On 5/7/24 08:30, Viken Dadhaniya wrote:
Currently slimbus driver doesn't support stream disable
callback, it only supports stream enable callback.
In slimbus usecase, client is switching to new frequency
with same channel and calling enable stream callback for
new frequency but DSP subsystem is crashing as we are switching
to new frequency with same channel without disabling stream
for older frequency.
This is very difficult to read
but AFAICU comes down to:
"Trying to switch frequencies without closing the channel results
in an attempt to re-enable the channel without a clean shutdown,
which then leads to a crash on the ADSP."
Ideally, before switching to another frequency, client should
call disable stream callback and then enable stream for newer frequency.
Hence add support to disable stream via qcom_slim_ngd_disable_stream().
Signed-off-by: Viken Dadhaniya <quic_vdadhani@xxxxxxxxxxx>
---
drivers/slimbus/qcom-ngd-ctrl.c | 70 +++++++++++++++++++++++++++++++++
drivers/slimbus/slimbus.h | 13 ++++++
2 files changed, 83 insertions(+)
diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index e0b21f0f79c1..d952827d2e12 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
// Copyright (c) 2018, Linaro Limited
+// Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
#include <linux/irq.h>
#include <linux/kernel.h>
@@ -1084,6 +1085,74 @@ static int qcom_slim_ngd_enable_stream(struct slim_stream_runtime *rt)
return ret;
}
+static int qcom_slim_ngd_disable_stream(struct slim_stream_runtime *rt)
+{
+ struct slim_device *sdev = rt->dev;
+ struct slim_controller *ctrl = sdev->ctrl;
+ struct slim_val_inf msg = {0};
+ u8 wbuf[SLIM_MSGQ_BUF_LEN];
+ u8 rbuf[SLIM_MSGQ_BUF_LEN];
+ struct slim_msg_txn txn = {0,};
{ 0 } is enough
Also, reverse-Christmas-tre, please
+ int i, ret;
+
+ txn.mt = SLIM_MSG_MT_DEST_REFERRED_USER;
+ txn.dt = SLIM_MSG_DEST_LOGICALADDR;
+ txn.la = SLIM_LA_MGR;
+ txn.ec = 0;
+ txn.msg = &msg;
+ txn.msg->num_bytes = 0;
+ txn.msg->wbuf = wbuf;
+ txn.msg->rbuf = rbuf;
+
+ for (i = 0; i < rt->num_ports; i++) {
+ struct slim_port *port = &rt->ports[i];
+
+ if (txn.msg->num_bytes == 0) {
+ wbuf[txn.msg->num_bytes++] = (u8)(SLIM_CH_REMOVE << 6)
+ | (sdev->laddr & 0x1f);
Add a #define and use FIELD_PREP
+
+ ret = slim_alloc_txn_tid(ctrl, &txn);
+ if (ret) {
+ dev_err(&sdev->dev, "Fail to allocate TID\n");
+ return -ENXIO;
+ }
+ wbuf[txn.msg->num_bytes++] = txn.tid;
+ }
+ wbuf[txn.msg->num_bytes++] = port->ch.id;
+ }
+
+ txn.mc = SLIM_USR_MC_CHAN_CTRL;
+ txn.rl = txn.msg->num_bytes + 4;
Why +4?
+ ret = qcom_slim_ngd_xfer_msg_sync(ctrl, &txn);
+ if (ret) {
+ slim_free_txn_tid(ctrl, &txn);
+ dev_err(&sdev->dev, "TX timed out:MC:0x%x,mt:0x%x ret:%d\n",
Please clean this up, add commas to separate all three prints and a
space after each comma
[...]
+/*
+ * enum slim_ch_control: Channel control.
+ * Activate will schedule channel and/or group of channels in the TDM frame.
+ * Suspend will keep the schedule but data-transfer won't happen.
+ * Remove will remove the channel/group from the TDM frame.
"will" suggests these are not immediate.
Konrad
