linux-kernel - Re: [PATCH RESEND 0/2] scsi: ufs: hibern8 fixes

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Date:   Fri, 22 Nov 2019 17:14:18 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     sheebab <sheebab@...ence.com>, <alim.akhtar@...sung.com>,
        <avri.altman@....com>, <pedrom.sousa@...opsys.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <stanley.chu@...iatek.com>, <beanhuo@...ron.com>,
        <yuehaibing@...wei.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>
CC:     <rafalc@...ence.com>, <mparab@...ence.com>
Subject: Re: [PATCH RESEND 0/2] scsi: ufs: hibern8 fixes

Hi,

On 19/11/19 12:34 PM, sheebab wrote:
> Hi,
> 
> Resending this patch to include mailing list and miss out patches.
> 
> This patch set contains following patches
> for Cadence UFS controller driver.
> 
> 1. 0001-scsi-ufs-Enable-hibern8-interrupt-only-during-manual.patch
>    This patch is to fix false interrupt assertion during auto hibernation.
>    In this patch, hibern8 interrupt is Disabled during initialization
>    and later the interrupt is Enabled/Disabled during manual hibern8
>    Entry/Exit.
> 2. 0002-scsi-ufs-Update-L4-attributes-on-manual-hibern8-exit.patch
>    This patch is to update L4 attributes during manual hibern8 exit.
>    As per JESD220C spec, L4 attributes will be reset to their reset value 
>    during DME_HIBERNATION_EXIT. This patch will take backup of the L4 
>    parameters before DME_HIBERNATION_ENTER and restores the L4 parameters
>    after DME_HIBERNATION_EXIT
>  

While I don't see flood of hibernate related interrupts anymore, I
occasionally see "Unhandled Interrupt dump"[1] when using rootfs out of
UFS. I haven't be able to find a way to trigger the issue. But seems to
happen randomly while trying to input and execute something from console.


[1]
j7-evm login: root
[   55.300495] cdns-ufshcd 4e84000.ufs: ufshcd_intr: Unhandled interrupt
0x00000000
[   55.307884] host_regs: 00000000: 1587031f 00000000 00000210 00000000
[   55.314217] host_regs: 00000010: 00000000 00000000 00000c96 00000000
[   55.320551] host_regs: 00000020: 00000014 00030e15 00000000 00000000
[   55.326884] host_regs: 00000030: 0000010f 00000001 00000000 80000002
[   55.333217] host_regs: 00000040: 00000000 00000000 00000000 00000000
[   55.339551] host_regs: 00000050: c1ee0000 00000008 00008000 00000000
[   55.345884] host_regs: 00000060: 00000001 ffffffff 00000000 00000000
[   55.352217] host_regs: 00000070: c1ef0000 00000008 00000000 00000000
[   55.358550] host_regs: 00000080: 00000001 00000000 00000000 00000000
[   55.364884] host_regs: 00000090: 00000002 15710000 00000000 00000000

More such occurrence: https://pastebin.ubuntu.com/p/Df4dykkTmB/



> 
> Thanks,
> Sheeba B
> 
> sheebab (2):
>   scsi: ufs: Enable hibern8 interrupt only during manual hibern8 in
>     Cadence UFS.
>   scsi: ufs: Update L4 attributes on manual hibern8 exit in Cadence UFS.
> 
>  drivers/scsi/ufs/cdns-pltfrm.c | 172 +++++++++++++++++++++++++++++++++--
>  1 file changed, 167 insertions(+), 5 deletions(-)
> 

-- 
Regards
Vignesh