On Tue, Oct 29, 2013 at 08:33:15PM +0800, Nicolin Chen wrote:
There's a script for SSI missing in current sdma script list. Thus add it. This script would allow SSI use its dual fifo mode to transimit/receive data without occasional hardware underrun/overrun.
This patch also fixed a counting error for total number of scripts.
Look at drivers/dma/imx-sdma.c:
/**
- struct sdma_firmware_header - Layout of the firmware image
- @magic "SDMA"
- @version_major increased whenever layout of struct
- sdma_script_start_addrs
changes.
Can you image why this firmware has a version field? Right, it's because it encodes the layout of struct sdma_script_start_addrs.
As the comment clearly states you have to *increase this field* when you add scripts.
Obviously you missed that, as the firmware on lkml posted recently shows:
00000000: 414d4453 00000001 00000001 0000001c SDMA............
^^^^^^^^ Still '1'
00000010: 00000026 000000b4 0000067a 00000282 &.......z....... 00000020: ffffffff 00000000 ffffffff ffffffff ................ 00000030: ffffffff ffffffff ffffffff ffffffff ................ 00000040: ffffffff ffffffff 00001a6a ffffffff ........j....... 00000050: 000002eb 000018bb ffffffff 00000408 ................ 00000060: ffffffff 000003c0 ffffffff ffffffff ................ 00000070: ffffffff 000002ab ffffffff 0000037b ............{... 00000080: ffffffff ffffffff 0000044c 0000046e ........L...n... 00000090: ffffffff 00001800 ffffffff ffffffff ................ 000000a0: 00000000 00001800 00001862 00001a16 ........b.......
^^^^^^^^^^^^^^^^^ new script addresses introduced
-#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 +#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 37
And no, this is not a bug. It's your firmware header that is buggy.
What you need is:
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 37
You (you as a company, not you as a person) knew that it was me who created this firmware format. So it was absolutely unnecessary to create an incompatible firmware instead of dropping me a short note.
Please add a version check to the driver as necessary and provide a proper firmware.
Sascha