From eb87ff05eab2a39bc0fcd8b4ec51433c4e7fbe42 Mon Sep 17 00:00:00 2001 From: Rene Stange Date: Fri, 7 Feb 2020 14:04:27 +0000 Subject: [PATCH] bcm2835_dma: Fix the ylen loop in TD mode MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Peter Maydell --- hw/dma/bcm2835_dma.c | 4 ++-- 1 file 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;