Re: [PATCH v2 5/6] hw/sd: sdhci: Limit block size only when SDHC_BLKSIZE register is writable

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 2/18/21 6:09 PM, Philippe Mathieu-Daudé wrote:
> On 2/16/21 4:46 AM, Bin Meng wrote:
>> The codes to limit the maximum block size is only necessary when
>> SDHC_BLKSIZE register is writable.

Per "SD Command Generation":

  The Host Driver should not read the SDMA System Address, Block Size
  and Block Count registers during a data transaction unless the
  transfer is stopped because the value is changing and not stable.
  To prevent destruction of registers using data transfer when issuing
  command, the 32-bit Block Count, Block Size, 16-bit Block Count and
  Transfer Mode registers shall be write protected by the Host
  Controller while Command Inhibit (DAT) is set to 1 in the Present
  State register.

Shouldn't we check for !(s->prnsts & SDHC_DATA_INHIBIT) instead?

>>
>> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
>>
>> ---
>>
>> Changes in v2:
>> - new patch: sdhci: Limit block size only when SDHC_BLKSIZE register is writable
>>
>>  hw/sd/sdhci.c | 14 +++++++-------
>>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>