[#6592] PPI hardware/driver often capture corrupt images from image chip(2011)

[#6592] PPI hardware/driver often capture corrupt images from image chip

Submitted By: Marius Kotsbak

Open Date

2011-05-11 05:30:27

Priority:

Medium Assignee:

Scott Jiang

Status:

Open Fixed In Release:

N/A

Found In Release:

2011R1 Release:

Trunk (ec45f5f)

Category:

Drivers Board:

Bluetechnix CM

Processor:

BF537 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Assigned (Not Start)

Uboot version or rev.:

Toolchain version or rev.:

09r1-11

App binary format:

N/A

Summary: PPI hardware/driver often capture corrupt images from image chip

Details:

Often the images captured by the bfin_ppi linux module are corrupted, even if no error (under/overflow) is detected/reported. It seems like some pixels are moved to the previous line.

See the attached image for an example. Note the errors on the right side. The image is supposed to be light in the one quarter in the top left and darker in the rest of it. Clearly the stripe on the right is pixels from the left part.

I am not certain if this is caused by driver error, processor error or something else.

Follow-ups

--- Marius Kotsbak 2011-05-11 05:48:13

The image chip is a Micron MT9P031 and the settings used are:

{ CMD_PPI_SKIPPING, CFG_PPI_SKIP_DISABLE },

{ CMD_PPI_DATALEN, CFG_PPI_DATALEN_8 },

{ CMD_PPI_PACKING, CFG_PPI_PACK_ENABLE },

{ CMD_PPI_CLK_EDGE, CFG_PPI_CLK_EDGE_FALL },

{ CMD_PPI_TRIG_EDGE, CFG_PPI_TRIG_EDGE_RISE },

{ CMD_PPI_XFR_TYPE, CFG_PPI_XFR_TYPE_NON646 },

{ CMD_PPI_PORT_CFG, CFG_PPI_PORT_CFG_XSYNC23 },

{ CMD_PPI_SET_DIMS, CFG_PPI_DIMS_2D },