Author: andrew
Date: Fri May 13 15:15:54 2016
New Revision: 299679
URL: https://svnweb.freebsd.org/changeset/base/299679
Log:
Add DMA sync operations around accessing the dwmmc descriptor ring. Even
with it maps as cache-coherent we still need to call bus_dmamap_sync.
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/dev/mmc/host/dwmmc.c
Modified: head/sys/dev/mmc/host/dwmmc.c
==============================================================================
--- head/sys/dev/mmc/host/dwmmc.c Fri May 13 15:11:17 2016
(r299678)
+++ head/sys/dev/mmc/host/dwmmc.c Fri May 13 15:15:54 2016
(r299679)
@@ -722,6 +722,9 @@ dma_done(struct dwmmc_softc *sc, struct
bus_dmamap_sync(sc->buf_tag, sc->buf_map,
BUS_DMASYNC_POSTREAD);
+ bus_dmamap_sync(sc->desc_tag, sc->desc_map,
+ BUS_DMASYNC_POSTWRITE);
+
bus_dmamap_unload(sc->buf_tag, sc->buf_map);
return (0);
@@ -766,6 +769,10 @@ dma_prepare(struct dwmmc_softc *sc, stru
if (err != 0)
panic("dmamap_load failed\n");
+ /* Ensure the device can see the desc */
+ bus_dmamap_sync(sc->desc_tag, sc->desc_map,
+ BUS_DMASYNC_PREWRITE);
+
if (data->flags & MMC_DATA_WRITE)
bus_dmamap_sync(sc->buf_tag, sc->buf_map,
BUS_DMASYNC_PREWRITE);
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