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From: "H. Nikolaus Schaller" <hns@goldelico.com>
To: Evgeniy Polyakov <zbr@ioremap.net>,
	"H. Nikolaus Schaller" <hns@goldelico.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	YueHaibing <yuehaibing@huawei.com>,
	Tony Lindgren <tony@atomide.com>
Cc: linux-kernel@vger.kernel.org, kernel@pyra-handheld.com,
	letux-kernel@openphoenux.org, linux-omap@vger.kernel.org
Subject: [PATCH 4/4] w1: omap-hdq: print dev_err if irq flags are not cleared
Date: Sat, 23 May 2020 19:32:57 +0200
Message-ID: <2de305d3046c7281a7123347899abbaa64c54fb8.1590255176.git.hns@goldelico.com> (raw)
In-Reply-To: <cover.1590255176.git.hns@goldelico.com>

If irq flags are not cleared for certain operations we
print an error message.

Since this should never occur in normal operation, this
patch is an optional safety-net and debugging tool.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/w1/masters/omap_hdq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index a6484700f3b388..bf2ec59c1f9ddc 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -146,6 +146,10 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
 		goto rtn;
 	}
 
+	if (hdq_data->hdq_irqstatus)
+		dev_err(hdq_data->dev, "TX irqstatus not cleared (%02x)\n",
+			hdq_data->hdq_irqstatus);
+
 	*status = 0;
 
 	hdq_reg_out(hdq_data, OMAP_HDQ_TX_DATA, val);
@@ -243,6 +247,10 @@ static int omap_hdq_break(struct hdq_data *hdq_data)
 		goto rtn;
 	}
 
+	if (hdq_data->hdq_irqstatus)
+		dev_err(hdq_data->dev, "break irqstatus not cleared (%02x)\n",
+			hdq_data->hdq_irqstatus);
+
 	/* set the INIT and GO bit */
 	hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS,
 		OMAP_HDQ_CTRL_STATUS_INITIALIZATION | OMAP_HDQ_CTRL_STATUS_GO,
-- 
2.26.2


      parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23 17:32 [PATCH 0/4] w1: omap: fix some regressions/bugs (some were introduced in v5.6 but some are older) H. Nikolaus Schaller
2020-05-23 17:32 ` [PATCH 1/4] w1: omap-hdq: cleanup to add missing newline for some dev_dbg H. Nikolaus Schaller
2020-05-23 18:09   ` Tony Lindgren
2020-05-23 17:32 ` [PATCH 2/4] w1: omap-hdq: fix return value to be -1 if there is a timeout H. Nikolaus Schaller
2020-05-23 18:11   ` Tony Lindgren
2020-05-23 17:32 ` [PATCH 3/4] w1: omap-hdq: fix interrupt handling which did show spurious timeouts H. Nikolaus Schaller
2020-05-23 17:32 ` H. Nikolaus Schaller [this message]

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