From mboxrd@z Thu Jan 1 00:00:00 1970 From: Doug Berger Subject: [PATCH 1/3] libata: Add the AHCI_HFLAG_YES_ALPM flag Date: Wed, 21 Jun 2017 16:20:12 -0700 Message-ID: <20170621232014.27790-2-opendmb@gmail.com> References: <20170621232014.27790-1-opendmb@gmail.com> Return-path: Received: from mail-qt0-f196.google.com ([209.85.216.196]:34998 "EHLO mail-qt0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752392AbdFUXUi (ORCPT ); Wed, 21 Jun 2017 19:20:38 -0400 In-Reply-To: <20170621232014.27790-1-opendmb@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: tj@kernel.org Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Berger Some hardware is capable of supporting Aggresive Link Power Management even though it is not indicated by the Host Capability register. This commit adds the AHCI_HFLAG_YES_ALPM flag to the AHCI library to allow indication of this quirk when the Host Capability register is Read Only and therefore cannot be changed. Signed-off-by: Doug Berger --- drivers/ata/ahci.h | 1 + drivers/ata/libahci.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index 30f67a1a4f54..ee176e4af97a 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -248,6 +248,7 @@ enum { AHCI_HFLAG_MULTI_MSI = 0, #endif AHCI_HFLAG_WAKE_BEFORE_STOP = (1 << 22), /* wake before DMA stop */ + AHCI_HFLAG_YES_ALPM = (1 << 23), /* force ALPM cap on */ /* ap->flags bits */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index b3a685ad9b87..4462f8a8cf2c 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -504,6 +504,11 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv) cap &= ~HOST_CAP_FBS; } + if (!(cap & HOST_CAP_ALPM) && (hpriv->flags & AHCI_HFLAG_YES_ALPM)) { + dev_info(dev, "controller can do ALPM, turning on CAP_ALPM\n"); + cap |= HOST_CAP_ALPM; + } + if (hpriv->force_port_map && port_map != hpriv->force_port_map) { dev_info(dev, "forcing port_map 0x%x -> 0x%x\n", port_map, hpriv->force_port_map); -- 2.13.0