From: Markus Mayer <[email protected]> We wait for the DCPU to be ready before sending a command.
Signed-off-by: Markus Mayer <[email protected]> --- drivers/memory/brcmstb_dpfe.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) 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)); -- 2.17.1
