1 Oct
2018
1 Oct
'18
9:41 p.m.
On Mon, 1 Oct 2018 22:34:38 +0200 Boris Brezillon boris.brezillon@bootlin.com wrote:
I'd previously tried readl() based on the same hunch. No change.
I think my snippet above might be misleading. While a delay between readl_relaxed() and the if should not change the outcome, this is also a delay between marvell_nfc_enable_int() and marvell_nfc_disable_int() which is probably more significant. Sure enough if I move the delay to just before the marvell_nfc_disable_int() the error is not seen.
AFAICT, your timeout always happens when waiting for RDREQ, not RDYM. So maybe disabling MRDY too early has a side-effect on the RDREQ event.
Can you try with this patch [1]? It should ensure that NDSR_RDY bits are cleared before starting an operation.