diff options
| author | Rene Stange <rsta2@o2online.de> | 2020-02-07 14:04:27 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-02-07 14:04:27 +0000 |
| commit | eb87ff05eab2a39bc0fcd8b4ec51433c4e7fbe42 (patch) | |
| tree | 457bc59d7ea9df52e6dcea742add7c02399bc87b | |
| parent | d63d0ec59d87a698de5ed843288f90a23470cf2e (diff) | |
bcm2835_dma: Fix the ylen loop in TD mode
In TD (two dimensions) DMA mode ylen has to be increased by one after
reading it from the TXFR_LEN register, because a value of zero has to
result in one run through of the ylen loop. This has been tested on a
real Raspberry Pi 3 Model B+. In the previous implementation the ylen
loop was not passed at all for a value of zero.
Signed-off-by: Rene Stange <rsta2@o2online.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | hw/dma/bcm2835_dma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/dma/bcm2835_dma.c b/hw/dma/bcm2835_dma.c index 1e458d7fba..667d951a6f 100644 --- a/hw/dma/bcm2835_dma.c +++ b/hw/dma/bcm2835_dma.c @@ -70,14 +70,14 @@ static void bcm2835_dma_update(BCM2835DMAState *s, unsigned c) ch->stride = ldl_le_phys(&s->dma_as, ch->conblk_ad + 16); ch->nextconbk = ldl_le_phys(&s->dma_as, ch->conblk_ad + 20); + ylen = 1; if (ch->ti & BCM2708_DMA_TDMODE) { /* 2D transfer mode */ - ylen = (ch->txfr_len >> 16) & 0x3fff; + ylen += (ch->txfr_len >> 16) & 0x3fff; xlen = ch->txfr_len & 0xffff; dst_stride = ch->stride >> 16; src_stride = ch->stride & 0xffff; } else { - ylen = 1; xlen = ch->txfr_len; dst_stride = 0; src_stride = 0; |