diff mbox

[RFC,3/5] video: exynos_dsi: Use generic PHY driver

Message ID 1371231951-1969-4-git-send-email-s.nawrocki@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sylwester Nawrocki/Kernel \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics June 14, 2013, 5:45 p.m. UTC 
Use the generic PHY API instead of the platform callback to control
the MIPI DSIM DPHY.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/video/display/source-exynos_dsi.c |   36 +++++++++--------------------
 include/video/exynos_dsi.h                |    5 ----
 2 files changed, 11 insertions(+), 30 deletions(-)

Comments

Tomasz Figa June 16, 2013, 9:15 p.m. UTC | #1 
On Friday 14 of June 2013 19:45:49 Sylwester Nawrocki wrote:
> Use the generic PHY API instead of the platform callback to control
> the MIPI DSIM DPHY.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>  drivers/video/display/source-exynos_dsi.c |   36
> +++++++++-------------------- include/video/exynos_dsi.h               
> |    5 ----
>  2 files changed, 11 insertions(+), 30 deletions(-)

Yes, this is what I was really missing a lot while developing this driver.

Definitely looks good! It's a shame we don't have this driver in mainline 
yet ;) ,

Best regards,
Tomasz

> diff --git a/drivers/video/display/source-exynos_dsi.c
> b/drivers/video/display/source-exynos_dsi.c index 145d57b..dfab790
> 100644
> --- a/drivers/video/display/source-exynos_dsi.c
> +++ b/drivers/video/display/source-exynos_dsi.c
> @@ -24,6 +24,7 @@
>  #include <linux/mm.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
> @@ -219,6 +220,7 @@ struct exynos_dsi {
>  	bool enabled;
> 
>  	struct platform_device *pdev;
> +	struct phy *phy;
>  	struct device *dev;
>  	struct resource *res;
>  	struct clk *pll_clk;
> @@ -816,6 +818,7 @@ again:
> 
>  static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
>  {
> +	static unsigned long j;
>  	struct exynos_dsi_transfer *xfer;
>  	unsigned long flags;
>  	bool start = true;
> @@ -824,7 +827,8 @@ static bool exynos_dsi_transfer_finish(struct
> exynos_dsi *dsi)
> 
>  	if (list_empty(&dsi->transfer_list)) {
>  		spin_unlock_irqrestore(&dsi->transfer_lock, flags);
> -		dev_warn(dsi->dev, "unexpected TX/RX interrupt\n");
> +		if (printk_timed_ratelimit(&j, 500))
> +			dev_warn(dsi->dev, "unexpected TX/RX 
interrupt\n");
>  		return false;
>  	}
> 
> @@ -994,8 +998,7 @@ static int exynos_dsi_enable(struct video_source
> *src) clk_prepare_enable(dsi->bus_clk);
>  	clk_prepare_enable(dsi->pll_clk);
> 
> -	if (dsi->pd->phy_enable)
> -		dsi->pd->phy_enable(dsi->pdev, true);
> +	phy_power_on(dsi->phy);
> 
>  	exynos_dsi_reset(dsi);
>  	exynos_dsi_init_link(dsi);
> @@ -1019,8 +1022,7 @@ static int exynos_dsi_disable(struct video_source
> *src)
> 
>  	exynos_dsi_disable_clock(dsi);
> 
> -	if (dsi->pd->phy_enable)
> -		dsi->pd->phy_enable(dsi->pdev, false);
> +	phy_power_off(dsi->phy);
> 
>  	clk_disable_unprepare(dsi->pll_clk);
>  	clk_disable_unprepare(dsi->bus_clk);
> @@ -1099,12 +1101,6 @@ static const struct dsi_video_source_ops
> exynos_dsi_ops = { * Device Tree
>   */
> 
> -static int (* const of_phy_enables[])(struct platform_device *, bool) =
> { -#ifdef CONFIG_S5P_SETUP_MIPIPHY
> -	[0] = s5p_dsim_phy_enable,
> -#endif
> -};
> -
>  static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
>  						struct platform_device 
*pdev)
>  {
> @@ -1112,7 +1108,6 @@ static struct exynos_dsi_platform_data
> *exynos_dsi_parse_dt( struct exynos_dsi_platform_data *dsi_pd;
>  	struct device *dev = &pdev->dev;
>  	const __be32 *prop_data;
> -	u32 val;
> 
>  	dsi_pd = kzalloc(sizeof(*dsi_pd), GFP_KERNEL);
>  	if (!dsi_pd) {
> @@ -1120,19 +1115,6 @@ static struct exynos_dsi_platform_data
> *exynos_dsi_parse_dt( return NULL;
>  	}
> 
> -	prop_data = of_get_property(node, "samsung,phy-type", NULL);
> -	if (!prop_data) {
> -		dev_err(dev, "failed to get phy-type property\n");
> -		goto err_free_pd;
> -	}
> -
> -	val = be32_to_cpu(*prop_data);
> -	if (val >= ARRAY_SIZE(of_phy_enables) || !of_phy_enables[val]) {
> -		dev_err(dev, "Invalid phy-type %u\n", val);
> -		goto err_free_pd;
> -	}
> -	dsi_pd->phy_enable = of_phy_enables[val];
> -
>  	prop_data = of_get_property(node, "samsung,pll-stable-time", 
NULL);
>  	if (!prop_data) {
>  		dev_err(dev, "failed to get pll-stable-time property\n");
> @@ -1254,6 +1236,10 @@ static int exynos_dsi_probe(struct
> platform_device *pdev) return -ENOMEM;
>  	}
> 
> +	dsi->phy = devm_phy_get(&pdev->dev, "dsim");
> +	if (IS_ERR(dsi->phy))
> +		return PTR_ERR(dsi->phy);
> +
>  	platform_set_drvdata(pdev, dsi);
> 
>  	dsi->irq = platform_get_irq(pdev, 0);
> diff --git a/include/video/exynos_dsi.h b/include/video/exynos_dsi.h
> index 95e1568..5c062c7 100644
> --- a/include/video/exynos_dsi.h
> +++ b/include/video/exynos_dsi.h
> @@ -25,9 +25,6 @@
>   */
>  struct exynos_dsi_platform_data {
>  	unsigned int enabled;
> -
> -	int (*phy_enable)(struct platform_device *pdev, bool on);
> -
>  	unsigned int pll_stable_time;
>  	unsigned long pll_clk_rate;
>  	unsigned long esc_clk_rate;
> @@ -36,6 +33,4 @@ struct exynos_dsi_platform_data {
>  	unsigned short rx_timeout;
>  };
> 
> -int s5p_dsim_phy_enable(struct platform_device *pdev, bool on);
> -
>  #endif /* _EXYNOS_MIPI_DSIM_H */
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Sylwester Nawrocki/Kernel \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics June 19, 2013, 5:10 p.m. UTC | #2 
On 06/16/2013 11:15 PM, Tomasz Figa wrote:
> On Friday 14 of June 2013 19:45:49 Sylwester Nawrocki wrote:
>> > Use the generic PHY API instead of the platform callback to control
>> > the MIPI DSIM DPHY.
>> > 
>> > Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> > Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
>> > ---
>> >  drivers/video/display/source-exynos_dsi.c |   36
>> > +++++++++-------------------- include/video/exynos_dsi.h               
>> > |    5 ----
>> >  2 files changed, 11 insertions(+), 30 deletions(-)
>
> Yes, this is what I was really missing a lot while developing this driver.
> 
> Definitely looks good! It's a shame we don't have this driver in mainline 
> yet ;)

