leds: flash: leds-qcom-flash: Update torch current clamp setting

There is a register to clamp the flash current per LED channel when
safety timer is disabled. It needs to be updated according to the
maximum torch LED current setting to ensure the torch current won't
be clamped unexpectedly.

Fixes: 96a2e24 ("leds: flash: Add driver to support flash LED module in QCOM PMICs")
Signed-off-by: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250729-fix-torch-clamp-issue-v2-1-9b83816437a3@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: fenglinw-qcom

drivers/leds/flash/leds-qcom-flash.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2022, 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022, 2024-2025 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/bitfield.h>
@@ -114,36 +114,39 @@ enum {
 	REG_THERM_THRSH1,
 	REG_THERM_THRSH2,
 	REG_THERM_THRSH3,
+	REG_TORCH_CLAMP,
 	REG_MAX_COUNT,
 };
 
 static const struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = {
-	REG_FIELD(0x08, 0, 7),			/* status1	*/
-	REG_FIELD(0x09, 0, 7),                  /* status2	*/
-	REG_FIELD(0x0a, 0, 7),                  /* status3	*/
-	REG_FIELD_ID(0x40, 0, 7, 3, 1),         /* chan_timer	*/
-	REG_FIELD_ID(0x43, 0, 6, 3, 1),         /* itarget	*/
-	REG_FIELD(0x46, 7, 7),                  /* module_en	*/
-	REG_FIELD(0x47, 0, 5),                  /* iresolution	*/
-	REG_FIELD_ID(0x49, 0, 2, 3, 1),         /* chan_strobe	*/
-	REG_FIELD(0x4c, 0, 2),                  /* chan_en	*/
-	REG_FIELD(0x56, 0, 2),			/* therm_thrsh1 */
-	REG_FIELD(0x57, 0, 2),			/* therm_thrsh2 */
-	REG_FIELD(0x58, 0, 2),			/* therm_thrsh3 */
+	[REG_STATUS1]		= REG_FIELD(0x08, 0, 7),
+	[REG_STATUS2]		= REG_FIELD(0x09, 0, 7),
+	[REG_STATUS3]		= REG_FIELD(0x0a, 0, 7),
+	[REG_CHAN_TIMER]	= REG_FIELD_ID(0x40, 0, 7, 3, 1),
+	[REG_ITARGET]		= REG_FIELD_ID(0x43, 0, 6, 3, 1),
+	[REG_MODULE_EN]		= REG_FIELD(0x46, 7, 7),
+	[REG_IRESOLUTION]	= REG_FIELD(0x47, 0, 5),
+	[REG_CHAN_STROBE]	= REG_FIELD_ID(0x49, 0, 2, 3, 1),
+	[REG_CHAN_EN]		= REG_FIELD(0x4c, 0, 2),
+	[REG_THERM_THRSH1]	= REG_FIELD(0x56, 0, 2),
+	[REG_THERM_THRSH2]	= REG_FIELD(0x57, 0, 2),
+	[REG_THERM_THRSH3]	= REG_FIELD(0x58, 0, 2),
+	[REG_TORCH_CLAMP]	= REG_FIELD(0xec, 0, 6),
 };
 
 static const struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = {
-	REG_FIELD(0x06, 0, 7),			/* status1	*/
-	REG_FIELD(0x07, 0, 6),			/* status2	*/
-	REG_FIELD(0x09, 0, 7),			/* status3	*/
-	REG_FIELD_ID(0x3e, 0, 7, 4, 1),		/* chan_timer	*/
-	REG_FIELD_ID(0x42, 0, 6, 4, 1),		/* itarget	*/
-	REG_FIELD(0x46, 7, 7),			/* module_en	*/
-	REG_FIELD(0x49, 0, 3),			/* iresolution	*/
-	REG_FIELD_ID(0x4a, 0, 6, 4, 1),		/* chan_strobe	*/
-	REG_FIELD(0x4e, 0, 3),			/* chan_en	*/
-	REG_FIELD(0x7a, 0, 2),			/* therm_thrsh1 */
-	REG_FIELD(0x78, 0, 2),			/* therm_thrsh2 */
+	[REG_STATUS1]		= REG_FIELD(0x06, 0, 7),
+	[REG_STATUS2]		= REG_FIELD(0x07, 0, 6),
+	[REG_STATUS3]		= REG_FIELD(0x09, 0, 7),
+	[REG_CHAN_TIMER]	= REG_FIELD_ID(0x3e, 0, 7, 4, 1),
+	[REG_ITARGET]		= REG_FIELD_ID(0x42, 0, 6, 4, 1),
+	[REG_MODULE_EN]		= REG_FIELD(0x46, 7, 7),
+	[REG_IRESOLUTION]	= REG_FIELD(0x49, 0, 3),
+	[REG_CHAN_STROBE]	= REG_FIELD_ID(0x4a, 0, 6, 4, 1),
+	[REG_CHAN_EN]		= REG_FIELD(0x4e, 0, 3),
+	[REG_THERM_THRSH1]	= REG_FIELD(0x7a, 0, 2),
+	[REG_THERM_THRSH2]	= REG_FIELD(0x78, 0, 2),
+	[REG_TORCH_CLAMP]	= REG_FIELD(0xed, 0, 6),
 };
 
 struct qcom_flash_data {
@@ -156,6 +159,7 @@ struct qcom_flash_data {
 	u8			max_channels;
 	u8			chan_en_bits;
 	u8			revision;
+	u8			torch_clamp;
 };
 
 struct qcom_flash_led {
@@ -702,6 +706,7 @@ static int qcom_flash_register_led_device(struct device *dev,
 	u32 current_ua, timeout_us;
 	u32 channels[4];
 	int i, rc, count;
+	u8 torch_clamp;
 
 	count = fwnode_property_count_u32(node, "led-sources");
 	if (count <= 0) {
@@ -751,6 +756,12 @@ static int qcom_flash_register_led_device(struct device *dev,
 	current_ua = min_t(u32, current_ua, TORCH_CURRENT_MAX_UA * led->chan_count);
 	led->max_torch_current_ma = current_ua / UA_PER_MA;
 
+	torch_clamp = (current_ua / led->chan_count) / TORCH_IRES_UA;
+	if (torch_clamp != 0)
+		torch_clamp--;
+
+	flash_data->torch_clamp = max_t(u8, flash_data->torch_clamp, torch_clamp);
+
 	if (fwnode_property_present(node, "flash-max-microamp")) {
 		flash->led_cdev.flags |= LED_DEV_CAP_FLASH;
 
@@ -917,8 +928,7 @@ static int qcom_flash_led_probe(struct platform_device *pdev)
 		flash_data->leds_count++;
 	}
 
-	return 0;
-
+	return regmap_field_write(flash_data->r_fields[REG_TORCH_CLAMP], flash_data->torch_clamp);
 release:
 	while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count)
 		v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]);