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Date: Fri, 29 Jan 2021 17:32:48 +0000
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: vkoul@...nel.org
Cc: yung-chuan.liao@...ux.intel.com,
pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 6/6] soundwire: qcom: add support to new interrupts
Add support to new interrupts and update irq routine in a way
to deal with multiple pending interrupts with in a single interrupt!
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
drivers/soundwire/qcom.c | 191 ++++++++++++++++++++++++++++++---------
1 file changed, 146 insertions(+), 45 deletions(-)
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index d61b204dc284..c699bd51d29a 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -28,10 +28,21 @@
#define SWRM_COMP_PARAMS_DIN_PORTS_MASK GENMASK(9, 5)
#define SWRM_INTERRUPT_STATUS 0x200
#define SWRM_INTERRUPT_STATUS_RMSK GENMASK(16, 0)
+#define SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ BIT(0)
#define SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED BIT(1)
#define SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS BIT(2)
+#define SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET BIT(3)
+#define SWRM_INTERRUPT_STATUS_RD_FIFO_OVERFLOW BIT(4)
+#define SWRM_INTERRUPT_STATUS_RD_FIFO_UNDERFLOW BIT(5)
+#define SWRM_INTERRUPT_STATUS_WR_CMD_FIFO_OVERFLOW BIT(6)
#define SWRM_INTERRUPT_STATUS_CMD_ERROR BIT(7)
+#define SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION BIT(8)
+#define SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH BIT(9)
#define SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED BIT(10)
+#define SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED_V2 BIT(13)
+#define SWRM_INTERRUPT_STATUS_CLK_STOP_FINISHED_V2 BIT(14)
+#define SWRM_INTERRUPT_STATUS_EXT_CLK_STOP_WAKEUP BIT(16)
+#define SWRM_INTERRUPT_MAX 17
#define SWRM_INTERRUPT_MASK_ADDR 0x204
#define SWRM_INTERRUPT_CLEAR 0x208
#define SWRM_INTERRUPT_CPU_EN 0x210
@@ -105,11 +116,8 @@ struct qcom_swrm_ctrl {
struct device *dev;
struct regmap *regmap;
void __iomem *mmio;
- struct completion *comp;
struct completion broadcast;
struct work_struct slave_work;
- /* read/write lock */
- spinlock_t comp_lock;
/* Port alloc/free lock */
struct mutex port_lock;
struct mutex io_lock;
@@ -126,6 +134,7 @@ struct qcom_swrm_ctrl {
int rows_index;
unsigned long dout_port_mask;
unsigned long din_port_mask;
+ u32 intr_mask;
u8 rcmd_id;
u8 wcmd_id;
struct qcom_swrm_port_config pconfig[QCOM_SDW_MAX_PORTS];
@@ -315,6 +324,27 @@ static int qcom_swrm_cmd_fifo_rd_cmd(struct qcom_swrm_ctrl *swrm,
return ret;
}
+static int qcom_swrm_get_alert_slave(struct qcom_swrm_ctrl *ctrl)
+{
+ u32 val;
+ int i;
+
+ ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
+
+ for (i = 0; i < SDW_MAX_DEVICES; i++) {
+ u32 s;
+
+ s = (val >> (i * 2));
+
+ if ((s & SWRM_MCP_SLV_STATUS_MASK) == SDW_SLAVE_ALERT) {
+ ctrl->status[i] = s;
+ return i;
+ }
+ }
+
+ return -EINVAL;
+}
+
static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
{
u32 val;
@@ -333,40 +363,122 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
{
- struct qcom_swrm_ctrl *ctrl = dev_id;
- u32 sts, value;
- unsigned long flags;
-
- ctrl->reg_read(ctrl, SWRM_INTERRUPT_STATUS, &sts);
-
- if (sts & SWRM_INTERRUPT_STATUS_CMD_ERROR) {
- ctrl->reg_read(ctrl, SWRM_CMD_FIFO_STATUS, &value);
- dev_err_ratelimited(ctrl->dev,
- "CMD error, fifo status 0x%x\n",
- value);
- ctrl->reg_write(ctrl, SWRM_CMD_FIFO_CMD, 0x1);
- }
+ struct qcom_swrm_ctrl *swrm = dev_id;
+ u32 value, intr_sts, intr_sts_masked;
+ u32 i;
+ u8 devnum = 0;
+ int ret = IRQ_HANDLED;
+
+
+ swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
+ intr_sts_masked = intr_sts & swrm->intr_mask;
+
+handle_irq:
+ for (i = 0; i < SWRM_INTERRUPT_MAX; i++) {
+ value = intr_sts_masked & (1 << i);
+ if (!value)
+ continue;
+
+ switch (value) {
+ case SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ:
+ devnum = qcom_swrm_get_alert_slave(swrm);
+ if (devnum < 0) {
+ dev_err_ratelimited(swrm->dev,
+ "no slave alert found.spurious interrupt\n");
+ } else {
+ sdw_handle_slave_status(&swrm->bus, swrm->status);
+ }
- if ((sts & SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED) ||
- sts & SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS)
- schedule_work(&ctrl->slave_work);
-
- /**
- * clear the interrupt before complete() is called, as complete can
- * schedule new read/writes which require interrupts, clearing the
- * interrupt would avoid missing interrupts in such cases.
