[PATCH v4 3/6] ata: ahci_imx: AHB clock rate setting is not required on i.MX8QM AHCI SATA

i.MX8QM AHCI SATA doesn't need AHB clock rate to set the vendor specified TIMER1MS register. Do the AHB clock rate setting for i.MX53 and i.MX6Q AHCI SATA only.

Signed-off-by: Richard Zhu hongxing.zhu@nxp.com --- drivers/ata/ahci_imx.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c index 75258ed42d2ee..4dd98368f8562 100644 --- a/drivers/ata/ahci_imx.c +++ b/drivers/ata/ahci_imx.c @@ -872,12 +872,6 @@ static int imx_ahci_probe(struct platform_device *pdev) return PTR_ERR(imxpriv->sata_ref_clk); }

- imxpriv->ahb_clk = devm_clk_get(dev, "ahb"); - if (IS_ERR(imxpriv->ahb_clk)) { - dev_err(dev, "can't get ahb clock.\n"); - return PTR_ERR(imxpriv->ahb_clk); - } - if (imxpriv->type == AHCI_IMX6Q || imxpriv->type == AHCI_IMX6QP) { u32 reg_value;

@@ -937,11 +931,8 @@ static int imx_ahci_probe(struct platform_device *pdev) goto disable_clk;

/* - * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL, - * and IP vendor specific register IMX_TIMER1MS. - * Configure CAP_SSS (support stagered spin up). - * Implement the port0. - * Get the ahb clock rate, and configure the TIMER1MS register. + * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL. + * Set CAP_SSS (support stagered spin up) and Implement the port0. */ reg_val = readl(hpriv->mmio + HOST_CAP); if (!(reg_val & HOST_CAP_SSS)) { @@ -954,8 +945,19 @@ static int imx_ahci_probe(struct platform_device *pdev) writel(reg_val, hpriv->mmio + HOST_PORTS_IMPL); }

- reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000; - writel(reg_val, hpriv->mmio + IMX_TIMER1MS); + if (imxpriv->type != AHCI_IMX8QM) { + /* + * Get AHB clock rate and configure the vendor specified + * TIMER1MS register on i.MX53, i.MX6Q and i.MX6QP only. + */ + imxpriv->ahb_clk = devm_clk_get(dev, "ahb"); + if (IS_ERR(imxpriv->ahb_clk)) { + dev_err(dev, "Failed to get ahb clock\n"); + goto disable_sata; + } + reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000; + writel(reg_val, hpriv->mmio + IMX_TIMER1MS); + }

ret = ahci_platform_init_host(pdev, hpriv, &ahci_imx_port_info, &ahci_platform_sht);