From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: [RFC][PATCH][6/8] PCI PM: Use pci_set_power_state during early resume Date: Sat, 7 Mar 2009 11:25:28 +0100 Message-ID: <200903071125.29502.rjw__39766.5505683564$1236424116$gmane$org@sisk.pl> References: <200902221837.49396.rjw@sisk.pl> <200903071119.16651.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200903071119.16651.rjw@sisk.pl> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.linux-foundation.org Errors-To: linux-pm-bounces@lists.linux-foundation.org To: LKML Cc: Arve@smtp1.linux-foundation.org, Jeremy Fitzhardinge , Jesse Barnes , Thomas Gleixner , "Eric W. Biederman" , Ingo Molnar , Linus Torvalds , pm list List-Id: linux-pm@vger.kernel.org From: Rafael J. Wysocki Once we have allowed timer interrupts to be enabled during the early phase of resuming devices, we are now able to use the generic pci_set_power_state() to put PCI devices into D0 at that time. Then, the platform-specific PM code will have a chance to handle devices that don't implement the native PCI PM or that require some additional, platform-specific operations to be carried out to power them up. Also, by doing this we can simplify the code quite a bit. Signed-off-by: Rafael J. Wysocki --- drivers/pci/pci.c | 48 +++++++++--------------------------------------- 1 file changed, 9 insertions(+), 39 deletions(-) Index: linux-2.6/drivers/pci/pci.c =================================================================== --- linux-2.6.orig/drivers/pci/pci.c +++ linux-2.6/drivers/pci/pci.c @@ -426,7 +426,6 @@ static inline int platform_pci_sleep_wak * given PCI device * @dev: PCI device to handle. * @state: PCI power state (D0, D1, D2, D3hot) to put the device into. - * @wait: If 'true', wait for the device to change its power state * * RETURN VALUE: * -EINVAL if the requested state is invalid. @@ -435,8 +434,7 @@ static inline int platform_pci_sleep_wak * 0 if device already is in the requested state. * 0 if device's power state has been successfully changed. */ -static int -pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state, bool wait) +static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) { u16 pmcsr; bool need_restore = false; @@ -481,10 +479,8 @@ pci_raw_set_power_state(struct pci_dev * break; case PCI_UNKNOWN: /* Boot-up */ if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot - && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) { + && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) need_restore = true; - wait = true; - } /* Fall-through: force to D0 */ default: pmcsr = 0; @@ -494,9 +490,6 @@ pci_raw_set_power_state(struct pci_dev * /* enter specified state */ pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr); - if (!wait) - return 0; - /* Mandatory power management transition delays */ /* see PCI PM 1.1 5.6.1 table 18 */ if (state == PCI_D3hot || dev->current_state == PCI_D3hot) @@ -521,7 +514,7 @@ pci_raw_set_power_state(struct pci_dev * if (need_restore) pci_restore_bars(dev); - if (wait && dev->bus->self) + if (dev->bus->self) pcie_aspm_pm_state_change(dev->bus->self); return 0; @@ -591,7 +584,7 @@ int pci_set_power_state(struct pci_dev * if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3)) return 0; - error = pci_raw_set_power_state(dev, state, true); + error = pci_raw_set_power_state(dev, state); if (state > PCI_D0 && platform_pci_power_manageable(dev)) { /* Allow the platform to finalize the transition */ @@ -1390,37 +1383,14 @@ void pci_allocate_cap_save_buffers(struc */ int pci_restore_standard_config(struct pci_dev *dev) { - pci_power_t prev_state; - int error; - - pci_update_current_state(dev, PCI_D0); - - prev_state = dev->current_state; - if (prev_state == PCI_D0) - goto Restore; - - error = pci_raw_set_power_state(dev, PCI_D0, false); - if (error) - return error; + pci_update_current_state(dev, PCI_UNKNOWN); - /* - * This assumes that we won't get a bus in B2 or B3 from the BIOS, but - * we've made this assumption forever and it appears to be universally - * satisfied. - */ - switch(prev_state) { - case PCI_D3cold: - case PCI_D3hot: - mdelay(pci_pm_d3_delay); - break; - case PCI_D2: - udelay(PCI_PM_D2_DELAY); - break; + if (dev->current_state != PCI_D0) { + int error = pci_set_power_state(dev, PCI_D0); + if (error) + return error; } - pci_update_current_state(dev, PCI_D0); - - Restore: return dev->state_saved ? pci_restore_state(dev) : 0; }