提交 8b7aa961 编写于 作者: T Tomoya MORINAGA 提交者: Grant Likely

spi-topcliff-pch: Fix SSN Control issue

During processing 1 command/data series,
SSN should keep LOW.
However, currently, SSN becomes HIGH.
This patch fixes the issue.
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
上级 27504be5
......@@ -58,6 +58,7 @@
#define PCH_SLEEP_TIME 10
#define SSN_LOW 0x02U
#define SSN_HIGH 0x03U
#define SSN_NO_CONTROL 0x00U
#define PCH_MAX_CS 0xFF
#define PCI_DEVICE_ID_GE_SPI 0x8816
......@@ -756,10 +757,6 @@ static void pch_spi_set_ir(struct pch_spi_data *data)
wait_event_interruptible(data->wait, data->transfer_complete);
pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
dev_dbg(&data->master->dev,
"%s:no more control over SSN-writing 0 to SSNXCR.", __func__);
/* clear all interrupts */
pch_spi_writereg(data->master, PCH_SPSR,
pch_spi_readreg(data->master, PCH_SPSR));
......@@ -848,9 +845,6 @@ static void pch_spi_start_transfer(struct pch_spi_data *data)
kfree(dma->sg_rx_p);
spin_lock_irqsave(&data->lock, flags);
pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
dev_dbg(&data->master->dev,
"%s:no more control over SSN-writing 0 to SSNXCR.", __func__);
/* clear fifo threshold, disable interrupts, disable SPI transfer */
pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
......@@ -1167,6 +1161,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
if (data->use_dma)
pch_spi_request_dma(data,
data->current_msg->spi->bits_per_word);
pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
do {
/* If we are already processing a message get the next
transfer structure from the message otherwise retrieve
......@@ -1227,6 +1222,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
} while (data->cur_trans != NULL);
pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
if (data->use_dma)
pch_spi_release_dma(data);
}
......
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