From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [RFC PATCH 0/4] mmc: sdhci: Support maximum DMA latency request via PM QoS Date: Tue, 24 Mar 2015 15:40:36 +0200 Message-ID: <1427204440-3533-1-git-send-email-adrian.hunter@intel.com> Return-path: Received: from mga01.intel.com ([192.55.52.88]:32710 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752130AbbCXNmo (ORCPT ); Tue, 24 Mar 2015 09:42:44 -0400 Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Ulf Hansson Cc: linux-mmc , "Rafael J. Wysocki" , Len Brown , Pavel Machek , Kevin Hilman , Tomeu Vizoso , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Hi Here are some patches to address an issue with SDHCI in Intel Baytrail. Intel Baytrail has been observed sometimes to hang if host controllers are using DMA while deep C-states are used. Workaround that by specifying a maximum DMA latency that will prevent deep C-states. The first patch adds a new PM QOS function so that the SDHCI driver can do a "lazy" cancel of the QoS request from within its "finish" tasklet. The second patch adds support to SDHCI for specifying a maximum DMA latency. The third and fourth patches take that facility into use for Baytrail. Ad hoc testing with Lenovo Thinkpad 10 showed a stress test could run for at least 24 hours with the patches, compared to less than an hour without. These patches are on top of my driver strength patches which are on top of my re-tuning patches. Adrian Hunter (4): PM / QoS: Add pm_qos_cancel_request_lazy() that doesn't sleep mmc: sdhci: Support maximum DMA latency request via PM QOS mmc: sdhci-acpi: Fix device hang on Intel BayTrail mmc: sdhci-pci: Fix device hang on Intel BayTrail drivers/mmc/host/sdhci-acpi.c | 32 ++++++++++++++++++++++++++ drivers/mmc/host/sdhci-pci.c | 13 +++++++++++ drivers/mmc/host/sdhci.c | 52 +++++++++++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci.h | 7 ++++++ include/linux/pm_qos.h | 2 ++ kernel/power/qos.c | 20 +++++++++++++++++ 6 files changed, 126 insertions(+) Regards Adrian