linux-kernel - [PATCH v3 33/40] fsi: hub master: Reset hub master after errors

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Message-Id: <20240516181907.3468796-34-eajames@linux.ibm.com>
Date: Thu, 16 May 2024 13:19:00 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: linux-fsi@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-spi@...r.kernel.org, broonie@...nel.org, andi.shyti@...nel.org,
        joel@....id.au, alistair@...ple.id.au, jk@...abs.org,
        andrew@...econstruct.com.au, linux-aspeed@...ts.ozlabs.org,
        eajames@...ux.ibm.com
Subject: [PATCH v3 33/40] fsi: hub master: Reset hub master after errors

The hub master driver wasn't clearing errors after accessing remote
slaves. Perform the standard master reset procedure to clear errors
to fully recover.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/fsi/fsi-master-hub.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index 4dbc542500bbd..1bd53b1e52a91 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -49,24 +49,34 @@ static int hub_master_read(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, void *val, size_t size)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(master);
+	int rc;
 
 	if (id != 0)
 		return -EINVAL;
 
 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
-	return fsi_slave_read(hub->upstream->slave, addr, val, size);
+	rc = fsi_slave_read(hub->upstream->slave, addr, val, size);
+	if (rc)
+		fsi_master_error(master, link);
+
+	return rc;
 }
 
 static int hub_master_write(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, const void *val, size_t size)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(master);
+	int rc;
 
 	if (id != 0)
 		return -EINVAL;
 
 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
-	return fsi_slave_write(hub->upstream->slave, addr, val, size);
+	rc = fsi_slave_write(hub->upstream->slave, addr, val, size);
+	if (rc)
+		fsi_master_error(master, link);
+
+	return rc;
 }
 
 static int hub_master_break(struct fsi_master *master, int link)
-- 
2.39.3