From: Bartosz Golaszewski Date: Mon, 30 Jan 2017 10:02:01 +0000 (+0100) Subject: sata: ahci-da850: get the sata clock using a connection id X-Git-Tag: rel_imx_4.19.35_1.1.0~13088^2^2~5 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=82dbe1a68fd65a4dae8f01e4f214221857f8161b;p=linux.git 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 --- diff --git a/drivers/ata/ahci_da850.c b/drivers/ata/ahci_da850.c index 267a3d3e79f4..e397bab80a23 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;