From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: [PATCH v1 0/4] ACPI / LPSS: fix system hangup on BYT Date: Wed, 5 Nov 2014 18:34:44 +0200 Message-ID: <1415205288-3356-1-git-send-email-andriy.shevchenko@linux.intel.com> Return-path: Received: from mga14.intel.com ([192.55.52.115]:45159 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754978AbaKEQfX (ORCPT ); Wed, 5 Nov 2014 11:35:23 -0500 Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Scott Ashcroft , Mika Westerberg , "Rafael J . Wysocki" , "Blin, Jerome" , linux-acpi@vger.kernel.org, Vinod Koul Cc: Andy Shevchenko 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 drivers/acpi/acpi_lpss.c | 94 +++++++++++++++++++++++++++++++++--------------- drivers/dma/dw/core.c | 11 ++++++ 2 files changed, 76 insertions(+), 29 deletions(-) -- 2.1.1