soc: fsl: dpio: perform DPIO Reset on Probe

Invoke a DPIO reset command when a DPIO device is probed. This
will ensure the QBMan portal is in the state the driver expects.
Signed-off-by: Roy Pledge <roy.pledge@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

drivers/soc/fsl/dpio/dpio-cmd.h

@@ -25,6 +25,7 @@
 #define DPIO_CMDID_ENABLE				DPIO_CMD(0x002)
 #define DPIO_CMDID_DISABLE				DPIO_CMD(0x003)
 #define DPIO_CMDID_GET_ATTR				DPIO_CMD(0x004)
+#define DPIO_CMDID_RESET				DPIO_CMD(0x005)
 
 struct dpio_cmd_open {
 	__le32 dpio_id;

drivers/soc/fsl/dpio/dpio-driver.c

@@ -110,6 +110,12 @@ static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)
 		goto err_open;
 	}
 
+	err = dpio_reset(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dpio_reset() failed\n");
+		goto err_reset;
+	}
+
 	err = dpio_get_attributes(dpio_dev->mc_io, 0, dpio_dev->mc_handle,
 				  &dpio_attrs);
 	if (err) {
@@ -192,6 +198,7 @@ static int dpaa2_dpio_probe(struct fsl_mc_device *dpio_dev)
 err_allocate_irqs:
 	dpio_disable(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
 err_get_attr:
+err_reset:
 	dpio_close(dpio_dev->mc_io, 0, dpio_dev->mc_handle);
 err_open:
 	fsl_mc_portal_free(dpio_dev->mc_io);

drivers/soc/fsl/dpio/dpio.c

@@ -196,3 +196,26 @@ int dpio_get_api_version(struct fsl_mc_io *mc_io,
 
 	return 0;
 }
+
+/**
+ * dpio_reset() - Reset the DPIO, returns the object to initial state.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPIO object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpio_reset(struct fsl_mc_io *mc_io,
+	       u32 cmd_flags,
+	       u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_RESET,
+					  cmd_flags,
+					  token);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}

drivers/soc/fsl/dpio/dpio.h

@@ -80,4 +80,8 @@ int dpio_get_api_version(struct fsl_mc_io *mc_io,
 			 u16 *major_ver,
 			 u16 *minor_ver);
 
+int dpio_reset(struct fsl_mc_io	*mc_io,
+	       u32 cmd_flags,
+	       u16 token);
+
 #endif /* __FSL_DPIO_H */