From: Benjamin Herrenschmidt This patch adds suspend/resume support to the Apple UniNorth AGP bridge to make sure AGP is properly disabled when the machine goes to sleep. Without this, the r300 based laptops will fail to wakeup from sleep when using the new experimental r300 DRI driver. It should also improve reliablility in general with other chips. Unfortunately, uninorth-agp is just a "sibling" of the video chip on the PCI bus, and thus ends up beeing called either before the video chip suspend routine, or after, depending on the HW layout or other random things. To make sure the device side of AGP is always disabled first and that we never touch the device after having put it into D2 state (which can be deadly), I also need the separate patch to radeonfb and aty128fb which will make them disabled their own side if not already done by the bridge driver. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras Signed-off-by: Andrew Morton --- 25-akpm/drivers/char/agp/uninorth-agp.c | 66 ++++++++++++++++++++++++++++++++ 1 files changed, 66 insertions(+) diff -puN drivers/char/agp/uninorth-agp.c~ppc32-uninorth-agp-suspend-support drivers/char/agp/uninorth-agp.c --- 25/drivers/char/agp/uninorth-agp.c~ppc32-uninorth-agp-suspend-support 2005-03-01 23:59:53.000000000 -0800 +++ 25-akpm/drivers/char/agp/uninorth-agp.c 2005-03-02 00:01:04.000000000 -0800 @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include "agp.h" @@ -51,6 +52,11 @@ static void uninorth_tlbflush(struct agp static void uninorth_cleanup(void) { + u32 tmp; + + pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, &tmp); + if (!(tmp & UNI_N_CFG_GART_ENABLE)) + return; pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_INVAL); pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, @@ -155,6 +161,62 @@ static void uninorth_agp_enable(struct a uninorth_tlbflush(NULL); } +#ifdef CONFIG_PM +static int agp_uninorth_suspend(struct pci_dev *pdev, pm_message_t state) +{ + u32 cmd; + u8 agp; + struct pci_dev *device = NULL; + + if (state != PMSG_SUSPEND) + return 0; + + /* turn off AGP on the video chip, if it was enabled */ + for_each_pci_dev(device) { + /* Don't touch the bridge yet, device first */ + if (device == pdev) + continue; + /* Only deal with devices on the same bus here, no Mac has a P2P + * bridge on the AGP port, and mucking around the entire PCI + * tree is source of problems on some machines because of a bug + * in some versions of pci_find_capability() when hitting a dead + * device + */ + if (device->bus != pdev->bus) + continue; + agp = pci_find_capability(device, PCI_CAP_ID_AGP); + if (!agp) + continue; + pci_read_config_dword(device, agp + PCI_AGP_COMMAND, &cmd); + if (!(cmd & PCI_AGP_COMMAND_AGP)) + continue; + printk("uninorth-agp: disabling AGP on device %s\n", + pci_name(device)); + cmd &= ~PCI_AGP_COMMAND_AGP; + pci_write_config_dword(device, agp + PCI_AGP_COMMAND, cmd); + } + + /* turn off AGP on the bridge */ + agp = pci_find_capability(pdev, PCI_CAP_ID_AGP); + pci_read_config_dword(pdev, agp + PCI_AGP_COMMAND, &cmd); + if (cmd & PCI_AGP_COMMAND_AGP) { + printk("uninorth-agp: disabling AGP on bridge %s\n", + pci_name(pdev)); + cmd &= ~PCI_AGP_COMMAND_AGP; + pci_write_config_dword(pdev, agp + PCI_AGP_COMMAND, cmd); + } + /* turn off the GART */ + uninorth_cleanup(); + + return 0; +} + +static int agp_uninorth_resume(struct pci_dev *pdev) +{ + return 0; +} +#endif + static int uninorth_create_gatt_table(struct agp_bridge_data *bridge) { char *table; @@ -369,6 +431,10 @@ static struct pci_driver agp_uninorth_pc .id_table = agp_uninorth_pci_table, .probe = agp_uninorth_probe, .remove = agp_uninorth_remove, +#ifdef CONFIG_PM + .suspend = agp_uninorth_suspend, + .resume = agp_uninorth_resume, +#endif }; static int __init agp_uninorth_init(void) _