diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-10-11 08:20:35 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-11 18:14:14 (GMT) |
| commit | 7e491092e442b3f8c0d90d470b398fdb74703ec7 (patch) | |
| tree | 22d7cd5bb83da4e669c2526bd7b18b6f23eecfcc /drivers/video/nvidia/nv_i2c.c | |
| parent | 53a5fbdc2dff55161a206ed1a1385a8fa8055c34 (diff) | |
| download | linux-7e491092e442b3f8c0d90d470b398fdb74703ec7.tar.xz | |
[PATCH] revert "nvidiafb: use generic ddc reading"
Olaf reports that this gave him a black screen.
Cc: Olaf Hering <olaf@aepfle.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/nvidia/nv_i2c.c')
| -rw-r--r-- | drivers/video/nvidia/nv_i2c.c | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/drivers/video/nvidia/nv_i2c.c b/drivers/video/nvidia/nv_i2c.c index e48de3c..19eef3a 100644 --- a/drivers/video/nvidia/nv_i2c.c +++ b/drivers/video/nvidia/nv_i2c.c @@ -160,12 +160,51 @@ 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; - - edid = fb_ddc_read(&par->chan[conn - 1].adapter); + 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 (!edid && conn == 1) { /* try to get from firmware */ |