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hw/sd/sdhci: Stop multiple transfers when block count is cleared 

Clearing BlockCount stops multiple transfers.

See "SD Host Controller Simplified Specification Version 2.00":

- 2.2.3. Block Count Register (Offset 006h)
- Table 2-8 : Determination of Transfer Type

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20200903172806.489710-2-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-09-03 18:05:41 +02:00
parent dfba99f17f
commit 6a9e5cc61c
1 changed files with 6 additions and 1 deletions
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7
hw/sd/sdhci.c
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@ -731,6 +731,12 @@ static void sdhci_do_adma(SDHCIState *s)
ADMADescr dscr = {};
int i;
if (s->trnmod & SDHC_TRNS_BLK_CNT_EN && !s->blkcnt) {
/* Stop Multiple Transfer */
sdhci_end_transfer(s);
return;
}
for (i = 0; i < SDHC_ADMA_DESCS_PER_DELAY; ++i) {
s->admaerr &= ~SDHC_ADMAERR_LENGTH_MISMATCH;
@ -756,7 +762,6 @@ static void sdhci_do_adma(SDHCIState *s)
switch (dscr.attr & SDHC_ADMA_ATTR_ACT_MASK) {
case SDHC_ADMA_ATTR_ACT_TRAN: /* data transfer */
if (s->trnmod & SDHC_TRNS_READ) {
while (length) {
if (s->data_count == 0) {