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rs780: Implement `rs780_internal_gfx_disable` and add .disable pcie_ops 

That code will be used to disable the internal GFX card and enable the
external PCIe card.

The following lines from function `rs780_internal_gfx_enable()` are
taken and reversed.

	/* Disable external GFX and enable internal GFX. */
	l_dword = pci_read_config32(nb_dev, 0x8c);
	l_dword &= ~(1<<0);
	l_dword |= 1<<1;
	pci_write_config32(nb_dev, 0x8c, l_dword);

It has been tested on the M4A785T-M with the following card inside the
PCIe 16x slot:

  02:00.0 VGA compatible controller: nVidia Corporation GT218 [GeForce 210] (rev a2)

Change-Id: I7bd412b987fde98c97464175e2c7a384a8f0fb84
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2065
Tested-by: build bot (Jenkins)
This commit is contained in:
Denis 'GNUtoo' Carikli 2012-12-20 18:42:00 +01:00 committed by Paul Menzel
parent 9a0e3e2fc2
commit 34746a9c48
1 changed files with 18 additions and 0 deletions
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18
src/southbridge/amd/rs780/gfx.c
View File

@ -760,6 +760,23 @@ static void internal_gfx_pci_dev_init(struct device *dev)
clkind_write(dev, 0x5C, 0x0);
}
/**
* Set registers in RS780 and CPU to disable the internal GFX.
* Please refer to `rs780_internal_gfx_enable()`.
*/
static void rs780_internal_gfx_disable(device_t dev)
{
u32 l_dword;
device_t nb_dev = dev_find_slot(0, 0);
/* Disable internal GFX and enable external GFX. */
l_dword = pci_read_config32(nb_dev, 0x8c);
l_dword |= 1<<0;
l_dword &= ~(1<<1);
pci_write_config32(nb_dev, 0x8c, l_dword);
dev->enabled = 0;
}
/*
* Set registers in RS780 and CPU to enable the internal GFX.
@ -999,6 +1016,7 @@ static struct device_operations pcie_ops = {
.init = internal_gfx_pci_dev_init, /* The option ROM initializes the device. rs780_gfx_init, */
.scan_bus = 0,
.enable = rs780_internal_gfx_enable,
.disable = rs780_internal_gfx_disable,
.ops_pci = &lops_pci,
};