diff mbox

usb: host: xhci-plat: Make enum xhci_plat_type start at a non zero value

Message ID 87io0a8nbd.fsf@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Felipe Balbi March 25, 2016, 5:44 p.m. UTC
Hi,

Gregory CLEMENT <gregory.clement@free-electrons.com> writes:
>> Peter Griffin <peter.griffin@linaro.org> writes:
>>> Otherwise generic-xhci and xhci-platform which have no data get wrongly
>>> detected as XHCI_PLAT_TYPE_MARVELL_ARMADA by xhci_plat_type_is().
>>>
>>> This fixes a regression in v4.5 for STiH407 family SoC's which use the
>>> synopsis dwc3 IP, whereby the disable_clk error path gets taken due to
>>> wrongly being detected as XHCI_PLAT_TYPE_MARVELL_ARMADA and the hcd never
>>> gets added.
>>>
>>> I suspect this will also fix other dwc3 DT platforms such as Exynos,
>>> although I've only tested on STih410 SoC.
>>>
>>> Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
>>> Cc: stable@vger.kernel.org
>>> Cc: gregory.clement@free-electrons.com
>>> Cc: yoshihiro.shimoda.uh@renesas.com
>>> Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
>>> ---
>>>  drivers/usb/host/xhci-plat.h | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
>>> index 5a2e2e3..529c3c4 100644
>>> --- a/drivers/usb/host/xhci-plat.h
>>> +++ b/drivers/usb/host/xhci-plat.h
>>> @@ -14,7 +14,7 @@
>>>  #include "xhci.h"	/* for hcd_to_xhci() */
>>>  
>>>  enum xhci_plat_type {
>>> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
>>> +	XHCI_PLAT_TYPE_MARVELL_ARMADA = 1,
>>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>>
>> aren't these platforms using device tree ? Why aren't these just
>> different compatible strings ?
>
> According to 4efb2f69411456d35051e9047c15157c9a5ba217 "usb: host:
> xhci-plat: add struct xhci_plat_priv" :
>
> This patch adds struct xhci_plat_priv to simplify the code to match
> platform specific variables. For now, this patch adds a member "type" in
> the structure

that's fine but the answer doesn't exactly match my question ;-)

My point is that this enum shouldn't be necessary at all. We have
compatible flags to make these checks instead. How about below ?
(untested, uncompiled, yada yada yada). Note that we DON'T need this
xhci_plat_type trickery, just need to be a little bit smarter about how
we use driver_data:


ps: there might be bugs there, but it's a holiday and I really shouldn't
be spending time on this right now ;-)

Anyway, have fun testing. Let me know if it doesn't work.

Comments

Peter Griffin March 26, 2016, 9:10 a.m. UTC | #1
Hi Felipe,

On Fri, 25 Mar 2016, Felipe Balbi wrote:

> 
> Hi,
> 
> Gregory CLEMENT <gregory.clement@free-electrons.com> writes:
> >> Peter Griffin <peter.griffin@linaro.org> writes:
> >>> Otherwise generic-xhci and xhci-platform which have no data get wrongly
> >>> detected as XHCI_PLAT_TYPE_MARVELL_ARMADA by xhci_plat_type_is().
> >>>
> >>> This fixes a regression in v4.5 for STiH407 family SoC's which use the
> >>> synopsis dwc3 IP, whereby the disable_clk error path gets taken due to
> >>> wrongly being detected as XHCI_PLAT_TYPE_MARVELL_ARMADA and the hcd never
> >>> gets added.
> >>>
> >>> I suspect this will also fix other dwc3 DT platforms such as Exynos,
> >>> although I've only tested on STih410 SoC.
> >>>
> >>> Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
> >>> Cc: stable@vger.kernel.org
> >>> Cc: gregory.clement@free-electrons.com
> >>> Cc: yoshihiro.shimoda.uh@renesas.com
> >>> Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
> >>> ---
> >>>  drivers/usb/host/xhci-plat.h | 2 +-
> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
> >>> index 5a2e2e3..529c3c4 100644
> >>> --- a/drivers/usb/host/xhci-plat.h
> >>> +++ b/drivers/usb/host/xhci-plat.h
> >>> @@ -14,7 +14,7 @@
> >>>  #include "xhci.h"	/* for hcd_to_xhci() */
> >>>  
> >>>  enum xhci_plat_type {
> >>> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
> >>> +	XHCI_PLAT_TYPE_MARVELL_ARMADA = 1,
> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
> >>
> >> aren't these platforms using device tree ? Why aren't these just
> >> different compatible strings ?
> >
> > According to 4efb2f69411456d35051e9047c15157c9a5ba217 "usb: host:
> > xhci-plat: add struct xhci_plat_priv" :
> >
> > This patch adds struct xhci_plat_priv to simplify the code to match
> > platform specific variables. For now, this patch adds a member "type" in
> > the structure
> 
> that's fine but the answer doesn't exactly match my question ;-)
> 
> My point is that this enum shouldn't be necessary at all. We have
> compatible flags to make these checks instead. How about below ?
> (untested, uncompiled, yada yada yada). Note that we DON'T need this
> xhci_plat_type trickery, just need to be a little bit smarter about how
> we use driver_data:

