Re: [PATCH 3/5] ARC: handle DSP presence in HW

[Vineet Gupta]

On 1/6/20 5:03 PM, Vineet Gupta wrote:
>
>> +.macro DSP_SAVE_REGFILE_IRQ
>> +#if defined(CONFIG_ARC_DSP_KERNEL)
>> +	/* Drop any changes to DSP_CTRL made by userspace so userspace won't be
>> +	 * able to break kernel */
>> +	mov	r58, DSP_CTRL_DISABLED_ALL
>> +	sr	r58, [ARC_AUX_DSP_CTRL]
>

This also clears the sticky flag DSP_CTRL.SAT, can you check with DSP lib folks if
they rely on this bit in any way whatsoever !