[#4610] spi_mmc driver working in dma mode may hang the system

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[#4610] spi_mmc driver working in dma mode may hang the system

Submitted By: Yi Li

Open Date

2008-11-05 05:22:46     Close Date

2008-12-01 23:20:29

Priority:

Medium     Assignee:

Yi Li

Status:

Closed     Fixed In Release:

N/A

Found In Release:

N/A     Release:

svn trunk

Category:

N/A     Board:

STAMP

Processor:

BF537     Silicon Revision:

Is this bug repeatable?:

Yes     Resolution:

Out of Date

Uboot version or rev.:

    Toolchain version or rev.:

App binary format:

N/A     

Summary: spi_mmc driver working in dma mode may hang the system

Details:

 

With defaut setting, spi_mmc driver will ask spi controller driver (the spi framework) to enable DMA when transferring messages. However, this may hang the whole system sometime (not always):

 

+modprobe spi_mmc

spi_mmc: configure for card detection

New MMC/SD card found: 495 MB(519569408 bytes)

spi_mmc:

[System hangs here]

 

Using JTAG can see the kernel is still handling interrupts.

 

If disabling dma, everything would be find.

 

Not sure this is caused by SPI/DMA HW bug? But I think we should not enable DMA by default.

 

 

Follow-ups

 

--- Yi Li                                                    2008-12-01 23:20:29

spi_mmc driver is replaced by mmc_spi driver in mainline kernel now. So close

it.

 

 

 

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