Re: [PATCH] drm/rockchip: analogix_dp: add supports for regulators in edp IP

[Randy Li]

On 10/28/2016 05:11 PM, Shawn Lin wrote:
> On 2016/10/23 3:18, Randy Li wrote:
> > I found if eDP_AVDD_1V0 and eDP_AVDD_1V8 are not been power at
> > RK3288, once trying to enable the pclk clock, the kernel would dead.
> > This patch would try to enable them first. The eDP_AVDD_1V8 more
> > likely to be applied to eDP phy, but I have no time to confirmed
> > it yet.
>
> Comfirm it or at least someone should be able to answer your
> question, Mark?
I just forget to ask the IC department, the TRM didn't cover that.
> Have you considered to add some details about vcc-supply and vccio-
> supply for your analogix_dp-rockchip.txt ?
>
> From your commit msg, these two properties are more likely to be
> required but the code itself tell me them should be optional(from the
> point of backward compatibility, it should also be optinoal).
Yes, I keep it optional for the same reason. Most of boards won't turn 
off those power supply and may use some fixed regulators.
> > Signed-off-by: Randy Li <ayaka@xxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 25
> > +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > index 8548e82..6bf0441 100644
> > --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> > @@ -17,6 +17,7 @@
> >  #include <linux/of_device.h>
> >  #include <linux/of_graph.h>
> >  #include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> >  #include <linux/reset.h>
> >  #include <linux/clk.h>
> >
> > @@ -70,6 +71,7 @@ struct rockchip_dp_device {
> >      struct clk               *grfclk;
> >      struct regmap            *grf;
> >      struct reset_control     *rst;
> > +    struct regulator_bulk_data supplies[2];
> >
> >      struct work_struct     psr_work;
> >      spinlock_t         psr_lock;
> > @@ -146,6 +148,13 @@ static int rockchip_dp_poweron(struct
> > analogix_dp_plat_data *plat_data)
> >
> >      cancel_work_sync(&dp->psr_work);
> >
> > +    ret = regulator_bulk_enable(ARRAY_SIZE(dp->supplies),
> > +            dp->supplies);
> > +    if (ret) {
> > +        dev_err(dp->dev, "failed to enable vdd supply %d\n", ret);
> > +        return ret;
> > +    }
> > +
> >      ret = clk_prepare_enable(dp->pclk);
> >      if (ret < 0) {
> >          dev_err(dp->dev, "failed to enable pclk %d\n", ret);
> > @@ -168,6 +177,9 @@ static int rockchip_dp_powerdown(struct
> > analogix_dp_plat_data *plat_data)
> >
> >      clk_disable_unprepare(dp->pclk);
> >
> > +    regulator_bulk_disable(ARRAY_SIZE(dp->supplies),
> > +            dp->supplies);
> > +
> >      return 0;
> >  }
> >
> > @@ -323,6 +335,19 @@ static int rockchip_dp_init(struct
> > rockchip_dp_device *dp)
> >          return PTR_ERR(dp->rst);
> >      }
> >
> > +    dp->supplies[0].supply = "vcc";
> > +    dp->supplies[1].supply = "vccio";
> > +    ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dp->supplies),
> > +            dp->supplies);
> > +    if (ret < 0) {
> > +        dev_err(dev, "failed to get regulators: %d\n", ret);
> > +    }
> > +    ret = regulator_bulk_enable(ARRAY_SIZE(dp->supplies),
> > +            dp->supplies);
> > +    if (ret < 0) {
> > +        dev_err(dev, "failed to enable regulators: %d\n", ret);
> > +    }
> > +
> >      ret = clk_prepare_enable(dp->pclk);
> >      if (ret < 0) {
> >          dev_err(dp->dev, "failed to enable pclk %d\n", ret);

--
Randy Li
The third produce department
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