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

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Message-ID: <16dfbe16-eae7-8da9-4108-07e623210d35@rock-chips.com>
Date:   Fri, 28 Oct 2016 17:29:15 +0800
From:   Randy Li <randy.li@...k-chips.com>
To:     Shawn Lin <shawn.lin@...k-chips.com>, Randy Li <ayaka@...lik.info>,
        dri-devel@...ts.freedesktop.org
Cc:     heiko@...ech.de, airlied@...ux.ie, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, mark.yao@...k-chips.com
Subject: Re: [PATCH] drm/rockchip: analogix_dp: add supports for regulators in
 edp IP



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@...lik.info>
>> ---
>>  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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