c.c
+++ b/drivers/video/nvidia/nv_i2c.c
@@ -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 nvi
}
-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 */
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