Re: [Qemu-devel] [PATCH 0/2] sd: sdhci: correct transfer mode register usage

[Alistair Francis]

On Tue, Feb 7, 2017 at 11:12 AM, P J P <address@hidden> wrote:
> +-- On Tue, 7 Feb 2017, Peter Maydell wrote --+
> | On 31 January 2017 at 12:24, P J P <address@hidden> wrote:
> | > In SDHCI emulation, the 'Block Count Enable' bit of the Transfer Mode
> | > register is used to control 's->blkcnt' value. One, this bit is not
> | > relevant in single block transfers. Second, Transfer Mode register
> | > value could be set such that 's->blkcnt' would not see an update
> | > during multi block transfers. Thus leading to an infinite loop.
> | >
> | > This patch set attempts to correct 'Block Count Enable' bit usage.
> |
> | Edgar, Alistair: the zynq models are our major SDHCI user -- would
> | you like to have a look at this patchset, please?

Yeah, I'll have a look.

>
> I suspect following patch would also be required along with the two in this
> series, not sure.
>
> ===
> diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
> index d921423..7f3d547 100644
> --- a/hw/sd/sdhci.c
> +++ b/hw/sd/sdhci.c
> @@ -1019,7 +1019,11 @@ sdhci_write(void *opaque, hwaddr offset, uint64_t val,
> unsigned size)
>          /* Writing to last byte of sdmasysad might trigger transfer */
>          if (!(mask & 0xFF000000) && TRANSFERRING_DATA(s->prnsts) && s->blkcnt
> &&
>                  s->blksize && SDHC_DMA_TYPE(s->hostctl) == SDHC_CTRL_SDMA) {
> -            sdhci_sdma_transfer_multi_blocks(s);
> +            if (!(s->trnmod & SDHC_TRNS_MULTI)) {
> +                sdhci_sdma_transfer_single_block(s);
> +            } else {
> +                sdhci_sdma_transfer_multi_blocks(s);
> +            }
>          }
>          break;
>      case SDHC_BLKSIZE:
> ===
>
> Could you please have a look this one too?

Sorry I'm confused. Should this be a third patch or is this in a
different series?

Thanks,

Alistair

>
> Thank you.
> --
> Prasad J Pandit / Red Hat Product Security Team
> 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
>