[PATCH v2 3/3] remoteproc/keystone: Ensure the DSPs are in reset in probe

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




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

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@xxxxxx>
[s-anna@xxxxxx: replace warning with a WARN]
Signed-off-by: Suman Anna <s-anna@xxxxxx>
---
v2: No code changes

 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",
-- 
2.12.0

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux