On Wed, Oct 14, 2015 at 10:07:59AM +0200, Marc Kleine-Budde wrote:
> On 10/14/2015 03:57 AM, Peter Chen wrote:
> > Some i.mx platforms need three clocks to let controller work, but
> > others only need one, refine clock operation to adapt for all
> > platforms, it fixes a regression found at i.mx27.
> >
> > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> > Tested-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
> > Cc: <stable@xxxxxxxxxxxxxxx> #v4.1+
> > ---
> > drivers/usb/chipidea/ci_hdrc_imx.c | 132 ++++++++++++++++++++++++++++++++-----
> > 1 file changed, 114 insertions(+), 18 deletions(-)
> >
> > diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> > index 6ccbf60..82b1dfe 100644
> > --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> > +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> > @@ -84,6 +84,12 @@ struct ci_hdrc_imx_data {
> > struct imx_usbmisc_data *usbmisc_data;
> > bool supports_runtime_pm;
> > bool in_lpm;
> > + /* SoC before i.mx6 (except imx23/imx28) needs three clks */
> > + bool need_three_clks;
> > + struct clk *clk_ipg;
> > + struct clk *clk_ahb;
> > + struct clk *clk_per;
> > + /* --------------------------------- */
> > };
> >
> > /* Common functions shared by usbmisc drivers */
> > @@ -135,6 +141,103 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
> > }
> >
> > /* End of common functions shared by usbmisc drivers*/
> > +static int imx_get_clks(struct device *dev)
> > +{
> > + struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
> > + int ret = 0;
> > +
> > + data->clk_ipg = devm_clk_get(dev, "ipg");
> > + if (IS_ERR(data->clk_ipg)) {
> > + /* If the platform only needs one clocks */
> > + data->clk = devm_clk_get(dev, NULL);
> > + if (IS_ERR(data->clk)) {
> > + ret = PTR_ERR(data->clk);
> > + dev_err(dev,
> > + "Failed to get clock, err=%d\n", ret);
> > + dev_err(dev,
> > + "Failed to get ipg clock, err=%d\n", ret);
>
> Nitpick, one error message should be enough.
Yes, I will show both error value for clk_ipg and NULL.
>
> > + return ret;
> > + }
> > + return ret;
> > + }
> > +
> > + data->clk_ahb = devm_clk_get(dev, "ahb");
> > + if (IS_ERR(data->clk_ahb)) {
> > + ret = PTR_ERR(data->clk_ahb);
> > + dev_err(dev,
> > + "Failed to get ahb clock, err=%d\n", ret);
> > + return ret;
> > + }
> > +
> > + data->clk_per = devm_clk_get(dev, "per");
> > + if (IS_ERR(data->clk_per)) {
> > + ret = PTR_ERR(data->clk_per);
> > + dev_err(dev,
> > + "Failed to get per clock, err=%d\n", ret);
> > + return ret;
> > + }
> > +
> > + data->need_three_clks = true;
> > + return ret;
> > +}
> > +
> > +static int imx_prepare_enable_clks(struct device *dev)
> > +{
> > + struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
> > + int ret = 0;
> > +
> > + if (data->need_three_clks) {
> > + ret = clk_prepare_enable(data->clk_ipg);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed to prepare/enable ipg clk, err=%d\n",
> > + ret);
> > + return ret;
> > + }
> > +
> > + ret = clk_prepare_enable(data->clk_ahb);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed to prepare/enable ahb clk, err=%d\n",
> > + ret);
> > + clk_disable_unprepare(data->clk_ipg);
> > + return ret;
> > + }
> > +
> > + ret = clk_prepare_enable(data->clk_per);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed to prepare/enable per clk, err=%d\n",
> > + ret);
> > + clk_disable_unprepare(data->clk_ahb);
> > + clk_disable_unprepare(data->clk_ipg);
> > + return ret;
> > + }
> > + } else {
> > + ret = clk_prepare_enable(data->clk);
> > + if (ret) {
> > + dev_err(dev,
> > + "Failed to prepare/enable clk, err=%d\n",
> > + ret);
> > + return ret;
> > + }
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static void imx_disable_unprepare_clks(struct device *dev)
> > +{
> > + struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
> > +
> > + if (data->need_three_clks) {
> > + clk_disable_unprepare(data->clk_per);
> > + clk_disable_unprepare(data->clk_ipg);
> > + clk_disable_unprepare(data->clk_ahb);
>
> nit: you enable in this order: ipg, ahb, per. Disabling should be inverse.
Will change, thanks.
>
> > + } else {
> > + clk_disable_unprepare(data->clk);
> > + }
> > +}
--
Best Regards,
Peter Chen
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