linux-kernel - [PATCH v3 3/3] remoteproc/keystone: Ensure the DSPs are in reset in probe

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Date:   Tue, 13 Jun 2017 18:45:13 -0500
From:   Suman Anna <s-anna@...com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-remoteproc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Suman Anna <s-anna@...com>, "Andrew F. Davis" <afd@...com>,
        Sam Nelson <sam.nelson@...com>
Subject: [PATCH v3 3/3] remoteproc/keystone: Ensure the DSPs are in reset in probe

From: "Andrew F. Davis" <afd@...com>

The DSPs are expected to be in reset when the driver probes a device.
If the DSPs are out of reset in probe, the system may crash when the
firmware is being loaded. So, add a check to make sure the DSP resets
are asserted, and if not, throw a eye-catchy warning and assert the
resets specifically.

Signed-off-by: Andrew F. Davis <afd@...com>
[s-anna@...com: replace warning with a WARN]
Signed-off-by: Suman Anna <s-anna@...com>
Acked-by: Santosh Shilimkar <ssantosh@...nel.org>
---
v3: No code changes, picked up Santosh's Ack
v2: https://patchwork.kernel.org/patch/9773679/

 drivers/remoteproc/keystone_remoteproc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/remoteproc/keystone_remoteproc.c b/drivers/remoteproc/keystone_remoteproc.c
index 6e09ef76f7c7..5f776bfd674a 100644
--- a/drivers/remoteproc/keystone_remoteproc.c
+++ b/drivers/remoteproc/keystone_remoteproc.c
@@ -456,6 +456,16 @@ static int keystone_rproc_probe(struct platform_device *pdev)
 	if (of_reserved_mem_device_init(dev))
 		dev_warn(dev, "device does not have specific CMA pool\n");
 
+	/* ensure the DSP is in reset before loading firmware */
+	ret = reset_control_status(ksproc->reset);
+	if (ret < 0) {
+		dev_err(dev, "failed to get reset status, status = %d\n", ret);
+		goto release_mem;
+	} else if (ret == 0) {
+		WARN(1, "device is not in reset\n");
+		keystone_rproc_dsp_reset(ksproc);
+	}
+
 	ret = rproc_add(rproc);
 	if (ret) {
 		dev_err(dev, "failed to add register device with remoteproc core, status = %d\n",
-- 
2.13.1