[PATCH v4 0/2] ?hci-platform: Add support for controllers with more then one reset line

[PATCH v4 0/2] ?hci-platform: Add support for controllers with more then one reset line

[Hans de Goede]

Hi All,

Here is a new version of my patch-set to support usb controllers which
have multiple resets. These patches apply on top of the related
reset-controller patches which have just been merged here:

git://git.pengutronix.de/git/pza/linux.git reset/next

Changes in v2:
-Switch to now shared reset_[de]assert functions

Changes in v3:
-Adjust for changes to shared-reset reset-controller functions

Changes in v4:
-Fix Ugly continuation line
-Add Acked-by: Alan Stern <stern@rowland.harvard.edu>

Regards,

Hans
-

[PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

From: Reinder de Haan <patchesrdh@mveas.com>

At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
reset lines, the controller will not initialize while the reset for
its companion is still asserted, which means we need to de-assert
2 resets for the controller to work.

Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
---
Changes in v2:
-Use the new reset_control_[de]assert_shared reset-controller functions
Changes in v3:
-Adjust for changes to shared-reset reset-controller functions
Changes in v4:
-Fix Ugly continuation line
---
 Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-
 drivers/usb/host/ehci-platform.c                   | 41 ++++++++++++----------
 2 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
index a12d601..0701812 100644
--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
@@ -18,7 +18,7 @@ Optional properties:
  - clocks : a list of phandle + clock specifier pairs
  - phys : phandle + phy specifier pair
  - phy-names : "usb"
- - resets : phandle + reset specifier pair
+ - resets : a list of phandle + reset specifier pairs
 
 Example (Sequoia 440EPx):
     ehci at e0000300 {
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index bd7082f2..5ca749c 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -39,11 +39,12 @@
 
 #define DRIVER_DESC "EHCI generic platform driver"
 #define EHCI_MAX_CLKS 3
+#define EHCI_MAX_RESETS 2
 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
 
 struct ehci_platform_priv {
 	struct clk *clks[EHCI_MAX_CLKS];
-	struct reset_control *rst;
+	struct reset_control *resets[EHCI_MAX_RESETS];
 	struct phy **phys;
 	int num_phys;
 	bool reset_on_resume;
@@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv;
 	struct ehci_hcd *ehci;
-	int err, irq, phy_num, clk = 0;
+	int err, irq, phy_num, clk = 0, rst = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -232,18 +233,22 @@ static int ehci_platform_probe(struct platform_device *dev)
 				break;
 			}
 		}
-	}
 
-	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
-	if (IS_ERR(priv->rst)) {
-		err = PTR_ERR(priv->rst);
-		if (err == -EPROBE_DEFER)
-			goto err_put_clks;
-		priv->rst = NULL;
-	} else {
-		err = reset_control_deassert(priv->rst);
-		if (err)
-			goto err_put_clks;
+		for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
+			priv->resets[rst] =
+				devm_reset_control_get_shared_by_index(
+						&dev->dev, rst);
+			if (IS_ERR(priv->resets[rst])) {
+				err = PTR_ERR(priv->resets[rst]);
+				if (err == -EPROBE_DEFER)
+					goto err_reset;
+				priv->resets[rst] = NULL;
+				break;
+			}
+			err = reset_control_deassert(priv->resets[rst]);
+			if (err)
+				goto err_reset;
+		}
 	}
 
 	if (pdata->big_endian_desc)
@@ -300,8 +305,8 @@ err_power:
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	while (--rst >= 0)
+		reset_control_assert(priv->resets[rst]);
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -319,15 +324,15 @@ static int ehci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
-	int clk;
+	int clk, rst;
 
 	usb_remove_hcd(hcd);
 
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++)
+		reset_control_assert(priv->resets[rst]);
 
 	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);
-- 
2.7.1

[PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Rob Herring]

On Sat, Feb 27, 2016 at 05:58:58PM +0100, Hans de Goede wrote:
> From: Reinder de Haan <patchesrdh@mveas.com>
> 
> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> reset lines, the controller will not initialize while the reset for
> its companion is still asserted, which means we need to de-assert
> 2 resets for the controller to work.
> 
> Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> ---
> Changes in v2:
> -Use the new reset_control_[de]assert_shared reset-controller functions
> Changes in v3:
> -Adjust for changes to shared-reset reset-controller functions
> Changes in v4:
> -Fix Ugly continuation line
> ---
>  Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-

