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

[P J P <ppandit@redhat.com>]

+-- On Tue, 7 Feb 2017, Peter Maydell wrote --+
| On 31 January 2017 at 12:24, P J P <ppandit@redhat.com> 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?

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?

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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