lkml.org 
[lkml]   [2016]   [Aug]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 2/4] mmc: sdhci-of-arasan: Control clock for accessing syscon
    Date
    In the eariler commit 65820199272d ("Documentation: mmc:
    sdhci-of-arasan: Add soc-ctl-syscon for corecfg regs"), we
    introduced syscon to control corecfg_* stuff provided by
    arasan. But given that we may need to ungate the clock for
    accessing corecfg_*, it not so perfect as it depends on
    whether specific clock driver disables it if not referenced.
    Meanwhile, if we don't need arasan contoller to work anymore,
    there is no reason to still enable it. So let's control this
    clock when needed.

    Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
    ---

    drivers/mmc/host/sdhci-of-arasan.c | 25 ++++++++++++++++++++++---
    1 file changed, 22 insertions(+), 3 deletions(-)

    diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
    index 0b3a9cf..7ae3ae4 100644
    --- a/drivers/mmc/host/sdhci-of-arasan.c
    +++ b/drivers/mmc/host/sdhci-of-arasan.c
    @@ -78,6 +78,7 @@ struct sdhci_arasan_soc_ctl_map {
    * struct sdhci_arasan_data
    * @host: Pointer to the main SDHCI host structure.
    * @clk_ahb: Pointer to the AHB clock
    + * @clk_syscon: Pointer to the optional clock for accessing syscon
    * @phy: Pointer to the generic phy
    * @is_phy_on: True if the PHY is on; false if not.
    * @sdcardclk_hw: Struct for the clock we might provide to a PHY.
    @@ -88,6 +89,7 @@ struct sdhci_arasan_soc_ctl_map {
    struct sdhci_arasan_data {
    struct sdhci_host *host;
    struct clk *clk_ahb;
    + struct clk *clk_syscon;
    struct phy *phy;
    bool is_phy_on;

    @@ -290,6 +292,7 @@ static int sdhci_arasan_suspend(struct device *dev)

    clk_disable(pltfm_host->clk);
    clk_disable(sdhci_arasan->clk_ahb);
    + clk_disable(sdhci_arasan->clk_syscon);

    return 0;
    }
    @@ -309,6 +312,12 @@ static int sdhci_arasan_resume(struct device *dev)
    struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
    int ret;

    + ret = clk_enable(sdhci_arasan->clk_syscon);
    + if (ret) {
    + dev_err(dev, "Cannot enable syscon clock.\n");
    + return ret;
    + }
    +
    ret = clk_enable(sdhci_arasan->clk_ahb);
    if (ret) {
    dev_err(dev, "Cannot enable AHB clock.\n");
    @@ -528,26 +537,33 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
    ret);
    goto err_pltfm_free;
    }
    +
    + sdhci_arasan->clk_syscon = devm_clk_get(&pdev->dev,
    + "clk_syscon");
    + if (clk_prepare_enable(sdhci_arasan->clk_syscon)) {
    + dev_err(&pdev->dev, "Unable to enable syscon clock.\n");
    + goto err_pltfm_free;
    + }
    }

    sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
    if (IS_ERR(sdhci_arasan->clk_ahb)) {
    dev_err(&pdev->dev, "clk_ahb clock not found.\n");
    ret = PTR_ERR(sdhci_arasan->clk_ahb);
    - goto err_pltfm_free;
    + goto clk_dis_syscon;
    }

    clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
    if (IS_ERR(clk_xin)) {
    dev_err(&pdev->dev, "clk_xin clock not found.\n");
    ret = PTR_ERR(clk_xin);
    - goto err_pltfm_free;
    + goto clk_dis_syscon;
    }

    ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
    if (ret) {
    dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
    - goto err_pltfm_free;
    + goto clk_dis_syscon;
    }

    ret = clk_prepare_enable(clk_xin);
    @@ -607,6 +623,8 @@ clk_disable_all:
    clk_disable_unprepare(clk_xin);
    clk_dis_ahb:
    clk_disable_unprepare(sdhci_arasan->clk_ahb);
    +clk_dis_syscon:
    + clk_disable_unprepare(sdhci_arasan->clk_syscon);
    err_pltfm_free:
    sdhci_pltfm_free(pdev);
    return ret;
    @@ -631,6 +649,7 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
    ret = sdhci_pltfm_unregister(pdev);

    clk_disable_unprepare(clk_ahb);
    + clk_disable_unprepare(sdhci_arasan->clk_syscon);

    return ret;
    }
    --
    2.3.7

    \
     
     \ /
      Last update: 2016-09-17 09:58    [W:7.578 / U:0.368 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site