From 3c03ec209af1dd8223888630482f1b2353dc6284 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Tue, 16 Oct 2007 01:29:20 -0700 Subject: [PATCH] nvidiafb: Add boot option to reverse i2c port assignment There are a few nvidia hardware where the i2c port assignments are reversed, i.e., the 1st i2c port is assigned to the secondary display and the 2nd i2c port to the primary display. In most cases, if only 1 display is attached, or if only 1 flatpanel and 1 analog display is attached, the port reversal is of no consequence. However if 2 flatpanels are attached, it can cause display problems. There is no sane way of determining if the hardware reversed the i2c port assignment, so the simplest fix is to add a boot/module option, "reverse_i2c to explicitly reverse the i2c port. This also restores i2c ordering back to the pre-2.6.22 state. Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/nvidia/nv_i2c.c | 8 ++++---- drivers/video/nvidia/nv_type.h | 1 + drivers/video/nvidia/nvidia.c | 6 ++++++ 3 files changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/video/nvidia/nv_i2c.c b/drivers/video/nvidia/nv_i2c.c index afe4567e1ff4..0cbcb3d833fb 100644 --- a/drivers/video/nvidia/nv_i2c.c +++ b/drivers/video/nvidia/nv_i2c.c @@ -125,11 +125,11 @@ void nvidia_create_i2c_busses(struct nvidia_par *par) par->chan[1].par = par; par->chan[2].par = par; - par->chan[0].ddc_base = 0x36; - nvidia_setup_i2c_bus(&par->chan[0], "nvidia #0", I2C_CLASS_HWMON); + par->chan[0].ddc_base = (par->reverse_i2c) ? 0x36 : 0x3e; + nvidia_setup_i2c_bus(&par->chan[0], "nvidia #0", 0); - par->chan[1].ddc_base = 0x3e; - nvidia_setup_i2c_bus(&par->chan[1], "nvidia #1", 0); + par->chan[1].ddc_base = (par->reverse_i2c) ? 0x3e : 0x36; + nvidia_setup_i2c_bus(&par->chan[1], "nvidia #1", I2C_CLASS_HWMON); par->chan[2].ddc_base = 0x50; nvidia_setup_i2c_bus(&par->chan[2], "nvidia #2", 0); diff --git a/drivers/video/nvidia/nv_type.h b/drivers/video/nvidia/nv_type.h index 2fdf77ec39fc..f132aab8c5de 100644 --- a/drivers/video/nvidia/nv_type.h +++ b/drivers/video/nvidia/nv_type.h @@ -135,6 +135,7 @@ struct nvidia_par { int paneltweak; int LVDS; int pm_state; + int reverse_i2c; u32 crtcSync_read; u32 fpSyncs; u32 dmaPut; diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c index a7fe214f0f77..30e14eb1f51e 100644 --- a/drivers/video/nvidia/nvidia.c +++ b/drivers/video/nvidia/nvidia.c @@ -79,6 +79,7 @@ static int noscale __devinitdata = 0; static int paneltweak __devinitdata = 0; static int vram __devinitdata = 0; static int bpp __devinitdata = 8; +static int reverse_i2c __devinitdata; #ifdef CONFIG_MTRR static int nomtrr __devinitdata = 0; #endif @@ -1305,6 +1306,7 @@ static int __devinit nvidiafb_probe(struct pci_dev *pd, par->CRTCnumber = forceCRTC; par->FpScale = (!noscale); par->paneltweak = paneltweak; + par->reverse_i2c = reverse_i2c; /* enable IO and mem if not already done */ pci_read_config_word(pd, PCI_COMMAND, &cmd); @@ -1486,6 +1488,8 @@ static int __devinit nvidiafb_setup(char *options) noaccel = 1; } else if (!strncmp(this_opt, "noscale", 7)) { noscale = 1; + } else if (!strncmp(this_opt, "reverse_i2c", 11)) { + reverse_i2c = 1; } else if (!strncmp(this_opt, "paneltweak:", 11)) { paneltweak = simple_strtoul(this_opt+11, NULL, 0); } else if (!strncmp(this_opt, "vram:", 5)) { @@ -1582,6 +1586,8 @@ MODULE_PARM_DESC(mode_option, "Specify initial video mode"); module_param(bpp, int, 0); MODULE_PARM_DESC(bpp, "pixel width in bits" "(default=8)"); +module_param(reverse_i2c, int, 0); +MODULE_PARM_DESC(reverse_i2c, "reverse port assignment of the i2c bus"); #ifdef CONFIG_MTRR module_param(nomtrr, bool, 0); MODULE_PARM_DESC(nomtrr, "Disables MTRR support (0 or 1=disabled) " -- 2.30.2