linux-kernel - Re: [PATCH 2/3] drm/exynos: dp: Remove support for unused dptx-phy

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Message-ID: <CAFp+6iFLo2sRWC6=KhY4XObZjj4D+HOXv1L2fU2GRe1r6gom3A@mail.gmail.com>
Date:	Thu, 30 Oct 2014 18:49:58 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Inki Dae <inki.dae@...sung.com>
Cc:	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sean Paul <seanpaul@...gle.com>, kishon <kishon@...com>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>, "cpgs ." <cpgs@...sung.com>
Subject: Re: [PATCH 2/3] drm/exynos: dp: Remove support for unused dptx-phy

Hi Inki,


On Thu, Oct 30, 2014 at 5:50 PM, Inki Dae <inki.dae@...sung.com> wrote:
>
> Sorry for late. I missed this patch a little bit for long time.

Thanks for reviewing.

>
>
> On 2014년 09월 15일 22:13, Vivek Gautam wrote:
>> Now that we have moved to generic phy based bindings,
>> we don't need to have any code related to older dptx-phy.
>> Nobody is using this dptx-phy anymore, so removing the
>> same.
>>
>> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
>> Cc: Jingoo Han <jg1.han@...sung.com>
>> ---
>>  drivers/gpu/drm/exynos/exynos_dp_core.c |   58 +++++++------------------------
>>  drivers/gpu/drm/exynos/exynos_dp_core.h |    2 --
>>  2 files changed, 13 insertions(+), 47 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> index 4f3c7eb..5ffc1b2 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
>> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> @@ -1050,28 +1050,14 @@ static int exynos_dp_create_connector(struct exynos_drm_display *display,
>>
>>  static void exynos_dp_phy_init(struct exynos_dp_device *dp)
>>  {
>> -     if (dp->phy) {
>> +     if (dp->phy)
>>               phy_power_on(dp->phy);
>> -     } else if (dp->phy_addr) {
>> -             u32 reg;
>> -
>> -             reg = __raw_readl(dp->phy_addr);
>> -             reg |= dp->enable_mask;
>> -             __raw_writel(reg, dp->phy_addr);
>> -     }
>>  }
>>
>>  static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
>>  {
>> -     if (dp->phy) {
>> +     if (dp->phy)
>>               phy_power_off(dp->phy);
>> -     } else if (dp->phy_addr) {
>> -             u32 reg;
>> -
>> -             reg = __raw_readl(dp->phy_addr);
>> -             reg &= ~(dp->enable_mask);
>> -             __raw_writel(reg, dp->phy_addr);
>> -     }
>>  }
>>
>>  static void exynos_dp_poweron(struct exynos_drm_display *display)
>> @@ -1210,39 +1196,21 @@ static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
>>
>>  static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
>>  {
>> -     struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
>> -     u32 phy_base;
>>       int ret = 0;
>>
>> -     dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
>> -     if (!dp_phy_node) {
>> -             dp->phy = devm_phy_get(dp->dev, "dp");
>> -             return PTR_ERR_OR_ZERO(dp->phy);
>> -     }
>> -
>> -     if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
>> -             dev_err(dp->dev, "failed to get reg for dptx-phy\n");
>> -             ret = -EINVAL;
>> -             goto err;
>> -     }
>> -
>> -     if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
>> -                             &dp->enable_mask)) {
>> -             dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
>> -             ret = -EINVAL;
>> -             goto err;
>> -     }
>> -
>> -     dp->phy_addr = ioremap(phy_base, SZ_4);
>> -     if (!dp->phy_addr) {
>> -             dev_err(dp->dev, "failed to ioremap dp-phy\n");
>> -             ret = -ENOMEM;
>> -             goto err;
>> +     dp->phy = devm_phy_get(dp->dev, "dp");
>> +     if (IS_ERR(dp->phy)) {
>> +             ret = PTR_ERR(dp->phy);
>> +             if (ret == -ENOSYS || ret == -ENODEV) {
>> +                     dp->phy = NULL;
>> +             } else if (ret == -EPROBE_DEFER) {
>> +                     return ret;
>> +             } else {
>
> WARNING: else is not generally useful after a break or return
> #146: FILE: drivers/gpu/drm/exynos/exynos_dp_core.c:1208:
> +                       return ret;
> +               } else {
>
> How about just returning ret like below?
>                 if (IS_ERR(dp->phy)) {
>                         dev_err(dp->dev, "no DP phy configured\n");
>                         return PTR_ERR(ret);
>                 }
>
> And then you can handle the error at probe function properly.

Right, point taken. Will post the reworked patch.

[snip]

-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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