From: Clark Wang <xiaoning.wang@nxp.com>
To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com,
alexandre.belloni@bootlin.com
Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] i3c: master: svc: add NACK check after start byte sent
Date: Wed, 17 May 2023 11:30:30 +0800 [thread overview]
Message-ID: <20230517033030.3068085-3-xiaoning.wang@nxp.com> (raw)
In-Reply-To: <20230517033030.3068085-1-xiaoning.wang@nxp.com>
Add NACK check after start byte is sent.
It is possible to detect early that a device is not on the bus
and avoid invalid transmissions thereafter.
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
---
drivers/i3c/master/svc-i3c-master.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 4edf33ed207d..0d63b732ef0c 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -92,6 +92,7 @@
#define SVC_I3C_MINTCLR 0x094
#define SVC_I3C_MINTMASKED 0x098
#define SVC_I3C_MERRWARN 0x09C
+#define SVC_I3C_MERRWARN_NACK BIT(2)
#define SVC_I3C_MDMACTRL 0x0A0
#define SVC_I3C_MDATACTRL 0x0AC
#define SVC_I3C_MDATACTRL_FLUSHTB BIT(0)
@@ -1014,6 +1015,11 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
if (ret)
goto emit_stop;
+ if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) {
+ ret = -ENXIO;
+ goto emit_stop;
+ }
+
if (rnw)
ret = svc_i3c_master_read(master, in, xfer_len);
else
--
2.34.1
--
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next prev parent reply other threads:[~2023-05-17 3:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-17 3:30 [PATCH] i3c: master: svc: fix i3c suspend/resume issue Clark Wang
2023-05-17 3:30 ` [PATCH] i3c: master: svc: fix cpu schedule in spin lock Clark Wang
2023-05-22 8:32 ` Miquel Raynal
2023-06-04 22:52 ` (subset) " Alexandre Belloni
2023-05-17 3:30 ` Clark Wang [this message]
2023-05-22 8:33 ` [PATCH] i3c: master: svc: add NACK check after start byte sent Miquel Raynal
2023-05-22 8:31 ` [PATCH] i3c: master: svc: fix i3c suspend/resume issue Miquel Raynal
2023-06-04 22:52 ` (subset) " Alexandre Belloni
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