Patch set updated for coreboot: f5d7954 rs780: Implement `rs780_internal_gfx_disable` and add .disable pcie_ops

[Paul Menzel]

Paul Menzel ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2065

-gerrit

commit f5d7954799070621aabf9c18ec249fae5fcab68d
Author: Denis 'GNUtoo' Carikli 
Date:   Thu Dec 20 18:42:00 2012 +0100

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 bits 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 
    Signed-off-by: Paul Menzel 
---
 src/southbridge/amd/rs780/gfx.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/southbridge/amd/rs780/gfx.c b/src/southbridge/amd/rs780/gfx.c
index f70cd9b..f4a5120 100644
--- a/src/southbridge/amd/rs780/gfx.c
+++ b/src/southbridge/amd/rs780/gfx.c
@@ -760,6 +760,24 @@ 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 +1017,7 @@ 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,
 };