Your solution certainly looks more elegant.

> 
> diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
> index 1eefc988192d..1ea6c18b74f3 100644
> --- a/drivers/usb/host/xhci-mvebu.c
> +++ b/drivers/usb/host/xhci-mvebu.c
> @@ -41,8 +41,9 @@ static void xhci_mvebu_mbus_config(void __iomem *base,
>  	}
>  }
>  
> -int xhci_mvebu_mbus_init_quirk(struct platform_device *pdev)
> +int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
>  {
> +	struct platform_device *pdev = to_platform_device(hcd->self.controller);
>  	struct resource	*res;
>  	void __iomem *base;
>  	const struct mbus_dram_target_info *dram;
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 5c15e9bc5f7a..adb77c60a9ae 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -47,43 +47,56 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
>  	xhci->quirks |= XHCI_PLAT;
>  }
>  
> +static void xhci_priv_plat_start(struct usb_hcd *hcd)
> +{
> +	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
> +
> +	if (priv->plat_start)
> +		priv->plat_start(hcd);
> +}
> +
> +static int xhci_priv_init_quirk(struct usb_hcd *hcd)
> +{
> +	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
> +
> +	if (!priv->init_quirk)
> +		return 0;
> +
> +	return priv->init_quirk(hcd);
> +}
> +
>  /* called during probe() after chip reset completes */
>  static int xhci_plat_setup(struct usb_hcd *hcd)
>  {
>  	int ret;
>  
> -	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
> -	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3)) {
> -		ret = xhci_rcar_init_quirk(hcd);
> -		if (ret)
> -			return ret;
> -	}
> +	ret = xhci_priv_init_quirk(hcd);
> +	if (ret)
> +		return ret;
>  
>  	return xhci_gen_setup(hcd, xhci_plat_quirks);
>  }
>  
>  static int xhci_plat_start(struct usb_hcd *hcd)
>  {
> -	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
> -	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
> -		xhci_rcar_start(hcd);
> -
> +	xhci_priv_plat_start(hcd);
>  	return xhci_run(hcd);
>  }
>  
>  #ifdef CONFIG_OF
>  static const struct xhci_plat_priv xhci_plat_marvell_armada = {
> -	.type = XHCI_PLAT_TYPE_MARVELL_ARMADA,
> +	.init_quirk = xhci_mvebu_mbus_init_quirk,
>  };
>  
>  static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
> -	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>  	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
> +	.init_quirk = xhci_rcar_init_quirk,
>  };
>  
>  static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
> -	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>  	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
> +	.init_quirk = xhci_rcar_init_quirk,
> +	.plat_start = xhci_rcar_start,
>  };
>  
>  static const struct of_device_id usb_xhci_of_match[] = {
> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
> index 5a2e2e3936c4..c4d565980832 100644
> --- a/drivers/usb/host/xhci-plat.h
> +++ b/drivers/usb/host/xhci-plat.h
> @@ -13,27 +13,13 @@
>  
>  #include "xhci.h"	/* for hcd_to_xhci() */
>  
> -enum xhci_plat_type {
> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
> -	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
> -	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
> -};
> -
>  struct xhci_plat_priv {
>  	enum xhci_plat_type type;
>  	const char *firmware_name;
> +	void (*plat_start)(struct usb_hcd *);
> +	int (*init_quirk)(struct usb_hcd *);
>  };
>  
>  #define hcd_to_xhci_priv(h) ((struct xhci_plat_priv *)hcd_to_xhci(h)->priv)
>  
> -static inline bool xhci_plat_type_is(struct usb_hcd *hcd,
> -				     enum xhci_plat_type type)
> -{
> -	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
> -
> -	if (priv && priv->type == type)
> -		return true;
> -	else
> -		return false;
> -}
>  #endif	/* _XHCI_PLAT_H */
> 
> ps: there might be bugs there, but it's a holiday and I really shouldn't
> be spending time on this right now ;-)

