Re: [PATCH v2 1/2] drm/exynos: dp: Remove support for unused dptx-phy

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On Wed, Nov 12, 2014 at 9:38 AM, Jingoo Han <jg1.han@xxxxxxxxxxx> wrote:
> On Thursday, October 30, 2014 10:24 PM, 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.
>
> Right, older dptx-phy was replaced long time ago.
> However, it was not removed for DT compatibility.
> I think that now these old DT properties can be removed.
>
> I added some comments below.

Thanks Jingoo for reviewing.

>
>>
>> Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
>> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
>> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
>> ---
>>
>> Changes from V1:
>>  - Reworked error handling in exynos_dp_dt_parse_phydata() as commented
>>    by Inki.
>>
>>  drivers/gpu/drm/exynos/exynos_dp_core.c |   67 ++++++++-----------------------
>>  drivers/gpu/drm/exynos/exynos_dp_core.h |    2 -
>>  2 files changed, 17 insertions(+), 52 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> index cd50ece..206163b 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
>> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> @@ -1052,28 +1052,14 @@ 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)
>> @@ -1212,40 +1198,13 @@ 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)) {
>> +             dev_err(dp->dev, "no DP phy configured\n");
>> +             return PTR_ERR(dp->phy);
>>       }
>>
>> -err:
>> -     of_node_put(dp_phy_node);
>> -
>> -     return ret;
>> +     return 0;
>>  }
>>
>>  static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
>> @@ -1278,8 +1237,16 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>>               return PTR_ERR(dp->video_info);
>>
>>       ret = exynos_dp_dt_parse_phydata(dp);
>
> In your patch, exynos_dp_dt_parse_phydata() calls only devm_phy_get().
> Then, how about calling devm_phy_get() directly and removing
> exynos_dp_dt_parse_phydata()? It looks simpler.

Right, makes sense. Will send quick rework for this.
Then you can give your Reviewed-by. ;-)

[snip]



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

On Wed, Nov 12, 2014 at 9:38 AM, Jingoo Han <jg1.han@xxxxxxxxxxx> wrote:
> On Thursday, October 30, 2014 10:24 PM, 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.
>
> Right, older dptx-phy was replaced long time ago.
> However, it was not removed for DT compatibility.
> I think that now these old DT properties can be removed.
>
> I added some comments below.
>
>>
>> Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
>> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
>> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
>> ---
>>
>> Changes from V1:
>>  - Reworked error handling in exynos_dp_dt_parse_phydata() as commented
>>    by Inki.
>>
>>  drivers/gpu/drm/exynos/exynos_dp_core.c |   67 ++++++++-----------------------
>>  drivers/gpu/drm/exynos/exynos_dp_core.h |    2 -
>>  2 files changed, 17 insertions(+), 52 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> index cd50ece..206163b 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
>> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
>> @@ -1052,28 +1052,14 @@ 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)
>> @@ -1212,40 +1198,13 @@ 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)) {
>> +             dev_err(dp->dev, "no DP phy configured\n");
>> +             return PTR_ERR(dp->phy);
>>       }
>>
>> -err:
>> -     of_node_put(dp_phy_node);
>> -
>> -     return ret;
>> +     return 0;
>>  }
>>
>>  static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
>> @@ -1278,8 +1237,16 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>>               return PTR_ERR(dp->video_info);
>>
>>       ret = exynos_dp_dt_parse_phydata(dp);
>
> In your patch, exynos_dp_dt_parse_phydata() calls only devm_phy_get().
> Then, how about calling devm_phy_get() directly and removing
> exynos_dp_dt_parse_phydata()? It looks simpler.
>
> Best regards,
> Jingoo Han
>
>> -     if (ret)
>> -             return ret;
>> +     if (ret) {
>> +             /*
>> +              * phy itself is not enabled, so we can move forward
>> +              * assigning NULL to phy pointer.
>> +              */
>> +             if (ret == -ENOSYS || ret == -ENODEV)
>> +                     dp->phy = NULL;
>> +             else
>> +                     return ret;
>> +     }
>>
>>       if (!dp->panel) {
>>               ret = exynos_dp_dt_parse_panel(dp);
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
>> index a1aee69..6426201 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp_core.h
>> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
>> @@ -153,8 +153,6 @@ struct exynos_dp_device {
>>       struct clk              *clock;
>>       unsigned int            irq;
>>       void __iomem            *reg_base;
>> -     void __iomem            *phy_addr;
>> -     unsigned int            enable_mask;
>>
>>       struct video_info       *video_info;
>>       struct link_train       link_train;
>> --
>> 1.7.10.4
>
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-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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