[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>

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index daaa486159cf37ae64d5329150466bf839272bdc..7a43020fa5835136ced2b4826ac3cffdd7823efb 100644 (file)
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -701,7 +701,6 @@ config FB_NVIDIA
        depends on FB && PCI
        select I2C_ALGOBIT if FB_NVIDIA_I2C
        select I2C if FB_NVIDIA_I2C
-       select FB_DDC if FB_NVIDIA_I2C
        select FB_MODE_HELPERS
        select FB_CFB_FILLRECT
        select FB_CFB_COPYAREA

diff --git a/drivers/video/nvidia/nv_i2c.c b/drivers/video/nvidia/nv_i2c.c
index e48de3c9fd13ff0ee1f35df67a85281a719e26fd..19eef3a090232854860ad993365993dc7e5f68f6 100644 (file)
--- 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 */