linux-kernel - [PATCH 1/2] leds: rgb: leds-qcom-lpg: Add PPG check for setting/clearing PBS triggers

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Date: Thu, 6 Jun 2024 17:52:50 -0700
From: Anjelique Melendez <quic_amelende@...cinc.com>
To: <pavel@....cz>, <lee@...nel.org>, <robh@...nel.org>,
        <andersson@...nel.org>, <quic_amelende@...cinc.com>
CC: <u.kleine-koenig@...gutronix.de>, <marijn.suijten@...ainline.org>,
        <kees@...nel.org>, <morf3089@...il.com>, <quic_gurus@...cinc.com>,
        <quic_subbaram@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] leds: rgb: leds-qcom-lpg: Add PPG check for setting/clearing PBS triggers

Currently, all LED LPG devices will call lpg_{set,clear}_pbs_trigger()
when setting brightness regardless of if they support PPG and have PBS
triggers. Check if device supports PPG before setting/clearing PBS
triggers.

Fixes: 6ab1f766a80a ("leds: rgb: leds-qcom-lpg: Add support for PPG through single SDAM")
Fixes: 5e9ff626861a ("leds: rgb: leds-qcom-lpg: Include support for PPG with dedicated LUT SDAM")
Signed-off-by: Anjelique Melendez <quic_amelende@...cinc.com>
---
 drivers/leds/rgb/leds-qcom-lpg.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
index 9467c796bd04..e74b2ceed1c2 100644
--- a/drivers/leds/rgb/leds-qcom-lpg.c
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -2,7 +2,7 @@
 /*
  * Copyright (c) 2017-2022 Linaro Ltd
  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
- * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2023-2024, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 #include <linux/bits.h>
 #include <linux/bitfield.h>
@@ -254,6 +254,9 @@ static int lpg_clear_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
 	u8 val = 0;
 	int rc;
 
+	if (!lpg->lpg_chan_sdam)
+		return 0;
+
 	lpg->pbs_en_bitmap &= (~lut_mask);
 	if (!lpg->pbs_en_bitmap) {
 		rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1, &val);
@@ -276,6 +279,9 @@ static int lpg_set_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
 	u8 val = PBS_SW_TRIG_BIT;
 	int rc;
 
+	if (!lpg->lpg_chan_sdam)
+		return 0;
+
 	if (!lpg->pbs_en_bitmap) {
 		rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1, &val);
 		if (rc < 0)
-- 
2.34.1