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From:   John Watts <contact@jookia.org>
To:     dri-devel@lists.freedesktop.org
Cc:     Neil Armstrong <neil.armstrong@linaro.org>,
        Jessica Zhang <quic_jesszhan@quicinc.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Chris Morgan <macromorgan@hotmail.com>,
        Jagan Teki <jagan@edgeble.ai>, John Watts <contact@jookia.org>,
        Paul Cercueil <paul@crapouillou.net>,
        Christophe Branchereau <cbranchereau@gmail.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH v2 3/9] drm/panel: nv3052c: Sleep for 150ms after reset
Date:   Mon, 18 Sep 2023 22:58:47 +1000
Message-ID: <20230918125853.2249187-4-contact@jookia.org>
In-Reply-To: <20230918125853.2249187-1-contact@jookia.org>
References: <20230918125853.2249187-1-contact@jookia.org>
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The current code waits after resets for 5 to 20 milliseconds.
This is appropriate when resetting a sleeping panel, but an awake panel
requires at least 120ms of waiting.

Sleep for 150ms so the panel always completes it reset properly.

Signed-off-by: John Watts <contact@jookia.org>
---
 drivers/gpu/drm/panel/panel-newvision-nv3052c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
index 90dea21f9856..2526b123b1f5 100644
--- a/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
+++ b/drivers/gpu/drm/panel/panel-newvision-nv3052c.c
@@ -258,7 +258,7 @@ static int nv3052c_prepare(struct drm_panel *panel)
 	gpiod_set_value_cansleep(priv->reset_gpio, 1);
 	usleep_range(10, 1000);
 	gpiod_set_value_cansleep(priv->reset_gpio, 0);
-	usleep_range(5000, 20000);
+	msleep(150);
 
 	for (i = 0; i < ARRAY_SIZE(nv3052c_panel_regs); i++) {
 		err = mipi_dbi_command(dbi, nv3052c_panel_regs[i].cmd,
-- 
2.42.0