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| author | Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> | 2011-09-06 17:16:36 +0900 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-10-04 10:10:50 -0600 |
| commit | 373b0eb64b9c97a14720896dcfdebfa3268b1991 (patch) | |
| tree | 60fd32435a154920e9c5f3d3630e5ec1e496b88f | |
| parent | 8b7aa961a815dad389525dcd1c36a44c249b1760 (diff) | |
| download | linux-373b0eb64b9c97a14720896dcfdebfa3268b1991.tar.bz2 | |
spi-topcliff-pch: Fix CPU read complete condition issue
We found Rx data sometimes drops.(with non-DMA transfer mode)
The cause is read complete condition is not true.
This patch fixes the issue.
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
| -rw-r--r-- | drivers/spi/spi-topcliff-pch.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index c36d51657066..6cb2fdbe5dba 100644 --- a/drivers/spi/spi-topcliff-pch.c +++ b/drivers/spi/spi-topcliff-pch.c @@ -317,16 +317,19 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, /* if transfer complete interrupt */ if (reg_spsr_val & SPSR_FI_BIT) { - if (tx_index < bpw_len) + if ((tx_index == bpw_len) && (rx_index == tx_index)) { + /* disable interrupts */ + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); + + /* transfer is completed; + inform pch_spi_process_messages */ + data->transfer_complete = true; + data->transfer_active = false; + wake_up(&data->wait); + } else { dev_err(&data->master->dev, "%s : Transfer is not completed", __func__); - /* disable interrupts */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); - - /* transfer is completed;inform pch_spi_process_messages */ - data->transfer_complete = true; - data->transfer_active = false; - wake_up(&data->wait); + } } } |