diff mbox series

[v4,8/9] soundwire: qcom: add auto enumeration support

Message ID 20210312120009.22386-9-srinivas.kandagatla@linaro.org
State Superseded
Headers show
Series soundwire: qcom: various improvements | expand

Commit Message

Srinivas Kandagatla March 12, 2021, noon UTC 
Qualcomm SoundWire controller supports Auto Enumeration of the
devices within the IP. This patch enables support for this feature.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

---
 drivers/soundwire/qcom.c | 86 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 81 insertions(+), 5 deletions(-)

-- 
2.21.0

Comments

kernel test robot March 20, 2021, 6:13 a.m. UTC | #1 
Hi Srinivas,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on sound/for-next asoc/for-next linus/master v5.12-rc3 next-20210319]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Srinivas-Kandagatla/soundwire-qcom-various-improvements/20210312-200407
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: nds32-randconfig-r034-20210318 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/b90acbc1605eb0d901f42506921f50d5a5cf0df7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Srinivas-Kandagatla/soundwire-qcom-various-improvements/20210312-200407
        git checkout b90acbc1605eb0d901f42506921f50d5a5cf0df7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "sdw_slave_add" [drivers/soundwire/soundwire-qcom.ko] undefined!


---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 6a563fb52444..c6c923329b15 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -57,6 +57,8 @@ 
 #define SWRM_CMD_FIFO_RD_FIFO_ADDR				0x318
 #define SWRM_RD_FIFO_CMD_ID_MASK				GENMASK(11, 8)
 #define SWRM_ENUMERATOR_CFG_ADDR				0x500
+#define SWRM_ENUMERATOR_SLAVE_DEV_ID_1(m)		(0x530 + 0x8 * (m))
+#define SWRM_ENUMERATOR_SLAVE_DEV_ID_2(m)		(0x534 + 0x8 * (m))
 #define SWRM_MCP_FRAME_CTRL_BANK_ADDR(m)		(0x101C + 0x40 * (m))
 #define SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK			GENMASK(2, 0)
 #define SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK			GENMASK(7, 3)
@@ -143,6 +145,7 @@  struct qcom_swrm_ctrl {
 	enum sdw_slave_status status[SDW_MAX_DEVICES];
 	int (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg, u32 *val);
 	int (*reg_write)(struct qcom_swrm_ctrl *ctrl, int reg, int val);
+	u32 slave_status;
 };
 
 struct qcom_swrm_data {
@@ -342,6 +345,7 @@  static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
 	int i;
 
 	ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
+	ctrl->slave_status = val;
 
 	for (i = 0; i < SDW_MAX_DEVICES; i++) {
 		u32 s;
@@ -352,10 +356,74 @@  static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
 	}
 }
 
+static void qcom_swrm_set_slave_dev_num(struct sdw_bus *bus,
+					struct sdw_slave *slave, int devnum)
+{
+	struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+	u32 status;
+
+	ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &status);
+	status = (status >> (devnum * SWRM_MCP_SLV_STATUS_SZ));
+	status &= SWRM_MCP_SLV_STATUS_MASK;
+
+	if (status == SDW_SLAVE_ATTACHED) {
+		if (slave)
+			slave->dev_num = devnum;
+		mutex_lock(&bus->bus_lock);
+		set_bit(devnum, bus->assigned);
+		mutex_unlock(&bus->bus_lock);
+	}
+}
+
+static int qcom_swrm_enumerate(struct sdw_bus *bus)
+{
+	struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
+	struct sdw_slave *slave, *_s;
+	struct sdw_slave_id id;
+	u32 val1, val2;
+	bool found;
+	u64 addr;
+	int i;
+	char *buf1 = (char *)&val1, *buf2 = (char *)&val2;
+
+	for (i = 1; i <= SDW_MAX_DEVICES; i++) {
+		/*SCP_Devid5 - Devid 4*/
+		ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_1(i), &val1);
+
+		/*SCP_Devid3 - DevId 2 Devid 1 Devid 0*/
+		ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_2(i), &val2);
+
+		if (!val1 && !val2)
+			break;
+
+		addr = buf2[1] | (buf2[0] << 8) | (buf1[3] << 16) |
+			((u64)buf1[2] << 24) | ((u64)buf1[1] << 32) |
+			((u64)buf1[0] << 40);
+
+		sdw_extract_slave_id(bus, addr, &id);
+		found = false;
+		/* Now compare with entries */
+		list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
+			if (sdw_compare_devid(slave, id) == 0) {
+				qcom_swrm_set_slave_dev_num(bus, slave, i);
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			qcom_swrm_set_slave_dev_num(bus, NULL, i);
+			sdw_slave_add(bus, &id, NULL);
+		}
+	}
+
+	return 0;
+}
+
 static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
 {
 	struct qcom_swrm_ctrl *swrm = dev_id;
-	u32 value, intr_sts, intr_sts_masked;
+	u32 value, intr_sts, intr_sts_masked, slave_status;
 	u32 i;
 	u8 devnum = 0;
 	int ret = IRQ_HANDLED;
@@ -384,8 +452,15 @@  static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
 			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);
+				swrm->reg_read(swrm, SWRM_MCP_SLV_STATUS, &slave_status);
+				if (swrm->slave_status == slave_status) {
+					dev_err(swrm->dev, "Slave status not changed %x\n",
+						slave_status);
+				} else {
+					qcom_swrm_get_device_status(swrm);
+					qcom_swrm_enumerate(&swrm->bus);
+					sdw_handle_slave_status(&swrm->bus, swrm->status);
+				}
 				break;
 			case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET:
 				dev_err_ratelimited(swrm->dev,
@@ -472,8 +547,8 @@  static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
 
 	ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val);
 
-	/* Disable Auto enumeration */
-	ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0);
+	/* Enable Auto enumeration */
+	ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 1);
 
 	ctrl->intr_mask = SWRM_INTERRUPT_STATUS_RMSK;
 	/* Mask soundwire interrupts */
@@ -507,6 +582,7 @@  static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
 		ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN,
 				SWRM_INTERRUPT_STATUS_RMSK);
 	}
+	ctrl->slave_status = 0;
 	return 0;
 }