linux-kernel - Re: [PATCH] usb: host: xhci-plat: Make enum xhci_plat

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Date:	Fri, 25 Mar 2016 18:07:09 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Felipe Balbi <balbi@...nel.org>
Cc:	Peter Griffin <peter.griffin@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mathias.nyman@...el.com, gregkh@...uxfoundation.org,
	lee.jones@...aro.org, linux-usb@...r.kernel.org,
	maxime.coquelin@...com, patrice.chotard@...com,
	stable@...r.kernel.org, yoshihiro.shimoda.uh@...esas.com
Subject: Re: [PATCH] usb: host: xhci-plat: Make enum xhci_plat_type start at a non zero value

Hi Felipe,
 
 On ven., mars 25 2016, Felipe Balbi <balbi@...nel.org> wrote:

> Hi,
>
> Peter Griffin <peter.griffin@...aro.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@...r.kernel.org
>> Cc: gregory.clement@...e-electrons.com
>> Cc: yoshihiro.shimoda.uh@...esas.com
>> Signed-off-by: Peter Griffin <peter.griffin@...aro.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

Gregory


>
> -- 
> balbi

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com