I'm also off on holiday now until Sunday 10th April... yay :-)
> 
> Anyway, have fun testing. Let me know if it doesn't work.

I only have access to STi platforms which were broken by this change.
Not any of the platforms which rely on the functionality which
was introduced (although I can't see any reason why your patch wouldn't work).

Maybe Yoshihiro (on CC) could test this on the Renesas platforms and confirm?

regards,

Peter.
Felipe Balbi March 26, 2016, 10:10 a.m. UTC | #2
Hi,

Peter Griffin <peter.griffin@linaro.org> writes:
> Hi Felipe,
>
> On Fri, 25 Mar 2016, Felipe Balbi wrote:
>
>> 
>> Hi,
>> 
>> Gregory CLEMENT <gregory.clement@free-electrons.com> writes:
>> >> Peter Griffin <peter.griffin@linaro.org> writes:
>> >>> Otherwise generic-xhci and xhci-platform which have no data get wrongly
>> >>> detected as XHCI_PLAT_TYPE_MARVELL_ARMADA by xhci_plat_type_is().
>> >>>
>> >>> This fixes a regression in v4.5 for STiH407 family SoC's which use the
>> >>> synopsis dwc3 IP, whereby the disable_clk error path gets taken due to
>> >>> wrongly being detected as XHCI_PLAT_TYPE_MARVELL_ARMADA and the hcd never
>> >>> gets added.
>> >>>
>> >>> I suspect this will also fix other dwc3 DT platforms such as Exynos,
>> >>> although I've only tested on STih410 SoC.
>> >>>
>> >>> Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
>> >>> Cc: stable@vger.kernel.org
>> >>> Cc: gregory.clement@free-electrons.com
>> >>> Cc: yoshihiro.shimoda.uh@renesas.com
>> >>> Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
>> >>> ---
>> >>>  drivers/usb/host/xhci-plat.h | 2 +-
>> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> >>>
>> >>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
>> >>> index 5a2e2e3..529c3c4 100644
>> >>> --- a/drivers/usb/host/xhci-plat.h
>> >>> +++ b/drivers/usb/host/xhci-plat.h
>> >>> @@ -14,7 +14,7 @@
>> >>>  #include "xhci.h"	/* for hcd_to_xhci() */
>> >>>  
>> >>>  enum xhci_plat_type {
>> >>> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
>> >>> +	XHCI_PLAT_TYPE_MARVELL_ARMADA = 1,
>> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>> >>
>> >> aren't these platforms using device tree ? Why aren't these just
>> >> different compatible strings ?
>> >
>> > According to 4efb2f69411456d35051e9047c15157c9a5ba217 "usb: host:
>> > xhci-plat: add struct xhci_plat_priv" :
>> >
>> > This patch adds struct xhci_plat_priv to simplify the code to match
>> > platform specific variables. For now, this patch adds a member "type" in
>> > the structure
>> 
>> that's fine but the answer doesn't exactly match my question ;-)
>> 
>> My point is that this enum shouldn't be necessary at all. We have
>> compatible flags to make these checks instead. How about below ?
>> (untested, uncompiled, yada yada yada). Note that we DON'T need this
>> xhci_plat_type trickery, just need to be a little bit smarter about how
>> we use driver_data:
>
> Your solution certainly looks more elegant.

cool thanks. Now that I think about this more carefully, we might wanna
take $subject anyway for the -rc and get my version applied for v4.7
merge window. What do you think ?

>> diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
>> index 1eefc988192d..1ea6c18b74f3 100644
>> --- a/drivers/usb/host/xhci-mvebu.c
>> +++ b/drivers/usb/host/xhci-mvebu.c
>> @@ -41,8 +41,9 @@ static void xhci_mvebu_mbus_config(void __iomem *base,
>>  	}
>>  }
>>  
>> -int xhci_mvebu_mbus_init_quirk(struct platform_device *pdev)
>> +int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
>>  {
>> +	struct platform_device *pdev = to_platform_device(hcd->self.controller);
>>  	struct resource	*res;
>>  	void __iomem *base;
>>  	const struct mbus_dram_target_info *dram;
>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>> index 5c15e9bc5f7a..adb77c60a9ae 100644
>> --- a/drivers/usb/host/xhci-plat.c
>> +++ b/drivers/usb/host/xhci-plat.c
>> @@ -47,43 +47,56 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
>>  	xhci->quirks |= XHCI_PLAT;
>>  }
>>  
>> +static void xhci_priv_plat_start(struct usb_hcd *hcd)
>> +{
>> +	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
>> +
>> +	if (priv->plat_start)
>> +		priv->plat_start(hcd);
>> +}
>> +
>> +static int xhci_priv_init_quirk(struct usb_hcd *hcd)
>> +{
>> +	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
>> +
>> +	if (!priv->init_quirk)
>> +		return 0;
>> +
>> +	return priv->init_quirk(hcd);
>> +}
>> +
>>  /* called during probe() after chip reset completes */
>>  static int xhci_plat_setup(struct usb_hcd *hcd)
>>  {
>>  	int ret;
>>  
>> -	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
>> -	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3)) {
>> -		ret = xhci_rcar_init_quirk(hcd);
>> -		if (ret)
>> -			return ret;
>> -	}
>> +	ret = xhci_priv_init_quirk(hcd);
>> +	if (ret)
>> +		return ret;
>>  
>>  	return xhci_gen_setup(hcd, xhci_plat_quirks);
>>  }
>>  
>>  static int xhci_plat_start(struct usb_hcd *hcd)
>>  {
>> -	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
>> -	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
>> -		xhci_rcar_start(hcd);
>> -
>> +	xhci_priv_plat_start(hcd);
>>  	return xhci_run(hcd);
>>  }
>>  
>>  #ifdef CONFIG_OF
>>  static const struct xhci_plat_priv xhci_plat_marvell_armada = {
>> -	.type = XHCI_PLAT_TYPE_MARVELL_ARMADA,
>> +	.init_quirk = xhci_mvebu_mbus_init_quirk,
>>  };
>>  
>>  static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
>> -	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>>  	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
>> +	.init_quirk = xhci_rcar_init_quirk,
>>  };
>>  
>>  static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
>> -	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>>  	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
>> +	.init_quirk = xhci_rcar_init_quirk,
>> +	.plat_start = xhci_rcar_start,
>>  };
>>  
>>  static const struct of_device_id usb_xhci_of_match[] = {
>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
>> index 5a2e2e3936c4..c4d565980832 100644
>> --- a/drivers/usb/host/xhci-plat.h
>> +++ b/drivers/usb/host/xhci-plat.h
>> @@ -13,27 +13,13 @@
>>  
>>  #include "xhci.h"	/* for hcd_to_xhci() */
>>  
>> -enum xhci_plat_type {
>> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
>> -	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
>> -	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
>> -};
>> -
>>  struct xhci_plat_priv {
>>  	enum xhci_plat_type type;
>>  	const char *firmware_name;
>> +	void (*plat_start)(struct usb_hcd *);
>> +	int (*init_quirk)(struct usb_hcd *);
>>  };
>>  
>>  #define hcd_to_xhci_priv(h) ((struct xhci_plat_priv *)hcd_to_xhci(h)->priv)
>>  
>> -static inline bool xhci_plat_type_is(struct usb_hcd *hcd,
>> -				     enum xhci_plat_type type)
>> -{
>> -	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
>> -
>> -	if (priv && priv->type == type)
>> -		return true;
>> -	else
>> -		return false;
>> -}
>>  #endif	/* _XHCI_PLAT_H */
>> 
>> ps: there might be bugs there, but it's a holiday and I really shouldn't
>> be spending time on this right now ;-)
>
> I'm also off on holiday now until Sunday 10th April... yay :-)

