* [PATCH] board/freescale/vid: enables writes to all commands for LTC3882
@ 2020-10-12 12:07 Biwen Li
0 siblings, 0 replies; only message in thread
From: Biwen Li @ 2020-10-12 12:07 UTC (permalink / raw)
To: u-boot
From: Biwen Li <biwen.li@nxp.com>
Enable writes to all commands for LTC3882
Signed-off-by: Biwen Li <biwen.li@nxp.com>
---
board/freescale/common/vid.c | 42 +++++++++++++++++++++++++++++++++---
board/freescale/common/vid.h | 19 ++++++++++++++++
2 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/board/freescale/common/vid.c b/board/freescale/common/vid.c
index 43b5d8ebd7..ca8d4b894b 100644
--- a/board/freescale/common/vid.c
+++ b/board/freescale/common/vid.c
@@ -378,6 +378,7 @@ 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;
@@ -390,16 +391,51 @@ 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 99778e9a93..65b348ee42 100644
--- 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_ */
--
2.17.1
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2020-10-12 12:07 [PATCH] board/freescale/vid: enables writes to all commands for LTC3882 Biwen Li
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