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Message-Id: <200903250141.08478.rjw@sisk.pl>
Date: Wed, 25 Mar 2009 01:41:07 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Linux PCI <linux-pci@...r.kernel.org>,
pm list <linux-pm@...ts.linux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC][PATCH 1/2] PCI PM: Introduce __pci_[start|complete]_power_transition()
From: Rafael J. Wysocki <rjw@...k.pl>
The radeonfb driver needs to program the device's PMCSR directly due
to some quirky hardware it has to handle (see
http://bugzilla.kernel.org/show_bug.cgi?id=12846 for details) and
after doing that it needs to call the platform (usually ACPI) to
finish the power transition of the device. Currently it uses
pci_set_power_state() for this purpose, however making a specific
assumption about the internal behavior of this function, which has
changed recently so that this assumption is no longer satisfied.
For this reason, introduce __pci_complete_power_transition() that may
be called by the radeonfb driver to complete the power transition of
the device. For symmetry, introduce __pci_start_power_transition().
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
drivers/pci/pci.c | 66 +++++++++++++++++++++++++++++++++++++---------------
include/linux/pci.h | 1
2 files changed, 49 insertions(+), 18 deletions(-)
Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -540,6 +540,50 @@ void pci_update_current_state(struct pci
}
/**
+ * pci_platform_power_transition - Use platform to change device power state
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ */
+static int pci_platform_power_transition(
+ struct pci_dev *dev, pci_power_t state)
+{
+ int error = 0;
+
+ if (platform_pci_power_manageable(dev))
+ error = platform_pci_set_power_state(dev, state);
+
+ if (!error)
+ pci_update_current_state(dev, state);
+
+ return error;
+}
+
+/**
+ * __pci_start_power_transition - Start power transition of a PCI device
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ */
+static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
+{
+ if (state == PCI_D0)
+ pci_platform_power_transition(dev, PCI_D0);
+}
+
+/**
+ * __pci_complete_power_transition - Complete power transition of a PCI device
+ * @dev: PCI device to handle.
+ * @state: State to put the device into.
+ *
+ * This function should not be called directly by device drivers.
+ */
+int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state)
+{
+ return state > PCI_D0 ?
+ pci_platform_power_transition(dev, state) : -ENODEV;
+}
+EXPORT_SYMBOL_GPL(__pci_complete_power_transition);
+
+/**
* pci_set_power_state - Set the power state of a PCI device
* @dev: PCI device to handle.
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
@@ -575,16 +619,8 @@ int pci_set_power_state(struct pci_dev *
if (dev->current_state == state)
return 0;
- if (state == PCI_D0) {
- /*
- * Allow the platform to change the state, for example via ACPI
- * _PR0, _PS0 and some such, but do not trust it.
- */
- int ret = platform_pci_power_manageable(dev) ?
- platform_pci_set_power_state(dev, PCI_D0) : 0;
- if (!ret)
- pci_update_current_state(dev, PCI_D0);
- }
+ __pci_start_power_transition(dev, state);
+
/* This device is quirked not to be put into D3, so
don't put it in D3 */
if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
@@ -592,14 +628,8 @@ int pci_set_power_state(struct pci_dev *
error = pci_raw_set_power_state(dev, state);
- if (state > PCI_D0 && platform_pci_power_manageable(dev)) {
- /* Allow the platform to finalize the transition */
- int ret = platform_pci_set_power_state(dev, state);
- if (!ret) {
- pci_update_current_state(dev, state);
- error = 0;
- }
- }
+ if (!__pci_complete_power_transition(dev, state))
+ error = 0;
return error;
}
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -689,6 +689,7 @@ size_t pci_get_rom_size(struct pci_dev *
/* Power management related routines */
int pci_save_state(struct pci_dev *dev);
int pci_restore_state(struct pci_dev *dev);
+int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state);
int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state);
--
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