Hi Guennadi,
On Wed, Jun 13, 2012 at 03:37:19PM +0200, Guennadi Liakhovetski wrote:
> Regardless, whether the MMC bus clock is the same, as the PM clock on this
> specific interface, it has to be managed separately. Its proper management
> should also include enabling and disabling of the clock, whenever the
> interface is becoming active or going idle respectively.
>
> Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
> ---
> drivers/mmc/host/sh_mmcif.c | 46 +++++++++++++++++++++---------------------
> 1 files changed, 23 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
> index d6ffb05..6a93b04 100644
> --- a/drivers/mmc/host/sh_mmcif.c
> +++ b/drivers/mmc/host/sh_mmcif.c
> @@ -942,6 +942,7 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct
> mmc_ios *ios)
> }
> if (host->power) {
> pm_runtime_put(&host->pd->dev);
> + clk_disable(host->hclk);
> host->power = false;
> if (p->down_pwr && ios->power_mode == MMC_POWER_OFF)
> p->down_pwr(host->pd);
> @@ -954,6 +955,7 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct
> mmc_ios *ios)
> if (!host->power) {
> if (p->set_pwr)
> p->set_pwr(host->pd, ios->power_mode);
> + clk_enable(host->hclk);
> pm_runtime_get_sync(&host->pd->dev);
> host->power = true;
> sh_mmcif_sync_reset(host);
> @@ -1278,22 +1280,11 @@ static int __devinit sh_mmcif_probe(struct
> platform_device *pdev)
> host->addr = reg;
> host->timeout = 1000;
>
> - snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);
> - host->hclk = clk_get(&pdev->dev, clk_name);
> - if (IS_ERR(host->hclk)) {
> - dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
> - ret = PTR_ERR(host->hclk);
> - goto eclkget;
> - }
> - clk_enable(host->hclk);
> - host->clk = clk_get_rate(host->hclk);
> host->pd = pdev;
>
> spin_lock_init(&host->lock);
>
> mmc->ops = &sh_mmcif_ops;
> - mmc->f_max = host->clk / 2;
> - mmc->f_min = host->clk / 512;
> if (pd->ocr)
> mmc->ocr_avail = pd->ocr;
> mmc->caps = MMC_CAP_MMC_HIGHSPEED;
> @@ -1305,18 +1296,30 @@ static int __devinit sh_mmcif_probe(struct
> platform_device *pdev)
> mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size;
> mmc->max_seg_size = mmc->max_req_size;
>
> - sh_mmcif_sync_reset(host);
> platform_set_drvdata(pdev, host);
>
> pm_runtime_enable(&pdev->dev);
> host->power = false;
>
> + snprintf(clk_name, sizeof(clk_name), "mmc%d", pdev->id);
> + host->hclk = clk_get(&pdev->dev, clk_name);
> + if (IS_ERR(host->hclk)) {
> + ret = PTR_ERR(host->hclk);
> + dev_err(&pdev->dev, "cannot get clock \"%s\": %d\n", clk_name,
> ret);
> + goto eclkget;
> + }
> + clk_enable(host->hclk);
> + host->clk = clk_get_rate(host->hclk);
> + mmc->f_max = host->clk / 2;
> + mmc->f_min = host->clk / 512;
> +
> ret = pm_runtime_resume(&pdev->dev);
> if (ret < 0)
> goto eresume;
>
> INIT_DELAYED_WORK(&host->timeout_work, mmcif_timeout_work);
>
> + sh_mmcif_sync_reset(host);
> sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
>
> ret = request_threaded_irq(irq[0], sh_mmcif_intr, sh_mmcif_irqt, 0,
> "sh_mmc:error", host);
> @@ -1330,6 +1333,7 @@ static int __devinit sh_mmcif_probe(struct
> platform_device *pdev)
> goto ereqirq1;
> }
>
> + clk_disable(host->hclk);
> ret = mmc_add_host(mmc);
> if (ret < 0)
> goto emmcaddh;
Could you clarify the purpose of two hunks above.
They seem to move code down in sh_mmcif_probe().
Is this related to the call to pm_runtime_enable() ?
> @@ -1348,9 +1352,10 @@ ereqirq1:
> ereqirq0:
> pm_runtime_suspend(&pdev->dev);
> eresume:
> - pm_runtime_disable(&pdev->dev);
> clk_disable(host->hclk);
> + clk_put(host->hclk);
> eclkget:
> + pm_runtime_disable(&pdev->dev);
> mmc_free_host(mmc);
> ealloch:
> iounmap(reg);
> @@ -1363,6 +1368,7 @@ static int __devexit sh_mmcif_remove(struct
> platform_device *pdev)
> int irq[2];
>
> host->dying = true;
> + clk_enable(host->hclk);
> pm_runtime_get_sync(&pdev->dev);
>
> dev_pm_qos_hide_latency_limit(&pdev->dev);
> @@ -1388,9 +1394,9 @@ static int __devexit sh_mmcif_remove(struct
> platform_device *pdev)
>
> platform_set_drvdata(pdev, NULL);
>
> - clk_disable(host->hclk);
> mmc_free_host(host->mmc);
> pm_runtime_put_sync(&pdev->dev);
> + clk_disable(host->hclk);
> pm_runtime_disable(&pdev->dev);
>
> return 0;
> @@ -1399,24 +1405,18 @@ static int __devexit sh_mmcif_remove(struct
> platform_device *pdev)
> #ifdef CONFIG_PM
> static int sh_mmcif_suspend(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct sh_mmcif_host *host = platform_get_drvdata(pdev);
> + struct sh_mmcif_host *host = dev_get_drvdata(dev);
> int ret = mmc_suspend_host(host->mmc);
>
> - if (!ret) {
> + if (!ret)
> sh_mmcif_writel(host->addr, MMCIF_CE_INT_MASK, MASK_ALL);
> - clk_disable(host->hclk);
> - }
>
> return ret;
> }
>
> static int sh_mmcif_resume(struct device *dev)
> {
> - struct platform_device *pdev = to_platform_device(dev);
> - struct sh_mmcif_host *host = platform_get_drvdata(pdev);
> -
> - clk_enable(host->hclk);
> + struct sh_mmcif_host *host = dev_get_drvdata(dev);
>
> return mmc_resume_host(host->mmc);
> }
> --
> 1.7.2.5
>
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