On 04/03/16 12:24, Shawn Lin wrote: > Hi Adrian, > > On 2016/3/4 17:14, Adrian Hunter wrote: >> On 19/02/16 04:20, Shawn Lin wrote: >>> This patch adds Generic PHY access for sdhci-of-arasan. Driver > > [...] > >>> /** >>> * 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 >> >> Really should be a separate patch for the comment fixes. > > yep, I won't touch it when I rebase my patch for this topic. > >> >>> * >>> * 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 power off phy.\n"); >> >> I would expect you ought to call sdhci_resume_host() here. > > oh, got it. > >> >>> + 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 power on 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); >> >> I don't know that disabling clocks is necessarily the right thing to do if >> the resume fails. You might want to consider what happens if the system >> tries to use the device when it is in that state. It's been a long time >> since I did any ARM work but aren't you risking bus errors. Might just as >> well not bother and save a few lines of code. >> > > Firstly, I really just follow the orginal err handle. > It's risking bus errors if disabling ahb clk, but ahb clk is most very > likely to shared by many controllers. So regarding to the clk reference > count, the ahb_clk is not *really* disabled and just decrease the > reference count. How about keep these handles here? I would remove the error handling on the grounds that it does not do anything useful. > > >>> + return ret; >>> } >>> #endif /* ! CONFIG_PM_SLEEP */ >>> >>> @@ -183,6 +207,30 @@ 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"); >>> + goto err_phy_power; >>> + } >>> + } >>> + >>> ret = sdhci_add_host(host); >>> if (ret) >>> goto err_pltfm_free; >>> @@ -190,7 +238,12 @@ static int sdhci_arasan_probe(struct platform_device >>> *pdev) >>> return 0; >>> >>> err_pltfm_free: >>> + if (!IS_ERR(sdhci_arasan->phy)) >>> + phy_power_off(sdhci_arasan->phy); >>> sdhci_pltfm_free(pdev); >>> +err_phy_power: >>> + if (!IS_ERR(sdhci_arasan->phy)) >> >> Looks like you are using sdhci_arasan after it has been free'd by >> sdhci_pltfm_free(). >> >> Also there seem to be cases where sdhci_arasan_probe() can exit after >> sdhci_pltfm_init() without calling sdhci_pltfm_free(). > > Good catch, will fix it. > >> >>> + phy_exit(sdhci_arasan->phy); >>> clk_disable_all: >>> clk_disable_unprepare(clk_xin); >>> clk_dis_ahb: >>> @@ -205,6 +258,11 @@ 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(sdhci_arasan->phy); >>> + phy_exit(sdhci_arasan->phy); >>> + } >>> + >> >> When you re-base, take care to keep this chunk above >> sdhci_pltfm_unregister(). > > sure. > > Thanks for reviewing it. > >> >>> clk_disable_unprepare(sdhci_arasan->clk_ahb); >>> >>> return sdhci_pltfm_unregister(pdev); >>> >> >> >> >> > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html