Sorry for the delay.
Il Thu, Feb 08, 2007 at 01:19:08AM +0100, Giuseppe Bilotta ha scritto:
> On 2/8/07, Luca Tettamanti <[email protected]> wrote:
> >Il Tue, Feb 06, 2007 at 09:22:00PM +0000, James Simmons ha scritto:
> >> There is no stand alone nvidia card i2c driver. Its the issue of sharing
> >> device interfaces with the same hardware problem again!!!
> >
> >Nah, nvidiafb registers the I2C busses, you can drive them with whatever
> >you want through the devices exported by I2C core.
> >The fact the none of them work makes me think that the EDID is coming
> >from the BIOS, we do VBE calls in real mode during early kernel setup.
>
> So what am I supposed to do to dump it, since neither i2cdump neither
> get-edid seem to work?
Good question :)
The following patch fixes a real bug in SCL control and add a few debug
info. Can you try it?
diff --git a/drivers/video/nvidia/nv_i2c.c b/drivers/video/nvidia/nv_i2c.c
index 8454adf..ca8bd7e 100644
--- a/drivers/video/nvidia/nv_i2c.c
+++ b/drivers/video/nvidia/nv_i2c.c
@@ -25,6 +25,12 @@
#include "../edid.h"
+#define DDC_SDA_READ_MASK (1 << 3)
+#define DDC_SCL_READ_MASK (1 << 2)
+#define DDC_SDA_WRITE_MASK (1 << 4)
+#define DDC_SCL_WRITE_MASK (1 << 5)
+
+
static void nvidia_gpio_setscl(void *data, int state)
{
struct nvidia_i2c_chan *chan = data;
@@ -35,9 +41,9 @@ static void nvidia_gpio_setscl(void *data, int state)
val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0;
if (state)
- val |= 0x20;
+ val |= DDC_SDA_WRITE_MASK;
else
- val &= ~0x20;
+ val &= ~DDC_SDA_WRITE_MASK;
VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
VGA_WR08(par->PCIO, 0x3d5, val | 0x1);
@@ -53,9 +59,9 @@ static void nvidia_gpio_setsda(void *data, int state)
val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0;
if (state)
- val |= 0x10;
+ val |= DDC_SDA_WRITE_MASK;
else
- val &= ~0x10;
+ val &= ~DDC_SDA_WRITE_MASK;
VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
VGA_WR08(par->PCIO, 0x3d5, val | 0x1);
@@ -68,11 +74,9 @@ static int nvidia_gpio_getscl(void *data)
u32 val = 0;
VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base);
- if (VGA_RD08(par->PCIO, 0x3d5) & 0x04)
+ if (VGA_RD08(par->PCIO, 0x3d5) & DDC_SCL_READ_MASK)
val = 1;
- val = VGA_RD08(par->PCIO, 0x3d5);
-
return val;
}
@@ -83,7 +87,7 @@ static int nvidia_gpio_getsda(void *data)
u32 val = 0;
VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base);
- if (VGA_RD08(par->PCIO, 0x3d5) & 0x08)
+ if (VGA_RD08(par->PCIO, 0x3d5) & DDC_SDA_READ_MASK)
val = 1;
return val;
@@ -188,7 +192,7 @@ static u8 *nvidia_do_probe_i2c_edid(struct nvidia_i2c_chan *chan)
if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
return buf;
- dev_dbg(&chan->par->pci_dev->dev, "Unable to read EDID block.\n");
+ dev_warn(&chan->par->pci_dev->dev, "Unable to read EDID block.\n");
kfree(buf);
return NULL;
}
@@ -208,7 +212,10 @@ int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
if (!edid && conn == 1) {
/* try to get from firmware */
- const u8 *e = fb_firmware_edid(info->device);
+ const u8 *e;
+ printk("I2C probe failed for connector %d, falling back to firmware\n", conn);
+
+ e = fb_firmware_edid(info->device);
if (e != NULL)
edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
Luca
--
"La teoria e` quando sappiamo come funzionano le cose ma non funzionano.
La pratica e` quando le cose funzionano ma non sappiamo perche`.
Abbiamo unito la teoria e la pratica: le cose non funzionano piu` e non
sappiamo il perche`." -- A. Einstein
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