linux-kernel - [PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

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Date:	Fri, 12 Aug 2011 10:48:53 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	<spi-devel-general@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

From: Sonic Zhang <sonic.zhang@...log.com>

Poll the FIFO till it is empty before deassert SSEL in pump_transfers in
soft irq mode. No polling is necessary in interrupt mode and error handling.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/spi/spi-bfin5xx.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
index b8d25f2..7e03e7d 100644
--- a/drivers/spi/spi-bfin5xx.c
+++ b/drivers/spi/spi-bfin5xx.c
@@ -587,6 +587,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
 	if (message->state == DONE_STATE) {
 		dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
 		message->status = 0;
+		bfin_spi_flush(drv_data);
 		bfin_spi_giveback(drv_data);
 		return;
 	}
@@ -870,8 +871,10 @@ static void bfin_spi_pump_transfers(unsigned long data)
 		message->actual_length += drv_data->len_in_bytes;
 		/* Move to next transfer of this msg */
 		message->state = bfin_spi_next_transfer(drv_data);
-		if (drv_data->cs_change)
+		if (drv_data->cs_change) {
+			bfin_spi_flush(drv_data);
 			bfin_spi_cs_deactive(drv_data, chip);
+		}
 	}
 
 	/* Schedule next transfer tasklet */
-- 
1.7.0.4


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