On 11/7/2014 2:46 PM, Andy Shevchenko wrote:
On Fri, 2014-11-07 at 01:37 +0100, Rafael J. Wysocki wrote:
On Wednesday, November 05, 2014 06:34:44 PM Andy Shevchenko wrote:
The Intel BayTrail based machines have different configuration of the Low Power
Sub System (LPSS) IP. The LPSS contains few host controllers, such as I2C, SPI,
I2C and common DMA IP to serve DMA transfers. Unfortunately the DMA IP has no
power control accessible for software / OS. It goes automatically down whenever
last device goes to sleep and turned on when one of them is turned on. When
user tries to access the powered off DMA device the system hangs.
This patch series addressing the issue. Rafael suggested to create a 'proxy'
device which makes DMA to be powered on on the certain points of time.
Vinod, we would like to push this via Rafael's tree, so, please Ack or NAck the
patch 4/4.
Scott, do you have a chance to test this patch series against last linux-pm
tree on HP laptops? I would appreciate your Tested-by tag.
Andy Shevchenko (4):
ACPI / LPSS: add all LPSS devices to the specific power domain
ACPI / LPSS: allow to use specific PM domain during ->probe()
ACPI / LPSS: introduce a 'proxy' device to power on LPSS for DMA
dmaengine: dw: enable runtime PM
I'm essentially fine with this series, but I'm not sure what the status of
the Scott's testing is. Can you please tell me and Scott what in particular
you wanted him to test?
He complained that HP laptop didn't reboot nicely and hangs the system
until he blacklisted dw_dmac driver.
The patch series fixes runtime PM, though, so how is that related to
reboot exactly?
Rafael
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