Yes, I should have mentioned in the cover letter this patch depends
on modified version of this [1] patch set of yours. I'll drop this
patch and will update the driver staying in mainline now, but I won't
be able to test it, on a non-dt platform.

I guess even some pre-eliminary display (panel) API would be helpful.
The CDF development seems to have been stalled for some time. I wonder
if we could first have something that works for limited set of devices
and be extending it gradually, rather than living with zero support
for displays on DT based ARM platforms.

[1] http://www.spinics.net/lists/linux-fbdev/msg09689.html

Regards,
Sylwester
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Tomasz Figa June 19, 2013, 5:20 p.m. UTC | #3 
On Wednesday 19 of June 2013 19:10:52 Sylwester Nawrocki wrote:
> On 06/16/2013 11:15 PM, Tomasz Figa wrote:
> > On Friday 14 of June 2013 19:45:49 Sylwester Nawrocki wrote:
> >> > Use the generic PHY API instead of the platform callback to control
> >> > the MIPI DSIM DPHY.
> >> > 
> >> > Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> >> > Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> >> > ---
> >> > 
> >> >  drivers/video/display/source-exynos_dsi.c |   36
> >> > 
> >> > +++++++++-------------------- include/video/exynos_dsi.h
> >> > 
> >> > |    5 ----
> >> >  
> >> >  2 files changed, 11 insertions(+), 30 deletions(-)
> > 
> > Yes, this is what I was really missing a lot while developing this
> > driver.
> > 
> > Definitely looks good! It's a shame we don't have this driver in
> > mainline yet ;)
> 
> Yes, I should have mentioned in the cover letter this patch depends
> on modified version of this [1] patch set of yours. I'll drop this
> patch and will update the driver staying in mainline now, but I won't
> be able to test it, on a non-dt platform.
> 
> I guess even some pre-eliminary display (panel) API would be helpful.
> The CDF development seems to have been stalled for some time. I wonder
> if we could first have something that works for limited set of devices
> and be extending it gradually, rather than living with zero support
> for displays on DT based ARM platforms.

Well, the problem is that once we define a binding for displays, we will 
have to keep support for this binding even if we decide to change 
something.

But as I discussed with Laurent and Alexandre at LinuxCon Japan, we should 
be able to reuse V4L2 bindings for our purposes, so someone just needs to 
code a proof of concept implementation that doesn't necessarily provide 
full functionality yet, but allows to make something work. Probably based 
on already posted RFC versions of CDF.

CCed Laurent and Alexandre, as they might be able to shed even more light 
on this.

Best regards,
Tomasz

> 
> [1] http://www.spinics.net/lists/linux-fbdev/msg09689.html
> 
> Regards,
> Sylwester
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diff mbox

Patch

diff --git a/drivers/video/display/source-exynos_dsi.c b/drivers/video/display/source-exynos_dsi.c
index 145d57b..dfab790 100644
--- a/drivers/video/display/source-exynos_dsi.c
+++ b/drivers/video/display/source-exynos_dsi.c
@@ -24,6 +24,7 @@ 
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
@@ -219,6 +220,7 @@  struct exynos_dsi {
 	bool enabled;
 
 	struct platform_device *pdev;
+	struct phy *phy;
 	struct device *dev;
 	struct resource *res;
 	struct clk *pll_clk;
@@ -816,6 +818,7 @@  again:
 
 static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
 {
+	static unsigned long j;
 	struct exynos_dsi_transfer *xfer;
 	unsigned long flags;
 	bool start = true;
@@ -824,7 +827,8 @@  static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
 
 	if (list_empty(&dsi->transfer_list)) {
 		spin_unlock_irqrestore(&dsi->transfer_lock, flags);
-		dev_warn(dsi->dev, "unexpected TX/RX interrupt\n");
+		if (printk_timed_ratelimit(&j, 500))
+			dev_warn(dsi->dev, "unexpected TX/RX interrupt\n");
 		return false;
 	}
 
@@ -994,8 +998,7 @@  static int exynos_dsi_enable(struct video_source *src)
 	clk_prepare_enable(dsi->bus_clk);
 	clk_prepare_enable(dsi->pll_clk);
 
-	if (dsi->pd->phy_enable)
-		dsi->pd->phy_enable(dsi->pdev, true);
+	phy_power_on(dsi->phy);
 
 	exynos_dsi_reset(dsi);
 	exynos_dsi_init_link(dsi);
@@ -1019,8 +1022,7 @@  static int exynos_dsi_disable(struct video_source *src)
 
 	exynos_dsi_disable_clock(dsi);
 
-	if (dsi->pd->phy_enable)
-		dsi->pd->phy_enable(dsi->pdev, false);
+	phy_power_off(dsi->phy);
 
 	clk_disable_unprepare(dsi->pll_clk);
 	clk_disable_unprepare(dsi->bus_clk);
@@ -1099,12 +1101,6 @@  static const struct dsi_video_source_ops exynos_dsi_ops = {
  * Device Tree
  */
 
-static int (* const of_phy_enables[])(struct platform_device *, bool) = {
-#ifdef CONFIG_S5P_SETUP_MIPIPHY
-	[0] = s5p_dsim_phy_enable,
-#endif
-};
-
 static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
 						struct platform_device *pdev)
 {
@@ -1112,7 +1108,6 @@  static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
 	struct exynos_dsi_platform_data *dsi_pd;
 	struct device *dev = &pdev->dev;
 	const __be32 *prop_data;
-	u32 val;
 
 	dsi_pd = kzalloc(sizeof(*dsi_pd), GFP_KERNEL);
 	if (!dsi_pd) {
@@ -1120,19 +1115,6 @@  static struct exynos_dsi_platform_data *exynos_dsi_parse_dt(
 		return NULL;
 	}
 
-	prop_data = of_get_property(node, "samsung,phy-type", NULL);
-	if (!prop_data) {
-		dev_err(dev, "failed to get phy-type property\n");
-		goto err_free_pd;
-	}
-
-	val = be32_to_cpu(*prop_data);
-	if (val >= ARRAY_SIZE(of_phy_enables) || !of_phy_enables[val]) {
-		dev_err(dev, "Invalid phy-type %u\n", val);
-		goto err_free_pd;
-	}
-	dsi_pd->phy_enable = of_phy_enables[val];
-
 	prop_data = of_get_property(node, "samsung,pll-stable-time", NULL);
 	if (!prop_data) {
 		dev_err(dev, "failed to get pll-stable-time property\n");
@@ -1254,6 +1236,10 @@  static int exynos_dsi_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	dsi->phy = devm_phy_get(&pdev->dev, "dsim");
+	if (IS_ERR(dsi->phy))
+		return PTR_ERR(dsi->phy);
+
 	platform_set_drvdata(pdev, dsi);
 
 	dsi->irq = platform_get_irq(pdev, 0);
diff --git a/include/video/exynos_dsi.h b/include/video/exynos_dsi.h
index 95e1568..5c062c7 100644
--- a/include/video/exynos_dsi.h
+++ b/include/video/exynos_dsi.h
@@ -25,9 +25,6 @@ 
  */
 struct exynos_dsi_platform_data {
 	unsigned int enabled;
-
-	int (*phy_enable)(struct platform_device *pdev, bool on);
-
 	unsigned int pll_stable_time;
 	unsigned long pll_clk_rate;
 	unsigned long esc_clk_rate;
@@ -36,6 +33,4 @@  struct exynos_dsi_platform_data {
 	unsigned short rx_timeout;
 };
 
-int s5p_dsim_phy_enable(struct platform_device *pdev, bool on);
-
 #endif /* _EXYNOS_MIPI_DSIM_H */