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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>
This commit is contained in:
Barry Song 2009-11-18 09:43:21 +00:00 committed by Mike Frysinger
parent d3cc71f71a
commit b052fd0a44
1 changed files with 13 additions and 4 deletions
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17
drivers/spi/spi_bfin5xx.c
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@ -101,6 +101,9 @@ struct master_data {
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 @@ static int bfin_spi_suspend(struct platform_device *pdev, pm_message_t state)
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 @@ static int bfin_spi_resume(struct platform_device *pdev)
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);