diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2017-01-30 11:02:01 +0100 |
|---|---|---|
| committer | Sekhar Nori <nsekhar@ti.com> | 2017-01-31 12:55:13 +0100 |
| commit | 82dbe1a68fd65a4dae8f01e4f214221857f8161b (patch) | |
| tree | d6728713f4b2795f75edffd7bb2df8d92ea8437b /drivers/ata/ahci_da850.c | |
| parent | Linux 4.10-rc1 (diff) | |
| download | linux-82dbe1a68fd65a4dae8f01e4f214221857f8161b.tar.xz linux-82dbe1a68fd65a4dae8f01e4f214221857f8161b.zip | |
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 <bgolaszewski@baylibre.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Diffstat (limited to 'drivers/ata/ahci_da850.c')
| -rw-r--r-- | drivers/ata/ahci_da850.c | 16 |
1 files changed, 16 insertions, 0 deletions
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; |