Date: Fri, 8 Oct 2021 07:22:11 GMT From: Michal Meloun <mmel@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: dfb736022285 - main - dwmmc: Calculate the maximum transaction length correctly. Message-ID: <202110080722.1987MB71006597@gitrepo.freebsd.org>
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The branch main has been updated by mmel: URL: https://cgit.FreeBSD.org/src/commit/?id=dfb7360222856e7e4f5e0e5564281a25af63319c commit dfb7360222856e7e4f5e0e5564281a25af63319c Author: Michal Meloun <mmel@FreeBSD.org> AuthorDate: 2021-10-07 18:42:56 +0000 Commit: Michal Meloun <mmel@FreeBSD.org> CommitDate: 2021-10-08 07:21:03 +0000 dwmmc: Calculate the maximum transaction length correctly. We should reserve two descriptors (not MMC_SECTORS) for potentially unaligned (so bounced) buffer fragments, one for the starting fragment and one for the ending fragment. Submitted by: kjopek@gmail.com MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D30387 --- sys/dev/mmc/host/dwmmc.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/sys/dev/mmc/host/dwmmc.c b/sys/dev/mmc/host/dwmmc.c index 77c8e42a6150..2080a973564f 100644 --- a/sys/dev/mmc/host/dwmmc.c +++ b/sys/dev/mmc/host/dwmmc.c @@ -145,6 +145,11 @@ struct idmac_desc { * second half of page */ #define IDMAC_MAX_SIZE 2048 +/* + * Busdma may bounce buffers, so we must reserve 2 descriptors + * (on start and on end) for bounced fragments. + */ +#define DWMMC_MAX_DATA (IDMAC_MAX_SIZE * (IDMAC_DESC_SEGS - 2)) / MMC_SECTOR_SIZE static void dwmmc_next_operation(struct dwmmc_softc *); static int dwmmc_setup_bus(struct dwmmc_softc *, int); @@ -1358,13 +1363,7 @@ dwmmc_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) *(int *)result = sc->host.caps; break; case MMCBR_IVAR_MAX_DATA: - /* - * Busdma may bounce buffers, so we must reserve 2 descriptors - * (on start and on end) for bounced fragments. - * - */ - *(int *)result = (IDMAC_MAX_SIZE * IDMAC_DESC_SEGS) / - MMC_SECTOR_SIZE - 3; + *(int *)result = DWMMC_MAX_DATA; break; case MMCBR_IVAR_TIMING: *(int *)result = sc->host.ios.timing; @@ -1444,7 +1443,7 @@ dwmmc_get_tran_settings(device_t dev, struct ccb_trans_settings_mmc *cts) cts->host_f_min = sc->host.f_min; cts->host_f_max = sc->host.f_max; cts->host_caps = sc->host.caps; - cts->host_max_data = (IDMAC_MAX_SIZE * IDMAC_DESC_SEGS) / MMC_SECTOR_SIZE; + cts->host_max_data = DWMMC_MAX_DATA; memcpy(&cts->ios, &sc->host.ios, sizeof(struct mmc_ios)); return (0);
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