From 82dbe1a68fd65a4dae8f01e4f214221857f8161b Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Mon, 30 Jan 2017 11:02:01 +0100 Subject: sata: ahci-da850: get the sata clock using a connection id In preparation for using two clocks in the driver (the sysclk2-based clock and the external REFCLK), check if we got the functional clock after calling ahci_platform_get_resources(). If not, retry calling clk_get() with con_id specified. Signed-off-by: Bartosz Golaszewski Acked-by: Tejun Heo Signed-off-by: Sekhar Nori --- drivers/ata/ahci_da850.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/ata/ahci_da850.c') diff --git a/drivers/ata/ahci_da850.c b/drivers/ata/ahci_da850.c index 267a3d3..e397bab 100644 --- a/drivers/ata/ahci_da850.c +++ b/drivers/ata/ahci_da850.c @@ -71,12 +71,28 @@ static int ahci_da850_probe(struct platform_device *pdev) struct ahci_host_priv *hpriv; struct resource *res; void __iomem *pwrdn_reg; + struct clk *clk; int rc; hpriv = ahci_platform_get_resources(pdev); if (IS_ERR(hpriv)) return PTR_ERR(hpriv); + /* + * Internally ahci_platform_get_resources() calls clk_get(dev, NULL) + * when trying to obtain the functional clock. This SATA controller + * uses two clocks for which we specify two connection ids. If we don't + * have the functional clock at this point - call clk_get() again with + * con_id = "fck". + */ + if (!hpriv->clks[0]) { + clk = clk_get(dev, "fck"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + hpriv->clks[0] = clk; + } + rc = ahci_platform_enable_resources(hpriv); if (rc) return rc; -- cgit v1.1