linux-kernel - Re: [PATCH 3.18 22/68] ARM: DRA7: hwmod_data: Prevent wait_target_disable error for usb_otg

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Date:   Wed, 21 Mar 2018 12:37:47 +0200
From:   Roger Quadros <rogerq@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     <stable@...r.kernel.org>, Tero Kristo <t-kristo@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: [PATCH 3.18 22/68] ARM: DRA7: hwmod_data: Prevent
 wait_target_disable error for usb_otg_ss

Hi Greg,

On 19/03/18 20:06, Greg Kroah-Hartman wrote:
> 3.18-stable review patch.  If anyone has any objections, please let me know.
> 

Please drop this from 3.18-stable as well. Thanks.


> ------------------
> 
> 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>
> ---
>  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
> @@ -2106,6 +2106,7 @@ 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,
> @@ -2127,6 +2128,7 @@ 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,
> 
> 

-- 
cheers,
-roger

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