On Fri, 2014-11-07 at 17:30 +0100, Rafael J. Wysocki wrote: > 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? When he rebooted machine the dw_dmac driver was trying to access the HW when LPSS is off (this is my understanding of the issue), thus, it was stuck as long as he had dw_dmac loaded. > > Rafael > -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
