Re: [PATCH v1 2/3] PCI: imx6: move the wait for clock stabilization to enable ref clk

Frank Li
2024-08-19T14:45:25Z

On Mon, Aug 19, 2024 at 11:03:18AM +0200, Stefan Eichenberger wrote:
> From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
>
> After enabling the ref clock, we should wait for the clock to stabilize.
> To eliminate the need for code duplication in the future, move the
> usleep to the enable_ref_clk function.

Logically, it's better wait in imx6_pcie_clk_enable(). But not sure why
it can reduce duplication.

Frank

>
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index fda704d82431f..f17561791e35a 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -632,6 +632,9 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> break;
> }
>
> + /* allow the clocks to stabilize */
> + usleep_range(200, 500);
> +
> return ret;
> }
>
> @@ -672,8 +675,6 @@ static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
> goto err_ref_clk;
> }
>
> - /* allow the clocks to stabilize */
> - usleep_range(200, 500);
> return 0;
>
> err_ref_clk:
> --
> 2.43.0
>