Messages in this thread Patch in this message | | | From | Suman Anna <> | Subject | [PATCH 3/3] remoteproc/keystone: ensure the DSPs are in reset in probe | Date | Fri, 26 May 2017 11:53:17 -0500 |
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From: "Andrew F. Davis" <afd@ti.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@ti.com> [s-anna@ti.com: replace warning with a WARN] Signed-off-by: Suman Anna <s-anna@ti.com> --- 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 d01d5e3fce28..8233664e85fa 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
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