From: Markus Mayer <code@mmayer.net>
To: Brian Norris <computersforpeace@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Gregory Fong <gregory.0xf0@gmail.com>
Cc: Markus Mayer <mmayer@broadcom.com>,
Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>,
ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [PATCH 3/6] memory: brcmstb: dpfe: wait for DCPU to be ready
Date: Tue, 2 Apr 2019 16:01:00 -0700 [thread overview]
Message-ID: <20190402230103.25491-4-code@mmayer.net> (raw)
In-Reply-To: <20190402230103.25491-1-code@mmayer.net>
From: Markus Mayer <mmayer@broadcom.com>
We wait for the DCPU to be ready before sending a command.
Signed-off-by: Markus Mayer <mmayer@broadcom.com>
---
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
next prev parent reply other threads:[~2019-04-02 23:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-02 23:00 [PATCH 0/6] memory: brcmstb: dpfe: introduce DPFE API v3 Markus Mayer
2019-04-02 23:00 ` [PATCH 1/6] memory: brcmstb: dpfe: remove unused code and fix formatting Markus Mayer
2019-04-17 18:53 ` Florian Fainelli
2019-04-02 23:00 ` [PATCH 2/6] memory: brcmstb: dpfe: report firmware loading error Markus Mayer
2019-04-17 18:53 ` Florian Fainelli
2019-04-02 23:01 ` Markus Mayer [this message]
2019-04-17 18:54 ` [PATCH 3/6] memory: brcmstb: dpfe: wait for DCPU to be ready Florian Fainelli
2019-04-02 23:01 ` [PATCH 4/6] memory: brcmstb: dpfe: prepare support for multiple API versions Markus Mayer
2019-04-17 18:54 ` Florian Fainelli
2019-04-02 23:01 ` [PATCH 5/6] memory: brcmstb: dpfe: prepare for API-dependent sysfs attributes Markus Mayer
2019-04-17 18:54 ` Florian Fainelli
2019-04-02 23:01 ` [PATCH 6/6] memory: brcmstb: dpfe: introduce DPFE API v3 Markus Mayer
2019-04-17 18:54 ` Florian Fainelli
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