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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2022-02-28 20:25:28 +0300
committerVinod Koul <vkoul@kernel.org>2022-03-02 18:42:29 +0300
commit04d46a7b38375aef945b663a3957f85025f74934 (patch)
tree72807be6eb22756753d6295d1656937522fa5701 /drivers/soundwire
parentc7449e766de3c7334d5ded1ab18e17fb9fb4dd76 (diff)
downloadlinux-04d46a7b38375aef945b663a3957f85025f74934.tar.xz
soundwire: qcom: add in-band wake up interrupt support
Some of the Qualcomm SoundWire Controller instances like the ones that are connected to RX path along with Headset connections support Waking up Controller from Low power clock stop state using SoundWire In-band interrupt. SoundWire Slave on the bus would initiate this by pulling the data line high, while the clock is stopped. Add support to this wake up interrupt. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20220228172528.3489-4-srinivas.kandagatla@linaro.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
-rw-r--r--drivers/soundwire/qcom.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 810232686196..e5c75305a90a 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -14,6 +14,7 @@
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/pm_wakeirq.h>
#include <linux/slimbus.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
@@ -154,6 +155,7 @@ struct qcom_swrm_ctrl {
u8 rd_cmd_id;
int irq;
unsigned int version;
+ int wake_irq;
int num_din_ports;
int num_dout_ports;
int cols_index;
@@ -503,6 +505,30 @@ static int qcom_swrm_enumerate(struct sdw_bus *bus)
return 0;
}
+static irqreturn_t qcom_swrm_wake_irq_handler(int irq, void *dev_id)
+{
+ struct qcom_swrm_ctrl *swrm = dev_id;
+ int ret;
+
+ ret = pm_runtime_get_sync(swrm->dev);
+ if (ret < 0 && ret != -EACCES) {
+ dev_err_ratelimited(swrm->dev,
+ "pm_runtime_get_sync failed in %s, ret %d\n",
+ __func__, ret);
+ pm_runtime_put_noidle(swrm->dev);
+ }
+
+ if (swrm->wake_irq > 0) {
+ if (!irqd_irq_disabled(irq_get_irq_data(swrm->wake_irq)))
+ disable_irq_nosync(swrm->wake_irq);
+ }
+
+ pm_runtime_mark_last_busy(swrm->dev);
+ pm_runtime_put_autosuspend(swrm->dev);
+
+ return IRQ_HANDLED;
+}
+
static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
{
struct qcom_swrm_ctrl *swrm = dev_id;
@@ -1340,6 +1366,18 @@ static int qcom_swrm_probe(struct platform_device *pdev)
goto err_clk;
}
+ ctrl->wake_irq = of_irq_get(dev->of_node, 1);
+ if (ctrl->wake_irq > 0) {
+ ret = devm_request_threaded_irq(dev, ctrl->wake_irq, NULL,
+ qcom_swrm_wake_irq_handler,
+ IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+ "swr_wake_irq", ctrl);
+ if (ret) {
+ dev_err(dev, "Failed to request soundwire wake irq\n");
+ goto err_init;
+ }
+ }
+
ret = sdw_bus_master_add(&ctrl->bus, dev, dev->fwnode);
if (ret) {
dev_err(dev, "Failed to register Soundwire controller (%d)\n",
@@ -1424,6 +1462,11 @@ static int swrm_runtime_resume(struct device *dev)
struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev);
int ret;
+ if (ctrl->wake_irq > 0) {
+ if (!irqd_irq_disabled(irq_get_irq_data(ctrl->wake_irq)))
+ disable_irq_nosync(ctrl->wake_irq);
+ }
+
clk_prepare_enable(ctrl->hclk);
if (ctrl->clock_stop_not_supported) {
@@ -1491,6 +1534,11 @@ static int __maybe_unused swrm_runtime_suspend(struct device *dev)
usleep_range(300, 305);
+ if (ctrl->wake_irq > 0) {
+ if (irqd_irq_disabled(irq_get_irq_data(ctrl->wake_irq)))
+ enable_irq(ctrl->wake_irq);
+ }
+
return 0;
}