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Date: Thu, 22 Oct 2015 13:36:56 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Shawn Lin <shawn.lin@...k-chips.com>
Cc: Michal Simek <michal.simek@...inx.com>,
Soren Brinkmann <soren.brinkmann@...inx.com>,
linux-mmc <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v4 2/3] mmc: sdhci-of-arasan: add phy support for sdhci-of-arasan
On 22 October 2015 at 11:06, Shawn Lin <shawn.lin@...k-chips.com> 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 <shawn.lin@...k-chips.com>
>
> Serise-changes: 4
> - remove suspend/resume_phy
> - add err handle label for system PM callback
> - fix comments of struct sdhci_arasan_data and system PM
> callback suggested by Michal
>
> 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 | 63 +++++++++++++++++++++++++++++++++++---
> 1 file changed, 59 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 75379cb..4f30716 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -21,6 +21,7 @@
>
> #include <linux/module.h>
> #include <linux/of_device.h>
> +#include <linux/phy/phy.h>
> #include "sdhci-pltfm.h"
>
> #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
> @@ -32,9 +33,11 @@
> /**
> * struct sdhci_arasan_data
> * @clk_ahb: Pointer to the AHB clock
> + * @phy: Pointer to the generic phy
> */
> struct sdhci_arasan_data {
> struct clk *clk_ahb;
> + struct phy *phy;
> };
>
> static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
> @@ -72,7 +75,7 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata = {
> /**
> * sdhci_arasan_suspend - Suspend method for the driver
> * @dev: Address of the device structure
> - * Returns 0 on success and error value on error
> + * Return: 0 on success and error value on error
> *
> * Put the device in a low power state.
> */
> @@ -88,6 +91,14 @@ static int sdhci_arasan_suspend(struct device *dev)
> if (ret)
> return ret;
>
> + if (!IS_ERR(sdhci_arasan->phy)) {
> + ret = phy_power_off(sdhci_arasan->phy);
> + if (ret) {
> + dev_err(dev, "Cannot suspend phy.\n");
> + return ret;
> + }
> + }
> +
> clk_disable(pltfm_host->clk);
> clk_disable(sdhci_arasan->clk_ahb);
>
> @@ -97,7 +108,7 @@ static int sdhci_arasan_suspend(struct device *dev)
> /**
> * sdhci_arasan_resume - Resume method for the driver
> * @dev: Address of the device structure
> - * Returns 0 on success and error value on error
> + * Return: 0 on success and error value on error
> *
> * Resume operation after suspend
> */
> @@ -118,11 +129,24 @@ static int sdhci_arasan_resume(struct device *dev)
> ret = clk_enable(pltfm_host->clk);
> if (ret) {
> dev_err(dev, "Cannot enable SD clock.\n");
> - clk_disable(sdhci_arasan->clk_ahb);
> - return ret;
> + goto err_clk_en;
> + }
> +
> + if (!IS_ERR(sdhci_arasan->phy)) {
> + ret = phy_power_on(sdhci_arasan->phy);
> + if (ret) {
> + dev_err(dev, "Cannot resume phy.\n");
> + goto err_phy_power;
> + }
> }
>
> return sdhci_resume_host(host);
> +
> +err_phy_power:
> + clk_disable(pltfm_host->clk);
> +err_clk_en:
> + clk_disable(sdhci_arasan->clk_ahb);
> + return ret;
> }
> #endif /* ! CONFIG_PM_SLEEP */
>
> @@ -188,6 +212,31 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
> goto clk_disable_all;
> }
>
> + sdhci_arasan->phy = ERR_PTR(-ENODEV);
> + if (of_device_is_compatible(pdev->dev.of_node,
> + "arasan,sdhci-5.1")) {
> + sdhci_arasan->phy = devm_phy_get(&pdev->dev,
> + "phy_arasan");
> + if (IS_ERR(sdhci_arasan->phy)) {
> + ret = PTR_ERR(sdhci_arasan->phy);
> + dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
> + goto clk_disable_all;
> + }
> +
> + ret = phy_init(sdhci_arasan->phy);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "phy_init err.\n");
> + goto clk_disable_all;
> + }
> +
> + ret = phy_power_on(sdhci_arasan->phy);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "phy_power_on err.\n");
> + phy_exit(sdhci_arasan->phy);
Remove phy_exit() here, as it's taken care of from the below goto.
> + goto err_phy_power;
> + }
> + }
> +
> ret = sdhci_add_host(host);
> if (ret)
> goto err_pltfm_free;
> @@ -196,6 +245,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>
> err_pltfm_free:
> sdhci_pltfm_free(pdev);
There is a missing call to phy_power_off() in some error cases.
> +err_phy_power:
> + if (!IS_ERR(sdhci_arasan->phy))
> + phy_exit(sdhci_arasan->phy);
> clk_disable_all:
> clk_disable_unprepare(clk_xin);
> clk_dis_ahb:
> @@ -210,6 +262,9 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
>
> + if (!IS_ERR(sdhci_arasan->phy))
phy_power_off() is needed here as well.
> + phy_exit(sdhci_arasan->phy);
> +
> clk_disable_unprepare(sdhci_arasan->clk_ahb);
>
> return sdhci_pltfm_unregister(pdev);
> --
Kind regards
Uffe
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