Acked-by: Rob Herring <robh@kernel.org>

>  drivers/usb/host/ehci-platform.c                   | 41 ++++++++++++----------
>  2 files changed, 24 insertions(+), 19 deletions(-)

[PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Greg Kroah-Hartman]

On Sat, Feb 27, 2016 at 05:58:58PM +0100, Hans de Goede wrote:
> From: Reinder de Haan <patchesrdh@mveas.com>
> 
> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> reset lines, the controller will not initialize while the reset for
> its companion is still asserted, which means we need to de-assert
> 2 resets for the controller to work.
> 
> Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> Acked-by: Rob Herring <robh@kernel.org>
> ---
> Changes in v2:
> -Use the new reset_control_[de]assert_shared reset-controller functions
> Changes in v3:
> -Adjust for changes to shared-reset reset-controller functions
> Changes in v4:
> -Fix Ugly continuation line

This breaks the build horribly :(

As does patch 2/2, ugh.

[linux-sunxi] Re: [PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

Hi,

On 04-03-16 05:35, Greg Kroah-Hartman wrote:
> On Sat, Feb 27, 2016 at 05:58:58PM +0100, Hans de Goede wrote:
>> From: Reinder de Haan <patchesrdh@mveas.com>
>>
>> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
>> reset lines, the controller will not initialize while the reset for
>> its companion is still asserted, which means we need to de-assert
>> 2 resets for the controller to work.
>>
>> Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> Acked-by: Alan Stern <stern@rowland.harvard.edu>
>> Acked-by: Rob Herring <robh@kernel.org>
>> ---
>> Changes in v2:
>> -Use the new reset_control_[de]assert_shared reset-controller functions
>> Changes in v3:
>> -Adjust for changes to shared-reset reset-controller functions
>> Changes in v4:
>> -Fix Ugly continuation line
>
> This breaks the build horribly :(
>
> As does patch 2/2, ugh.

As said in the cover letter:

"These patches apply on top of the related
reset-controller patches which have just been merged here:

git://git.pengutronix.de/git/pza/linux.git reset/next"

I guess I should have done s/apply on top of/depend on/
in the above bit. These patches apply fine without those
changes, but indeed they will not build.

You may want to ask Philipp Zabel (added to the To: list)
to create a topic branch for this which you can merge into
your tree.

Regards,

Hans

[linux-sunxi] Re: [PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Greg Kroah-Hartman]

On Fri, Mar 04, 2016 at 08:27:26AM +0100, Hans de Goede wrote:
> Hi,
> 
> On 04-03-16 05:35, Greg Kroah-Hartman wrote:
> >On Sat, Feb 27, 2016 at 05:58:58PM +0100, Hans de Goede wrote:
> >>From: Reinder de Haan <patchesrdh@mveas.com>
> >>
> >>At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> >>reset lines, the controller will not initialize while the reset for
> >>its companion is still asserted, which means we need to de-assert
> >>2 resets for the controller to work.
> >>
> >>Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
> >>Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >>Acked-by: Alan Stern <stern@rowland.harvard.edu>
> >>Acked-by: Rob Herring <robh@kernel.org>
> >>---
> >>Changes in v2:
> >>-Use the new reset_control_[de]assert_shared reset-controller functions
> >>Changes in v3:
> >>-Adjust for changes to shared-reset reset-controller functions
> >>Changes in v4:
> >>-Fix Ugly continuation line
> >
> >This breaks the build horribly :(
> >
> >As does patch 2/2, ugh.
> 
> As said in the cover letter:
> 
> "These patches apply on top of the related
> reset-controller patches which have just been merged here:
> 
> git://git.pengutronix.de/git/pza/linux.git reset/next"
> 
> I guess I should have done s/apply on top of/depend on/
> in the above bit. These patches apply fine without those
> changes, but indeed they will not build.

Then I can't take them, you know this :(

> You may want to ask Philipp Zabel (added to the To: list)
> to create a topic branch for this which you can merge into
> your tree.

