From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Lin Subject: Re: [PATCH v3 2/3] mmc: sdhci-of-arasan: add phy support for sdhci-of-arasan Date: Tue, 20 Oct 2015 16:25:18 +0800 Message-ID: <5625FA6E.8070000@rock-chips.com> References: <1445324718-31407-1-git-send-email-shawn.lin@rock-chips.com> <5625EDAB.70707@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from lucky1.263xmail.com ([211.157.147.132]:33186 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753425AbbJTIkS (ORCPT ); Tue, 20 Oct 2015 04:40:18 -0400 In-Reply-To: <5625EDAB.70707@xilinx.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Michal Simek , Ulf Hansson , soren.brinkmann@xilinx.com Cc: shawn.lin@rock-chips.com, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org On 2015/10/20 15:30, Michal Simek wrote: > Hi, > > On 10/20/2015 09:05 AM, Shawn Lin wrote: >> This patch adds Generic PHY access for sdhci-of-arasan. Driver >> can get PHY handler from dt-binding, and power-on/init the PHY. >> Also we add pm ops for PHY here if CONFIG_PM_SLEEP is enabled. >> Currently, it's just mandatory for arasan,sdhci-5.1. >> >> Signed-off-by: Shawn Lin >> >> Serise-changes: 3 >> - remove phy_init/exit for suspend/resume >> - adjust phy_int/power_on seq to make code more reasonable >> - simplify suspend/resume_phy >> >> Serise-changes: 2 >> - Keep phy as a mandatory requirement for arasan,sdhci-5.1 >> >> --- >> >> Changes in v2: None >> >> drivers/mmc/host/sdhci-of-arasan.c | 87 ++++++++++++++++++++++++++= ++++++++++++ >> 1 file changed, 87 insertions(+) >> >> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/s= dhci-of-arasan.c >> index 75379cb..85bd0f9d 100644 >> --- a/drivers/mmc/host/sdhci-of-arasan.c >> +++ b/drivers/mmc/host/sdhci-of-arasan.c >> @@ -21,6 +21,7 @@ >> >> #include >> #include >> +#include >> #include "sdhci-pltfm.h" >> >> #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c >> @@ -35,6 +36,7 @@ >> */ >> struct sdhci_arasan_data { >> struct clk *clk_ahb; >> + struct phy *phy; >> }; >> >> static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_ho= st *host) >> @@ -70,6 +72,42 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata= =3D { >> >> #ifdef CONFIG_PM_SLEEP >> /** >> + * sdhci_arasan_suspend_phy - Suspend phy method for the driver >> + * @phy: Handler of phy structure >> + * Returns 0 on success and error value on error >> + * >> + * Put the phy in a deactive state. >> + */ > > This is not kernel-doc format. > Try this and fix it. > > ./scripts/kernel-doc -man -v drivers/mmc/host/sdhci-of-arasan.c > /de= v/null > okay, I will try to fix it. >> +static int sdhci_arasan_suspend_phy(struct phy *phy) >> +{ >> + int ret =3D 0; >> + >> + ret =3D phy_power_off(phy); >> + if (ret) >> + phy_power_on(phy); > > I am curious about this logic. If power_off fails I would expect that > phy could still have power_on. Or not? > That depends. From "ret", I cannot tell the failure type, whether it's=20 caused by *real power off fail* or by other generic phy stuff. So, I think it's better to power_on it again if we can't guarantee phy'= s=20 state. =EF=BC=9A=EF=BC=89 > Thanks, > Michal > > > --=20 Best Regards Shawn Lin