board/freescale/vid: enables writes to all commands for LTC3882

Enable writes to all commands for LTC3882

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

diff --git a/board/freescale/common/vid.c b/board/freescale/common/vid.c
index bf8a5d8..9c51f50 100644 (file)
--- a/board/freescale/common/vid.c
+++ b/board/freescale/common/vid.c
@@ -379,6 +379,7 @@ static int set_voltage_to_LTC(int i2caddress, int vdd)
 {
        int ret, vdd_last, vdd_target = vdd;
        int count = 100, temp = 0;
+       unsigned char value;
 
        /* Scale up to the LTC resolution is 1/4096V */
        vdd = (vdd * 4096) / 1000;
@@ -391,16 +392,51 @@ static int set_voltage_to_LTC(int i2caddress, int vdd)
 
        /* Write the desired voltage code to the regulator */
 #ifndef CONFIG_DM_I2C
+       /* Check write protect state */
+       ret = i2c_read(I2C_VOL_MONITOR_ADDR,
+                      PMBUS_CMD_WRITE_PROTECT, 1,
+                      (void *)&value, sizeof(value));
+       if (ret)
+               goto exit;
+
+       if (value != EN_WRITE_ALL_CMD) {
+               value = EN_WRITE_ALL_CMD;
+               ret = i2c_write(I2C_VOL_MONITOR_ADDR,
+                               PMBUS_CMD_WRITE_PROTECT, 1,
+                               (void *)&value, sizeof(value));
+               if (ret)
+                       goto exit;
+       }
+
        ret = i2c_write(I2C_VOL_MONITOR_ADDR,
-                       PMBUS_CMD_PAGE_PLUS_WRITE, 1, (void *)&buff, 5);
+                       PMBUS_CMD_PAGE_PLUS_WRITE, 1,
+                       (void *)&buff, sizeof(buff));
 #else
        struct udevice *dev;
 
        ret = i2c_get_chip_for_busnum(0, I2C_VOL_MONITOR_ADDR, 1, &dev);
-       if (!ret)
+       if (!ret) {
+               /* Check write protect state */
+               ret = dm_i2c_read(dev,
+                                 PMBUS_CMD_WRITE_PROTECT,
+                                 (void *)&value, sizeof(value));
+               if (ret)
+                       goto exit;
+
+               if (value != EN_WRITE_ALL_CMD) {
+                       value = EN_WRITE_ALL_CMD;
+                       ret = dm_i2c_write(dev,
+                                          PMBUS_CMD_WRITE_PROTECT,
+                                          (void *)&value, sizeof(value));
+                       if (ret)
+                               goto exit;
+               }
+
                ret = dm_i2c_write(dev, PMBUS_CMD_PAGE_PLUS_WRITE,
-                                  (void *)&buff, 5);
+                                  (void *)&buff, sizeof(buff));
+       }
 #endif
+exit:
        if (ret) {
                printf("VID: I2C failed to write to the volatge regulator\n");
                return -1;

diff --git a/board/freescale/common/vid.h b/board/freescale/common/vid.h
index 99778e9..65b348e 100644 (file)
--- a/board/freescale/common/vid.h
+++ b/board/freescale/common/vid.h
@@ -18,6 +18,25 @@
 /* step the IR regulator in 5mV increments */
 #define IR_VDD_STEP_DOWN               5
 #define IR_VDD_STEP_UP                 5
+
+/* LTC3882 */
+#define PMBUS_CMD_WRITE_PROTECT         0x10
+/*
+ * WRITE_PROTECT command supported values
+ * 0x80: Disable all writes except WRITE_PROTECT, PAGE,
+ *       STORE_USER_ALL and MFR_EE_UNLOCK commands.
+ * 0x40: Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ALL,
+ *       MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS and CLEAR_FAULTS commands.
+ *       Individual faults can also be cleared by writing a 1 to the
+ *       respective status bit.
+ * 0x20: Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ ALL,
+ *       MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS, CLEAR_FAULTS, ON_OFF_CONFIG
+ *       and VOUT_COMMAND commands. Individual faults can be cleared by
+ *       writing a 1 to the respective status bit.
+ * 0x00: Enables write to all commands
+ */
+#define EN_WRITE_ALL_CMD (0)
+
 int adjust_vdd(ulong vdd_override);
 
 #endif  /* __VID_H_ */