- */
- ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR, sts);
-
- if (sts & SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED) {
- spin_lock_irqsave(&ctrl->comp_lock, flags);
- if (ctrl->comp)
- complete(ctrl->comp);
- spin_unlock_irqrestore(&ctrl->comp_lock, flags);
+ break;
+ case SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED:
+ case SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS:
+ dev_err_ratelimited(swrm->dev, "%s: SWR new slave attached\n",
+ __func__);
+ qcom_swrm_get_device_status(swrm);
+ sdw_handle_slave_status(&swrm->bus, swrm->status);
+ break;
+ case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET:
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR bus clsh detected\n",
+ __func__);
+ swrm->intr_mask &=
+ ~SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET;
+ swrm->reg_write(swrm,
+ SWRM_INTERRUPT_CPU_EN,
+ swrm->intr_mask);
+ break;
+ case SWRM_INTERRUPT_STATUS_RD_FIFO_OVERFLOW:
+ swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value);
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR read FIFO overflow fifo status 0x%x\n",
+ __func__, value);
+ break;
+ case SWRM_INTERRUPT_STATUS_RD_FIFO_UNDERFLOW:
+ swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value);
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR read FIFO underflow fifo status 0x%x\n",
+ __func__, value);
+ break;
+ case SWRM_INTERRUPT_STATUS_WR_CMD_FIFO_OVERFLOW:
+ swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value);
+ dev_err(swrm->dev,
+ "%s: SWR write FIFO overflow fifo status %x\n",
+ __func__, value);
+ swrm->reg_write(swrm, SWRM_CMD_FIFO_CMD, 0x1);
+ break;
+ case SWRM_INTERRUPT_STATUS_CMD_ERROR:
+ swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value);
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR CMD error, fifo status 0x%x, flushing fifo\n",
+ __func__, value);
+ swrm->reg_write(swrm, SWRM_CMD_FIFO_CMD, 0x1);
+ break;
+ case SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION:
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR Port collision detected\n",
+ __func__);
+ swrm->intr_mask &= ~SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION;
+ swrm->reg_write(swrm,
+ SWRM_INTERRUPT_CPU_EN, swrm->intr_mask);
+ break;
+ case SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH:
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR read enable valid mismatch\n",
+ __func__);
+ swrm->intr_mask &=
+ ~SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH;
+ swrm->reg_write(swrm,
+ SWRM_INTERRUPT_CPU_EN, swrm->intr_mask);
+ break;
+ case SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED:
+ complete(&swrm->broadcast);
+ break;
+ case SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED_V2:
+ break;
+ case SWRM_INTERRUPT_STATUS_CLK_STOP_FINISHED_V2:
+ break;
+ case SWRM_INTERRUPT_STATUS_EXT_CLK_STOP_WAKEUP:
+ break;
+ default:
+ dev_err_ratelimited(swrm->dev,
+ "%s: SWR unknown interrupt value: %d\n",
+ __func__, value);
+ ret = IRQ_NONE;
+ break;
+ }
}
+ swrm->reg_write(swrm, SWRM_INTERRUPT_CLEAR, intr_sts);
+ swrm->reg_write(swrm, SWRM_INTERRUPT_CLEAR, 0x0);
+
+ swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
+ intr_sts_masked = intr_sts & swrm->intr_mask;
+
+ if (intr_sts_masked)
+ goto handle_irq;
- return IRQ_HANDLED;
+ return ret;
}
+
static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
{
u32 val;
@@ -380,6 +492,7 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
/* Disable Auto enumeration */
ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0);
+ ctrl->intr_mask = SWRM_INTERRUPT_STATUS_RMSK;
/* Mask soundwire interrupts */
ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR,
SWRM_INTERRUPT_STATUS_RMSK);
@@ -615,16 +728,6 @@ static u32 qcom_swrm_freq_tbl[MAX_FREQ_NUM] = {
DEFAULT_CLK_FREQ,
};
-static void qcom_swrm_slave_wq(struct work_struct *work)
-{
- struct qcom_swrm_ctrl *ctrl =
- container_of(work, struct qcom_swrm_ctrl, slave_work);
-
- qcom_swrm_get_device_status(ctrl);
- sdw_handle_slave_status(&ctrl->bus, ctrl->status);
-}
-
-
static void qcom_swrm_stream_free_ports(struct qcom_swrm_ctrl *ctrl,
struct sdw_stream_runtime *stream)
{
@@ -989,11 +1092,9 @@ static int qcom_swrm_probe(struct platform_device *pdev)
ctrl->dev = dev;
dev_set_drvdata(&pdev->dev, ctrl);
- spin_lock_init(&ctrl->comp_lock);
mutex_init(&ctrl->port_lock);
mutex_init(&ctrl->io_lock);
init_completion(&ctrl->broadcast);
- INIT_WORK(&ctrl->slave_work, qcom_swrm_slave_wq);
ctrl->bus.ops = &qcom_swrm_ops;
ctrl->bus.port_ops = &qcom_swrm_port_ops;
--
2.21.0
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