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Message-id: <000001cffe2e$5f83fd30$1e8bf790$%han@samsung.com>
Date: Wed, 12 Nov 2014 13:08:53 +0900
From: Jingoo Han <jg1.han@...sung.com>
To: 'Vivek Gautam' <gautam.vivek@...sung.com>
Cc: dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
seanpaul@...gle.com, ajaykumar.rs@...sung.com,
'Inki Dae' <inki.dae@...sung.com>,
'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v2 1/2] drm/exynos: dp: Remove support for unused dptx-phy
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@...sung.com>
> Cc: Inki Dae <inki.dae@...sung.com>
> Cc: Jingoo Han <jg1.han@...sung.com>
> ---
>
> 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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