If you all want me to do that, fine, otherwise just resend them after
4.6-rc1 is out and the build will not break at that time.

thanks,

greg k-h

[linux-sunxi] Re: [PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

Hi,

On 05-03-16 21:02, Greg Kroah-Hartman wrote:
> On Fri, Mar 04, 2016 at 08:27:26AM +0100, Hans de Goede wrote:
>> Hi,
>>
>> On 04-03-16 05:35, Greg Kroah-Hartman wrote:
>>> On Sat, Feb 27, 2016 at 05:58:58PM +0100, Hans de Goede wrote:
>>>> From: Reinder de Haan <patchesrdh@mveas.com>
>>>>
>>>> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
>>>> reset lines, the controller will not initialize while the reset for
>>>> its companion is still asserted, which means we need to de-assert
>>>> 2 resets for the controller to work.
>>>>
>>>> Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
>>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>>> Acked-by: Alan Stern <stern@rowland.harvard.edu>
>>>> Acked-by: Rob Herring <robh@kernel.org>
>>>> ---
>>>> Changes in v2:
>>>> -Use the new reset_control_[de]assert_shared reset-controller functions
>>>> Changes in v3:
>>>> -Adjust for changes to shared-reset reset-controller functions
>>>> Changes in v4:
>>>> -Fix Ugly continuation line
>>>
>>> This breaks the build horribly :(
>>>
>>> As does patch 2/2, ugh.
>>
>> As said in the cover letter:
>>
>> "These patches apply on top of the related
>> reset-controller patches which have just been merged here:
>>
>> git://git.pengutronix.de/git/pza/linux.git reset/next"
>>
>> I guess I should have done s/apply on top of/depend on/
>> in the above bit. These patches apply fine without those
>> changes, but indeed they will not build.
>
> Then I can't take them, you know this :(
>
>> You may want to ask Philipp Zabel (added to the To: list)
>> to create a topic branch for this which you can merge into
>> your tree.
>
> If you all want me to do that, fine, otherwise just resend them after
> 4.6-rc1 is out and the build will not break at that time.

Ok I will resend these after 4.6-rc1

Regards,

Hans

[PATCH v4 1/2] ehci-platform: Add support for controllers with multiple reset lines

[kbuild test robot]

Hi Reinder,

[auto build test ERROR on robh/for-next]
[also build test ERROR on v4.5-rc6 next-20160304]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/hci-platform-Add-support-for-controllers-with-more-then-one-reset-line/20160228-010130
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux for-next
config: x86_64-randconfig-s5-03060621 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/usb/host/ehci-platform.c: In function 'ehci_platform_probe':
>> drivers/usb/host/ehci-platform.c:239:5: error: implicit declaration of function 'devm_reset_control_get_shared_by_index' [-Werror=implicit-function-declaration]
        devm_reset_control_get_shared_by_index(
        ^
   drivers/usb/host/ehci-platform.c:238:22: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       priv->resets[rst] =
                         ^
   cc1: some warnings being treated as errors

vim +/devm_reset_control_get_shared_by_index +239 drivers/usb/host/ehci-platform.c

   233					break;
   234				}
   235			}
   236	
   237			for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
   238				priv->resets[rst] =
 > 239					devm_reset_control_get_shared_by_index(
   240							&dev->dev, rst);
   241				if (IS_ERR(priv->resets[rst])) {
   242					err = PTR_ERR(priv->resets[rst]);

---
0-DAY kernel test infrastructure                Open Source Technology Center
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[PATCH v4 2/2] ohci-platform: Add support for controllers with multiple reset lines

[Hans de Goede]

At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
reset lines, the controller will not initialize while the reset for
its companion is still asserted, which means we need to de-assert
2 resets for the controller to work.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
---
Changes in v2:
-New patch in v2 of this patch-set, to complement the identical patch for
 the ehci-platform code
Changes in v3:
-Adjust for changes to shared-reset reset-controller functions
Changes in v4:
-Fix Ugly continuation line
---
 Documentation/devicetree/bindings/usb/usb-ohci.txt |  2 +-
 drivers/usb/host/ohci-platform.c                   | 43 ++++++++++++----------
 2 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
index 19233b7..9df4569 100644
--- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
@@ -14,7 +14,7 @@ Optional properties:
 - clocks : a list of phandle + clock specifier pairs
 - phys : phandle + phy specifier pair
 - phy-names : "usb"
-- resets : phandle + reset specifier pair
+- resets : a list of phandle + reset specifier pairs
 
 Example:
 
diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index c2669f18..85f5c9a 100644
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -33,11 +33,12 @@
 
