Hi all,
I am working on with a spi wifi module connected to a a91sam9260 soc,
unsing linux 3.19.
The driver does two transfers in one message and sets cs_change:
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = cmd;
t[0].len = 4;
t[0].cs_change = true;
spi_message_add_tail(&t[0], &m);
/* Busy and non busy words read */
t[1].rx_buf = busy_buf;
t[1].len = WL1271_BUSY_WORD_LEN;
t[1].cs_change = true;
spi_message_add_tail(&t[1], &m);
spi_sync(to_spi_device(glue->dev), &m);
this triggers an error:
[ 4686.320000] ------------[ cut here ]------------
[ 4686.320000] WARNING: CPU: 0 PID: 881 at drivers/spi/spi-atmel.c:1089
atmel_spi_transfer_one_message+0x854/0xb64()
[ 4686.320000] Modules linked in: wlcore_spi wl12xx wlcore mac80211
cfg80211 [last unloaded: wlcore_spi]
[ 4686.320000] CPU: 0 PID: 881 Comm: spi1 Not tainted 3.19.0+ #20
[ 4686.320000] Hardware name: Atmel AT91SAM (Device Tree)
[ 4686.320000] [<c000e3ac>] (unwind_backtrace) from [<c000be70>]
(show_stack+0x10/0x14)
[ 4686.320000] [<c000be70>] (show_stack) from [<c0014c00>]
(warn_slowpath_common+0x80/0xa8)
[ 4686.320000] [<c0014c00>] (warn_slowpath_common) from [<c0014c40>]
(warn_slowpath_null+0x18/0x1c)
[ 4686.320000] [<c0014c40>] (warn_slowpath_null) from [<c01b8dac>]
(atmel_spi_transfer_one_message+0x854/0xb64)
[ 4686.320000] [<c01b8dac>] (atmel_spi_transfer_one_message) from
[<c01b6c04>] (spi_pump_messages+0x3a0/0x3c0)
[ 4686.320000] [<c01b6c04>] (spi_pump_messages) from [<c00284b8>]
(kthread_worker_fn+0xfc/0x110)
[ 4686.320000] [<c00284b8>] (kthread_worker_fn) from [<c002858c>]
(kthread+0xc0/0xd4)
[ 4686.320000] [<c002858c>] (kthread) from [<c0009538>]
(ret_from_fork+0x14/0x3c)
[ 4686.320000] ---[ end trace 358e59d225b0a29d ]---
[ 4686.320000] wl1271_spi spi1.0: spi trasfer timeout, err 0
[ 4686.320000] atmel_spi fffcc000.spi: overrun (0/4 remaining)
If I split this in two messages i dont get this error. Also if i remove
cs_change from first transfer i dont get the error.
Thanks
Jonas Andersson
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