linux-kernel - Re: [PATCH 4.4 038/134] ARM: DRA7: hwmod_data: Prevent wait_target_disable error for usb_otg

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Message-ID: <f43909b9-e4d2-2279-9857-1e10a03197c7@ti.com>
Date:   Tue, 20 Mar 2018 07:08:36 +0200
From:   Tero Kristo <t-kristo@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Roger Quadros <rogerq@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: [PATCH 4.4 038/134] ARM: DRA7: hwmod_data: Prevent
 wait_target_disable error for usb_otg_ss

On 20/03/18 01:52, Dan Rue wrote:
> On Mon, Mar 19, 2018 at 07:05:21PM +0100, Greg Kroah-Hartman wrote:
>> 4.4-stable review patch.  If anyone has any objections, please let me know.
>>
>> ------------------
>>
>> From: Roger Quadros <rogerq@...com>
>>
>>
>> [ Upstream commit e2d54fe76997301b49311bde7ba8ef52b47896f9 ]
>>
>> It seems that if L3_INIT clkdomain is kept in HW_AUTO while usb_otg_ss
>> is in use then there are random chances that the usb_otg_ss module
>> will fail to completely idle. i.e. IDLEST = 0x2 instead of 0x3.
>>
>> Preventing L3_INIT from HW_AUTO while usb_otg_ss module is in use
>> fixes this issue.
>>
>> We don't know yet if usb_otg_ss instances 3 and 4 are affected by this
>> issue or not so don't add this flag for those instances.
>>
>> Cc: Tero Kristo <t-kristo@...com>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> Signed-off-by: Tony Lindgren <tony@...mide.com>
>> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> This fails to build for me on arm32 with default config.
> 
> #
> # make -j10 -k -s ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm multi_v7_defconfig
> #
> #
> # make -j10 -k -s ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=build-arm
> #
> ../arch/arm/mach-omap2/omap_hwmod_7xx_data.c:2243:12: error: 'HWMOD_CLKDM_NOAUTO' undeclared here (not in a function)
>    .flags  = HWMOD_CLKDM_NOAUTO,
>              ^
> ../scripts/Makefile.build:269: recipe for target 'arch/arm/mach-omap2/omap_hwmod_7xx_data.o' failed
> make[2]: *** [arch/arm/mach-omap2/omap_hwmod_7xx_data.o] Error 1
> make[2]: Target '__build' not remade because of errors.
> /home/buildslave/workspace/kernel-single-defconfig-builder/defconfig/multi_v7_defconfig/label/builder/Makefile:969: recipe for target 'arch/arm/mach-omap2' failed
> make[1]: *** [arch/arm/mach-omap2] Error 2
> make[1]: Target '_all' not remade because of errors.
> Makefile:152: recipe for target 'sub-make' failed
> make: *** [sub-make] Error 2
> make: Target '_all' not remade because of errors.

This again has some dependencies, at least:

8ff42da41147 ("ARM: OMAP2+ hwmod: Allow modules to disable HW_AUTO")

-Tero

> 
> Dan
> 
>> ---
>>   arch/arm/mach-omap2/omap_hwmod_7xx_data.c |    2 ++
>>   1 file changed, 2 insertions(+)
>>
>> --- a/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
>> +++ b/arch/arm/mach-omap2/omap_hwmod_7xx_data.c
>> @@ -2240,6 +2240,7 @@ static struct omap_hwmod dra7xx_usb_otg_
>>   	.class		= &dra7xx_usb_otg_ss_hwmod_class,
>>   	.clkdm_name	= "l3init_clkdm",
>>   	.main_clk	= "dpll_core_h13x2_ck",
>> +	.flags		= HWMOD_CLKDM_NOAUTO,
>>   	.prcm = {
>>   		.omap4 = {
>>   			.clkctrl_offs = DRA7XX_CM_L3INIT_USB_OTG_SS1_CLKCTRL_OFFSET,
>> @@ -2261,6 +2262,7 @@ static struct omap_hwmod dra7xx_usb_otg_
>>   	.class		= &dra7xx_usb_otg_ss_hwmod_class,
>>   	.clkdm_name	= "l3init_clkdm",
>>   	.main_clk	= "dpll_core_h13x2_ck",
>> +	.flags		= HWMOD_CLKDM_NOAUTO,
>>   	.prcm = {
>>   		.omap4 = {
>>   			.clkctrl_offs = DRA7XX_CM_L3INIT_USB_OTG_SS2_CLKCTRL_OFFSET,
>>
>>

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