spi/bfin_spi: save/restore state when suspending/resuming
We can't rely on the SPI_CTL/SPI_FLG registers retaining their state when
suspending, so save/restore their entire values.
Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 278fe0a..c23ac3b 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -101,6 +101,9 @@
size_t rx_map_len;
size_t tx_map_len;
u8 n_bytes;
+ u16 ctrl_reg;
+ u16 flag_reg;
+
int cs_change;
const struct transfer_ops *ops;
};
@@ -1426,8 +1429,14 @@
if (status != 0)
return status;
- /* stop hardware */
- bfin_spi_disable(drv_data);
+ drv_data->ctrl_reg = read_CTRL(drv_data);
+ drv_data->flag_reg = read_FLAG(drv_data);
+
+ /*
+ * reset SPI_CTL and SPI_FLG registers
+ */
+ write_CTRL(drv_data, BIT_CTL_CPHA | BIT_CTL_MASTER);
+ write_FLAG(drv_data, 0xFF00);
return 0;
}
@@ -1437,8 +1446,8 @@
struct master_data *drv_data = platform_get_drvdata(pdev);
int status = 0;
- /* Enable the SPI interface */
- bfin_spi_enable(drv_data);
+ write_CTRL(drv_data, drv_data->ctrl_reg);
+ write_FLAG(drv_data, drv_data->flag_reg);
/* Start the queue running */
status = bfin_spi_start_queue(drv_data);