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remoteproc/keystone: Ensure the DSPs are in reset in probe

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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 <[email protected]>
[[email protected]: replace warning with a WARN]
Signed-off-by: Suman Anna <[email protected]>
Acked-by: Santosh Shilimkar <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
This commit is contained in:
Andrew F. Davis 2017-06-13 18:45:13 -05:00 • committed by Bjorn Andersson
commit 11d2a2ffa8
1 changed files with 10 additions and 0 deletions
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10
drivers/remoteproc/keystone_remoteproc.c
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@ -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",