heh, cool :-)

>> Anyway, have fun testing. Let me know if it doesn't work.
>
> I only have access to STi platforms which were broken by this change.
> Not any of the platforms which rely on the functionality which
> was introduced (although I can't see any reason why your patch wouldn't work).
>
> Maybe Yoshihiro (on CC) could test this on the Renesas platforms and
> confirm?

sure, that would be great; then we avoid further regressions ;-)
Lee Jones March 29, 2016, 9:04 a.m. UTC | #3
On Sat, 26 Mar 2016, Felipe Balbi wrote:
> Peter Griffin <peter.griffin@linaro.org> writes:
> > On Fri, 25 Mar 2016, Felipe Balbi wrote:
> >> Gregory CLEMENT <gregory.clement@free-electrons.com> writes:
> >> >> Peter Griffin <peter.griffin@linaro.org> writes:
> >> >>> Otherwise generic-xhci and xhci-platform which have no data get wrongly
> >> >>> detected as XHCI_PLAT_TYPE_MARVELL_ARMADA by xhci_plat_type_is().
> >> >>>
> >> >>> This fixes a regression in v4.5 for STiH407 family SoC's which use the
> >> >>> synopsis dwc3 IP, whereby the disable_clk error path gets taken due to
> >> >>> wrongly being detected as XHCI_PLAT_TYPE_MARVELL_ARMADA and the hcd never
> >> >>> gets added.
> >> >>>
> >> >>> I suspect this will also fix other dwc3 DT platforms such as Exynos,
> >> >>> although I've only tested on STih410 SoC.
> >> >>>
> >> >>> Fixes: 4efb2f694114 ("usb: host: xhci-plat: add struct xhci_plat_priv")
> >> >>> Cc: stable@vger.kernel.org
> >> >>> Cc: gregory.clement@free-electrons.com
> >> >>> Cc: yoshihiro.shimoda.uh@renesas.com
> >> >>> Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
> >> >>> ---
> >> >>>  drivers/usb/host/xhci-plat.h | 2 +-
> >> >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >> >>>
> >> >>> diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
> >> >>> index 5a2e2e3..529c3c4 100644
> >> >>> --- a/drivers/usb/host/xhci-plat.h
> >> >>> +++ b/drivers/usb/host/xhci-plat.h
> >> >>> @@ -14,7 +14,7 @@
> >> >>>  #include "xhci.h"	/* for hcd_to_xhci() */
> >> >>>  
> >> >>>  enum xhci_plat_type {
> >> >>> -	XHCI_PLAT_TYPE_MARVELL_ARMADA,
> >> >>> +	XHCI_PLAT_TYPE_MARVELL_ARMADA = 1,
> >> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
> >> >>>  	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
> >> >>
> >> >> aren't these platforms using device tree ? Why aren't these just
> >> >> different compatible strings ?
> >> >
> >> > According to 4efb2f69411456d35051e9047c15157c9a5ba217 "usb: host:
> >> > xhci-plat: add struct xhci_plat_priv" :
> >> >
> >> > This patch adds struct xhci_plat_priv to simplify the code to match
> >> > platform specific variables. For now, this patch adds a member "type" in
> >> > the structure
> >> 
> >> that's fine but the answer doesn't exactly match my question ;-)
> >> 
> >> My point is that this enum shouldn't be necessary at all. We have
> >> compatible flags to make these checks instead. How about below ?
> >> (untested, uncompiled, yada yada yada). Note that we DON'T need this
> >> xhci_plat_type trickery, just need to be a little bit smarter about how
> >> we use driver_data:
> >
> > Your solution certainly looks more elegant.
> 
> cool thanks. Now that I think about this more carefully, we might wanna
> take $subject anyway for the -rc and get my version applied for v4.7
> merge window. What do you think ?

+1 for a simple/quick fix.

Acked-by: Lee Jones <lee.jones@linaro.org>
diff mbox

Patch

diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
index 1eefc988192d..1ea6c18b74f3 100644
--- a/drivers/usb/host/xhci-mvebu.c
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -41,8 +41,9 @@  static void xhci_mvebu_mbus_config(void __iomem *base,
 	}
 }
 
-int xhci_mvebu_mbus_init_quirk(struct platform_device *pdev)
+int xhci_mvebu_mbus_init_quirk(struct usb_hcd *hcd)
 {
+	struct platform_device *pdev = to_platform_device(hcd->self.controller);
 	struct resource	*res;
 	void __iomem *base;
 	const struct mbus_dram_target_info *dram;
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 5c15e9bc5f7a..adb77c60a9ae 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -47,43 +47,56 @@  static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
 	xhci->quirks |= XHCI_PLAT;
 }
 
+static void xhci_priv_plat_start(struct usb_hcd *hcd)
+{
+	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+
+	if (priv->plat_start)
+		priv->plat_start(hcd);
+}
+
+static int xhci_priv_init_quirk(struct usb_hcd *hcd)
+{
+	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
+
+	if (!priv->init_quirk)
+		return 0;
+
+	return priv->init_quirk(hcd);
+}
+
 /* called during probe() after chip reset completes */
 static int xhci_plat_setup(struct usb_hcd *hcd)
 {
 	int ret;
 
-	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
-	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3)) {
-		ret = xhci_rcar_init_quirk(hcd);
-		if (ret)
-			return ret;
-	}
+	ret = xhci_priv_init_quirk(hcd);
+	if (ret)
+		return ret;
 
 	return xhci_gen_setup(hcd, xhci_plat_quirks);
 }
 
 static int xhci_plat_start(struct usb_hcd *hcd)
 {
-	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
-	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
-		xhci_rcar_start(hcd);
-
+	xhci_priv_plat_start(hcd);
 	return xhci_run(hcd);
 }
 
 #ifdef CONFIG_OF
 static const struct xhci_plat_priv xhci_plat_marvell_armada = {
-	.type = XHCI_PLAT_TYPE_MARVELL_ARMADA,
+	.init_quirk = xhci_mvebu_mbus_init_quirk,
 };
 
 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
-	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
+	.init_quirk = xhci_rcar_init_quirk,
 };
 
 static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
-	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
+	.init_quirk = xhci_rcar_init_quirk,
+	.plat_start = xhci_rcar_start,
 };
 
 static const struct of_device_id usb_xhci_of_match[] = {
diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
index 5a2e2e3936c4..c4d565980832 100644
--- a/drivers/usb/host/xhci-plat.h
+++ b/drivers/usb/host/xhci-plat.h
@@ -13,27 +13,13 @@ 
 
 #include "xhci.h"	/* for hcd_to_xhci() */
 
-enum xhci_plat_type {
-	XHCI_PLAT_TYPE_MARVELL_ARMADA,
-	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
-	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
-};
-
 struct xhci_plat_priv {
 	enum xhci_plat_type type;
 	const char *firmware_name;
+	void (*plat_start)(struct usb_hcd *);
+	int (*init_quirk)(struct usb_hcd *);
 };
 
 #define hcd_to_xhci_priv(h) ((struct xhci_plat_priv *)hcd_to_xhci(h)->priv)
 
-static inline bool xhci_plat_type_is(struct usb_hcd *hcd,
-				     enum xhci_plat_type type)
-{
-	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
-
-	if (priv && priv->type == type)
-		return true;
-	else
-		return false;
-}
 #endif	/* _XHCI_PLAT_H */