linux-kernel - Re: [PATCH v7 2/5] media: sun6i: Add A64 CSI block support

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Date:   Mon, 28 Jan 2019 13:01:54 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-media <linux-media@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com,
        devicetree <devicetree@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v7 2/5] media: sun6i: Add A64 CSI block support

On Fri, Jan 25, 2019 at 9:12 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Thu, Jan 24, 2019 at 11:37:33PM +0530, Jagan Teki wrote:
> > CSI block in Allwinner A64 has similar features as like in H3,
> > but the default CSI_SCLK rate cannot work properly to drive the
> > connected sensor interface.
> >
> > The tested mod cock rate is 300 MHz and BSP vfe media driver is also
> > using the same rate. Unfortunately there is no valid information about
> > clock rate in manual or any other sources except the BSP driver. so more
> > faith on BSP code, because same has tested in mainline.
> >
> > So, add support for A64 CSI block by setting updated mod clock rate.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > index ee882b66a5ea..cd2d33242c17 100644
> > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > @@ -15,6 +15,7 @@
> >  #include <linux/ioctl.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > +#include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/pm_runtime.h>
> >  #include <linux/regmap.h>
> > @@ -154,6 +155,7 @@ bool sun6i_csi_is_format_supported(struct sun6i_csi *csi,
> >  int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable)
> >  {
> >       struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> > +     struct device *dev = sdev->dev;
> >       struct regmap *regmap = sdev->regmap;
> >       int ret;
> >
> > @@ -161,15 +163,20 @@ int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable)
> >               regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> >
> >               clk_disable_unprepare(sdev->clk_ram);
> > +             if (of_device_is_compatible(dev->of_node, "allwinner,sun50i-a64-csi"))
> > +                     clk_rate_exclusive_put(sdev->clk_mod);
> >               clk_disable_unprepare(sdev->clk_mod);
> >               reset_control_assert(sdev->rstc_bus);
> >               return 0;
> >       }
> >
> > +     if (of_device_is_compatible(dev->of_node, "allwinner,sun50i-a64-csi"))
> > +             clk_set_rate_exclusive(sdev->clk_mod, 300000000);
> > +
> >       ret = clk_prepare_enable(sdev->clk_mod);
> >       if (ret) {
> >               dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> > -             return ret;
> > +             goto clk_mod_put;
> >       }
> >
> >       ret = clk_prepare_enable(sdev->clk_ram);
> > @@ -192,6 +199,9 @@ int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable)
> >       clk_disable_unprepare(sdev->clk_ram);
> >  clk_mod_disable:
> >       clk_disable_unprepare(sdev->clk_mod);
> > +clk_mod_put:
> > +     if (of_device_is_compatible(dev->of_node, "allwinner,sun50i-a64-csi"))
> > +             clk_rate_exclusive_put(sdev->clk_mod);
> >       return ret;
>
> The sequence in the error path and in the disable path aren't the same, why?

True, it should be similar sequence, will fix and send next version. thanks!