spi: aspeed: Fix window offset of CE1

The offset value of the mapping window in the kernel structure is
calculated using the value of the previous window offset. This doesn't
reflect how the HW is configured and can lead to erroneous setting of
the second flash device (CE1).

Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com> 
Fixes: e3228ed92893 ("spi: spi-mem: Convert Aspeed SMC driver to spi-mem")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 drivers/spi/spi-aspeed-smc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

On Sun, 16 Oct 2022 at 15:57, Cédric Le Goater <clg@kaod.org> wrote:
>
> The offset value of the mapping window in the kernel structure is
> calculated using the value of the previous window offset. This doesn't
> reflect how the HW is configured and can lead to erroneous setting of
> the second flash device (CE1).

So .offset is expected to be the absolute address of the window, and
this was okay for the 2400/2500 but was broken on the 2600?

Reviewed-by: Joel Stanley <joel@jms.id.au>


>
> Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
> Fixes: e3228ed92893 ("spi: spi-mem: Convert Aspeed SMC driver to spi-mem")
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  drivers/spi/spi-aspeed-smc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-aspeed-smc.c b/drivers/spi/spi-aspeed-smc.c
> index 33cefcf18392..b90571396a60 100644
> --- a/drivers/spi/spi-aspeed-smc.c
> +++ b/drivers/spi/spi-aspeed-smc.c
> @@ -398,7 +398,7 @@ static void aspeed_spi_get_windows(struct aspeed_spi *aspi,
>                 windows[cs].cs = cs;
>                 windows[cs].size = data->segment_end(aspi, reg_val) -
>                         data->segment_start(aspi, reg_val);
> -               windows[cs].offset = cs ? windows[cs - 1].offset + windows[cs - 1].size : 0;
> +               windows[cs].offset = data->segment_start(aspi, reg_val) - aspi->ahb_base_phy;
>                 dev_vdbg(aspi->dev, "CE%d offset=0x%.8x size=0x%x\n", cs,
>                          windows[cs].offset, windows[cs].size);
>         }
> --
> 2.37.3
>

On 10/17/22 00:43, Joel Stanley wrote:
> On Sun, 16 Oct 2022 at 15:57, Cédric Le Goater <clg@kaod.org> wrote:
>>
>> The offset value of the mapping window in the kernel structure is
>> calculated using the value of the previous window offset. This doesn't
>> reflect how the HW is configured and can lead to erroneous setting of
>> the second flash device (CE1).
> 
> So .offset is expected to be the absolute address of the window, and
> this was okay for the 2400/2500 but was broken on the 2600?

the aspeed_spi_get_windows() routine collects in an array the window/decoding
range setting for each CS, and the offset for CS1 and above is computed from
the offset/size of the previous CS. But this makes an assumption on the fact
ranges are contiguous, which is not necessarily how the HW is configured.

C.

> Reviewed-by: Joel Stanley <joel@jms.id.au>
> 
> 
>>
>> Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
>> Fixes: e3228ed92893 ("spi: spi-mem: Convert Aspeed SMC driver to spi-mem")
>> Signed-off-by: Cédric Le Goater <clg@kaod.org>
>> ---
>>   drivers/spi/spi-aspeed-smc.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/spi/spi-aspeed-smc.c b/drivers/spi/spi-aspeed-smc.c
>> index 33cefcf18392..b90571396a60 100644
>> --- a/drivers/spi/spi-aspeed-smc.c
>> +++ b/drivers/spi/spi-aspeed-smc.c
>> @@ -398,7 +398,7 @@ static void aspeed_spi_get_windows(struct aspeed_spi *aspi,
>>                  windows[cs].cs = cs;
>>                  windows[cs].size = data->segment_end(aspi, reg_val) -
>>                          data->segment_start(aspi, reg_val);
>> -               windows[cs].offset = cs ? windows[cs - 1].offset + windows[cs - 1].size : 0;
>> +               windows[cs].offset = data->segment_start(aspi, reg_val) - aspi->ahb_base_phy;
>>                  dev_vdbg(aspi->dev, "CE%d offset=0x%.8x size=0x%x\n", cs,
>>                           windows[cs].offset, windows[cs].size);
>>          }
>> --
>> 2.37.3
>>

On Sun, 16 Oct 2022 17:57:22 +0200, Cédric Le Goater wrote:
> The offset value of the mapping window in the kernel structure is
> calculated using the value of the previous window offset. This doesn't
> reflect how the HW is configured and can lead to erroneous setting of
> the second flash device (CE1).
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: aspeed: Fix window offset of CE1
      commit: f8aa6c895d482847c9b799dcdac8bbdb56cb8e04

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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Thanks,
Mark