From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, kuba@kernel.org
Cc: bjorn.andersson@linaro.org, evgreen@chromium.org,
cpratapa@codeaurora.org, subashab@codeaurora.org,
elder@kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next 3/5] net: ipa: add clock reference for remoteproc SSR
Date: Tue, 27 Jul 2021 16:19:31 -0500 [thread overview]
Message-ID: <20210727211933.926593-4-elder@linaro.org> (raw)
In-Reply-To: <20210727211933.926593-1-elder@linaro.org>
The remoteproc SSR callback function for the modem requires hardware
access when handling a modem crash or shutdown. Take and later
release an IPA clock reference in ipa_modem_crashed(), to ensure the
hardware is operational.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_modem.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/ipa/ipa_modem.c b/drivers/net/ipa/ipa_modem.c
index c851e2cf12552..a744b81db0d9f 100644
--- a/drivers/net/ipa/ipa_modem.c
+++ b/drivers/net/ipa/ipa_modem.c
@@ -20,6 +20,7 @@
#include "ipa_smp2p.h"
#include "ipa_qmi.h"
#include "ipa_uc.h"
+#include "ipa_clock.h"
#define IPA_NETDEV_NAME "rmnet_ipa%d"
#define IPA_NETDEV_TAILROOM 0 /* for padding by mux layer */
@@ -279,6 +280,8 @@ static void ipa_modem_crashed(struct ipa *ipa)
struct device *dev = &ipa->pdev->dev;
int ret;
+ ipa_clock_get(ipa);
+
ipa_endpoint_modem_pause_all(ipa, true);
ipa_endpoint_modem_hol_block_clear_all(ipa);
@@ -303,6 +306,8 @@ static void ipa_modem_crashed(struct ipa *ipa)
ret = ipa_mem_zero_modem(ipa);
if (ret)
dev_err(dev, "error %d zeroing modem memory regions\n", ret);
+
+ ipa_clock_put(ipa);
}
static int ipa_modem_notify(struct notifier_block *nb, unsigned long action,
--
2.27.0
next prev parent reply other threads:[~2021-07-27 21:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 21:19 [PATCH net-next 0/5] net: ipa: add clock references Alex Elder
2021-07-27 21:19 ` [PATCH net-next 1/5] net: ipa: get clock in ipa_probe() Alex Elder
2021-07-27 21:19 ` [PATCH net-next 2/5] net: ipa: get another clock for ipa_setup() Alex Elder
2021-07-27 21:19 ` Alex Elder [this message]
2021-07-27 21:19 ` [PATCH net-next 4/5] net: ipa: add a clock reference for netdev operations Alex Elder
2021-07-27 21:19 ` [PATCH net-next 5/5] net: ipa: don't suspend endpoints if setup not complete Alex Elder
2021-07-27 23:10 ` [PATCH net-next 0/5] net: ipa: add clock references patchwork-bot+netdevbpf
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