diff options
| author | Ludovic Barre <ludovic.barre@st.com> | 2018-10-08 14:08:49 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-09 09:13:04 +0200 |
| commit | b79220b3e0af5037b2ae90a5d2c32bc1a1e627fb (patch) | |
| tree | edb3d648868d3841cce4aa4ffd4988f246c30453 /drivers/mmc/host/mmci.c | |
| parent | d2141547f594d396f85010ba0b37d0e9491943b6 (diff) | |
| download | linux-b79220b3e0af5037b2ae90a5d2c32bc1a1e627fb.tar.bz2 | |
mmc: mmci: add variant property to not read datacnt
This patch adds a boolean property to not read datacnt register.
Needed to support the STM32 sdmmc variant. MMCIDATACNT
register should be read only after the data transfer is completed.
When reading after an error event the read data count value may be
different from the real number of data bytes transferred.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index 66aa59f54cd9..760759919f7f 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -1123,8 +1123,12 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data, * can be as much as a FIFO-worth of data ahead. This * matters for FIFO overruns only. */ - remain = readl(host->base + MMCIDATACNT); - success = data->blksz * data->blocks - remain; + if (!host->variant->datacnt_useless) { + remain = readl(host->base + MMCIDATACNT); + success = data->blksz * data->blocks - remain; + } else { + success = 0; + } dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n", status_err, success); |