[PATCH v3] mtd: spi-nor: Fix the spi_nor_read() when config SPI_STACKED_PARALLEL is enabled

[Marek Vasut]

On 12/24/24 4:34 PM, Abbarapu, Venkatesh wrote:

[...]

>>> @@ -1593,18 +1595,23 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t
>> from, size_t len,
>>>    	}
>>>
>>>    	while (len) {
>>> -		bank = (u32)from / SZ_16M;
>>> -		if (nor->flags & SNOR_F_HAS_PARALLEL)
>>> -			bank /= 2;
>>> -
>>> -		rem_bank_len = SZ_16M * (bank + 1);
>>> -		if (nor->flags & SNOR_F_HAS_PARALLEL)
>>> -			rem_bank_len *= 2;
>>> -		rem_bank_len -= from;
>>> -
>>> +		size_t read_len = len;
>>
>> size_t read_len should be declared at the beginning of this function.
>>
>>>    		offset = from;
>>>
>>> +	if (CONFIG_IS_ENABLED(SPI_STACKED_PARALLEL)) {
>>
>> The indent here needs to be pushed on tab RIGHT -> .
>>
>> Do you need this functionality in SPL ? If so, you might need a matching Kconfig
>> SPL_SPI_STACKED_PARALLEL symbol .
> 
> This functionality is not needed for SPL.

So SPL does use SPI NOR in non-stacked/parallel mode, and U-Boot does 
use it in stacked/parallel mode ? Doesn't that pose a problem ?

[...]

> FLASH_BAR and stacked parallel configuration doesn’t depend on each other.
Is the use of BAR register and stacked/parallel mode mutually exclusive 
or can they be used together ?