[#6677] bfin_sport(2011)

[#6677] bfin_sport

Submitted By: fuxiong jiang

Open Date

2011-07-03 10:18:15

Priority:

Medium Assignee:

Nobody

Status:

Open Fixed In Release:

N/A

Found In Release:

2009R1.1-RC4 Release:

Category:

N/A Board:

N/A

Processor:

BF531 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

2010R1-RC2

App binary format:

N/A

Summary: bfin_sport

Details:

在drivers/char/bfin_sport.c中，sport_write函数，在使能sport DMA的情况下，如果只写入4bytes数据，或者更少的情况下，dma中断会在dev->regs->tcr1 |= TSPEN;执行之前响应，在dma中断函数dma_tx_irq_handler中，会等待sport传输完成，而实际上这会儿sport还没有启动，所以直接导致处理器死机。

Follow-ups

--- Sonic Zhang 2011-07-03 23:55:48

The work around could be use PIO mode only for buffer size <=4.

--- Sonic Zhang 2011-07-03 23:59:46

Or disable IRQ before enable sport in sport_write.

--- Sonic Zhang 2011-07-04 02:46:17

Fixed.

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