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Don't do overlapping USB transactions and SD writes. This seems to avoid FS#8663

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17997 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Frank Gevaerts 2008-07-09 19:56:09 +00:00
parent 1acd535587
commit 3f3bb75d6a
1 changed files with 19 additions and 1 deletions
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20
firmware/usbstack/usb_storage.c
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@ -34,6 +34,14 @@
#ifdef USB_STORAGE
/* The SD card driver on Sansa c200 and e200 can cause write corruption,
* often triggered by simultaneous USB activity. This can be largely avoided
* by not overlapping ata_write_sector() with USB transfers. This does reduce
* write performance, so we only do it for the affected DAPs
*/
#if defined(SANSA_C200) || defined(SANSA_E200)
#define SERIALIZE_WRITES
#endif
/* Enable the following define to export only the SD card slot. This
* is useful for USBCV MSC tests, as those are destructive.
* This won't work right if the device doesn't have a card slot.
@ -408,12 +416,15 @@ void usb_storage_transfer_complete(int ep,bool in,int status,int length)
(BUFFER_SIZE/SECTOR_SIZE);
unsigned int next_count = cur_cmd.count -
MIN(cur_cmd.count,BUFFER_SIZE/SECTOR_SIZE);
int next_select = !cur_cmd.data_select;
#ifndef SERIALIZE_WRITES
if(next_count!=0) {
/* Ask the host to send more, to the other buffer */
receive_block_data(cur_cmd.data[!cur_cmd.data_select],
receive_block_data(cur_cmd.data[next_select],
MIN(BUFFER_SIZE,next_count*SECTOR_SIZE));
}
#endif
/* Now write the data that just came in, while the host is
sending the next bit */
@ -429,6 +440,13 @@ void usb_storage_transfer_complete(int ep,bool in,int status,int length)
cur_sense_data.ascq=0;
break;
}
#ifdef SERIALIZE_WRITES
if(next_count!=0) {
/* Ask the host to send more, to the other buffer */
receive_block_data(cur_cmd.data[next_select],
MIN(BUFFER_SIZE,next_count*SECTOR_SIZE));
}
#endif
if(next_count==0) {
send_csw(UMS_STATUS_GOOD);