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Commit b052fd0a authored by Barry Song's avatar Barry Song Committed by Mike Frysinger
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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: default avatarBarry Song <barry.song@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent d3cc71f7

drivers/spi/spi_bfin5xx.c

+13 −4
Original line number Diff line number Diff line
@@ -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);