Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:1 as permitted sender) client-ip=2620:137:e000::3:1;
From:   Dmitry Rokosov <ddrokosov@salutedevices.com>
To:     <lee@kernel.org>, <pavel@ucw.cz>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
        <andy.shevchenko@gmail.com>
CC:     <kernel@sberdevices.ru>, <rockosov@gmail.com>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-leds@vger.kernel.org>,
        George Stark <gnstark@salutedevices.com>,
        Dmitry Rokosov <ddrokosov@salutedevices.com>
Subject: [PATCH v2 06/11] leds: aw200xx: add delay after software reset
Date:   Wed, 18 Oct 2023 21:29:38 +0300
Message-ID: <20231018182943.18700-7-ddrokosov@salutedevices.com>
In-Reply-To: <20231018182943.18700-1-ddrokosov@salutedevices.com>
References: <20231018182943.18700-1-ddrokosov@salutedevices.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
Precedence: bulk

From: George Stark <gnstark@salutedevices.com>

According to datasheets of aw200xx devices software reset takes at
least 1 ms so add delay after reset before issuing commands to device.

Signed-off-by: George Stark <gnstark@salutedevices.com>
Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
---
 drivers/leds/leds-aw200xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c
index a2a31b8e623e..77760406abbf 100644
--- a/drivers/leds/leds-aw200xx.c
+++ b/drivers/leds/leds-aw200xx.c
@@ -321,6 +321,9 @@ static int aw200xx_chip_reset(const struct aw200xx *const chip)
 	if (ret)
 		return ret;
 
+	/* according to datasheet software reset takes at least 1 ms */
+	fsleep(1000);
+
 	regcache_mark_dirty(chip->regmap);
 	return regmap_write(chip->regmap, AW200XX_REG_FCD, AW200XX_FCD_CLEAR);
 }
-- 
2.36.0