Date: Fri, 13 May 2016 15:15:54 +0000 (UTC) From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r299679 - head/sys/dev/mmc/host Message-ID: <201605131515.u4DFFsst090382@repo.freebsd.org>
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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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