From 373b0eb64b9c97a14720896dcfdebfa3268b1991 Mon Sep 17 00:00:00 2001 From: Tomoya MORINAGA Date: Tue, 6 Sep 2011 17:16:36 +0900 Subject: [PATCH] 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 Signed-off-by: Grant Likely --- drivers/spi/spi-topcliff-pch.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c index c36d516..6cb2fdb 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); + } } } -- 2.7.4