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| author | Markus Mayer <mmayer@broadcom.com> | 2019-04-03 02:01:00 +0300 |
|---|---|---|
| committer | Florian Fainelli <f.fainelli@gmail.com> | 2019-05-20 19:32:35 +0300 |
| commit | a7c25759d8d84b64c437a78f05df7314b02934e5 (patch) | |
| tree | 3d07554a5b42933fe7dd03d0ba17e2f399d29385 | |
| parent | 6ca5d2ba9e49113ed812b16e04e9e0a31f008e6f (diff) | |
| download | linux-a7c25759d8d84b64c437a78f05df7314b02934e5.tar.xz | |
memory: brcmstb: dpfe: wait for DCPU to be ready
We wait for the DCPU to be ready before sending a command.
Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
| -rw-r--r-- | drivers/memory/brcmstb_dpfe.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/memory/brcmstb_dpfe.c b/drivers/memory/brcmstb_dpfe.c index c67774a4fe8b..f8d05a8266c3 100644 --- a/drivers/memory/brcmstb_dpfe.c +++ b/drivers/memory/brcmstb_dpfe.c @@ -304,6 +304,18 @@ static int __send_command(struct private_data *priv, unsigned int cmd, mutex_lock(&priv->lock); + /* Wait for DCPU to become ready */ + for (i = 0; i < DELAY_LOOP_MAX; i++) { + resp = readl_relaxed(regs + REG_TO_HOST_MBOX); + if (resp == 0) + break; + msleep(1); + } + if (resp != 0) { + mutex_unlock(&priv->lock); + return -ETIMEDOUT; + } + /* Write command and arguments to message area */ for (i = 0; i < MSG_FIELD_MAX; i++) writel_relaxed(msg[i], regs + DCPU_MSG_RAM(i)); |