 #define DRIVER_DESC "OHCI generic platform driver"
 #define OHCI_MAX_CLKS 3
+#define OHCI_MAX_RESETS 2
 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
 
 struct ohci_platform_priv {
 	struct clk *clks[OHCI_MAX_CLKS];
-	struct reset_control *rst;
+	struct reset_control *resets[OHCI_MAX_RESETS];
 	struct phy **phys;
 	int num_phys;
 };
@@ -117,7 +118,7 @@ static int ohci_platform_probe(struct platform_device *dev)
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv;
 	struct ohci_hcd *ohci;
-	int err, irq, phy_num, clk = 0;
+	int err, irq, phy_num, clk = 0, rst = 0;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -195,19 +196,21 @@ static int ohci_platform_probe(struct platform_device *dev)
 				break;
 			}
 		}
-
-	}
-
-	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
-	if (IS_ERR(priv->rst)) {
-		err = PTR_ERR(priv->rst);
-		if (err == -EPROBE_DEFER)
-			goto err_put_clks;
-		priv->rst = NULL;
-	} else {
-		err = reset_control_deassert(priv->rst);
-		if (err)
-			goto err_put_clks;
+		for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
+			priv->resets[rst] =
+				devm_reset_control_get_shared_by_index(
+						&dev->dev, rst);
+			if (IS_ERR(priv->resets[rst])) {
+				err = PTR_ERR(priv->resets[rst]);
+				if (err == -EPROBE_DEFER)
+					goto err_reset;
+				priv->resets[rst] = NULL;
+				break;
+			}
+			err = reset_control_deassert(priv->resets[rst]);
+			if (err)
+				goto err_reset;
+		}
 	}
 
 	if (pdata->big_endian_desc)
@@ -265,8 +268,8 @@ err_power:
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	while (--rst >= 0)
+		reset_control_assert(priv->resets[rst]);
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -284,15 +287,15 @@ static int ohci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
-	int clk;
+	int clk, rst;
 
 	usb_remove_hcd(hcd);
 
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	for (rst = 0; rst < OHCI_MAX_RESETS && priv->resets[rst]; rst++)
+		reset_control_assert(priv->resets[rst]);
 
 	for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);
-- 
2.7.1

[PATCH v4 2/2] ohci-platform: Add support for controllers with multiple reset lines

[Rob Herring]

On Sat, Feb 27, 2016 at 05:58:59PM +0100, Hans de Goede wrote:
> At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
> reset lines, the controller will not initialize while the reset for
> its companion is still asserted, which means we need to de-assert
> 2 resets for the controller to work.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> ---
> Changes in v2:
> -New patch in v2 of this patch-set, to complement the identical patch for
>  the ehci-platform code
> Changes in v3:
> -Adjust for changes to shared-reset reset-controller functions
> Changes in v4:
> -Fix Ugly continuation line
> ---
>  Documentation/devicetree/bindings/usb/usb-ohci.txt |  2 +-

Acked-by: Rob Herring <robh@kernel.org>

>  drivers/usb/host/ohci-platform.c                   | 43 ++++++++++++----------
>  2 files changed, 24 insertions(+), 21 deletions(-)

[PATCH v4 2/2] ohci-platform: Add support for controllers with multiple reset lines

[kbuild test robot]

Hi Hans,

[auto build test ERROR on robh/for-next]
[also build test ERROR on v4.5-rc6 next-20160304]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/hci-platform-Add-support-for-controllers-with-more-then-one-reset-line/20160228-010130
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux for-next
config: x86_64-randconfig-s5-03060621 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/usb/host/ohci-platform.c: In function 'ohci_platform_probe':
>> drivers/usb/host/ohci-platform.c:201:5: error: implicit declaration of function 'devm_reset_control_get_shared_by_index' [-Werror=implicit-function-declaration]
        devm_reset_control_get_shared_by_index(
        ^
   drivers/usb/host/ohci-platform.c:200:22: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       priv->resets[rst] =
                         ^
   cc1: some warnings being treated as errors

vim +/devm_reset_control_get_shared_by_index +201 drivers/usb/host/ohci-platform.c

   195					priv->clks[clk] = NULL;
   196					break;
   197				}
   198			}
   199			for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
   200				priv->resets[rst] =
 > 201					devm_reset_control_get_shared_by_index(
   202							&dev->dev, rst);
   203				if (IS_ERR(priv->resets[rst])) {
   204					err = PTR_ERR(priv->resets[rst]);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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