[Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't boot anymore

[Christophe Leroy]

Le 13/02/2020 à 04:35, Qiang Zhao a écrit :
> On 02/12/2020 22:50 PM, Christophe Leroy wrote:
>> -----Original Message-----
>> From: Christophe Leroy <christophe.leroy at c-s.fr>
>> Sent: 2020年2月12日 22:50
>> To: Rasmus Villemoes <linux at rasmusvillemoes.dk>; Leo Li
>> <leoyang.li at nxp.com>; Qiang Zhao <qiang.zhao at nxp.com>; Greg
>> Kroah-Hartman <gregkh at linuxfoundation.org>
>> Cc: Scott Wood <oss at buserror.net>; linuxppc-dev at lists.ozlabs.org; LKML
>> <linux-kernel at vger.kernel.org>; linux-arm-kernel at lists.infradead.org
>> Subject: Re: [Regression 5.6-rc1][Bisected b6231ea2b3c6] Powerpc 8xx doesn't
>> boot anymore
>>
>> ---
>> diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
>> b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
>> index 4cabded8390b..341d682ec6eb 100644
>> --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
>> +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
>> @@ -1351,6 +1351,7 @@ static int __init cpm_uart_console_setup(struct
>> console *co, char *options)
>>    		clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR |
>> SCC_GSMRL_ENT);
>>    	}
>>
>> +	cpm_muram_init();
>>    	ret = cpm_uart_allocbuf(pinfo, 1);
>>
>>    	if (ret)
>>
> How about the patch like below? Just a draft.

Yes, I see the idea. I think we could go for something like that.
But in the powerpc 8xx case, we are talking about cpm_init(), not qe_init().

And maybe the return code should be checked, because if it's not 0, 
cpm_muram_init() won't have been called.

Thanks,
Christophe