From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A86D4C4167B for ; Tue, 7 Nov 2023 12:30:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D902210E5BC; Tue, 7 Nov 2023 12:30:35 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2642C10E5BD for ; Tue, 7 Nov 2023 12:30:33 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 9ACAA61202; Tue, 7 Nov 2023 12:30:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E474EC433BD; Tue, 7 Nov 2023 12:30:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699360232; bh=uBZzQhHpQ7Rp989QrnAGxubC9P67wgEuGilulEME41E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Za5UgisG4K2VgRSphwbxhLZ4XtTXp87W+zvlOs3tKyTnpaW7w8U90bQ7FTS3PN5AW uDnr1CeVUssPjrQMmsOTRqGe0/KKowkjdwFV4lIHa1NayV6Z2NTVqHu2kCvNSHlBdq 2n9TrC0R01AsDL31nNEvZSBvdXVXeI5O2d2YZEIOHa45OK4EZeXLwvWwNIqnNCa5vK UBjlhBnL6RCj8UJ87GUh2S+7Vucd9+pblvFCqle/bb6BgiB0pOBIOTYA5oWaieaLSS 2ifZLbGjuJIJT72muedDWpHHymDjlHz0V4czNc0rK8O/W9gKQYYIo71ksHnO4TCYMg o0i9kyKiWzZdg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 16/20] drm/panel: st7703: Pick different reset sequence Date: Tue, 7 Nov 2023 07:29:10 -0500 Message-ID: <20231107122940.3762228-16-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107122940.3762228-1-sashal@kernel.org> References: <20231107122940.3762228-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.137 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , neil.armstrong@linaro.org, Samuel Holland , =?UTF-8?q?Guido=20G=C3=BCnther?= , Frank Oltmanns , mripard@kernel.org, Ondrej Jirman , dri-devel@lists.freedesktop.org, tzimmermann@suse.de Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Ondrej Jirman [ Upstream commit d12d635bb03c7cb4830acb641eb176ee9ff2aa89 ] Switching to a different reset sequence, enabling IOVCC before enabling VCC. There also needs to be a delay after enabling the supplies and before deasserting the reset. The datasheet specifies 1ms after the supplies reach the required voltage. Use 10-20ms to also give the power supplies some time to reach the required voltage, too. This fixes intermittent panel initialization failures and screen corruption during resume from sleep on panel xingbangda,xbd599 (e.g. used in PinePhone). Signed-off-by: Ondrej Jirman Signed-off-by: Frank Oltmanns Reported-by: Samuel Holland Reviewed-by: Guido Günther Tested-by: Guido Günther Signed-off-by: Guido Günther Link: https://patchwork.freedesktop.org/patch/msgid/20230211171748.36692-2-frank@oltmanns.dev Signed-off-by: Sasha Levin --- drivers/gpu/drm/panel/panel-sitronix-st7703.c | 25 ++++++++++--------- 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7703.c b/drivers/gpu/drm/panel/panel-sitronix-st7703.c index a2c303e5732c0..f50cc70e6337c 100644 --- a/drivers/gpu/drm/panel/panel-sitronix-st7703.c +++ b/drivers/gpu/drm/panel/panel-sitronix-st7703.c @@ -428,29 +428,30 @@ static int st7703_prepare(struct drm_panel *panel) return 0; dev_dbg(ctx->dev, "Resetting the panel\n"); - ret = regulator_enable(ctx->vcc); + gpiod_set_value_cansleep(ctx->reset_gpio, 1); + + ret = regulator_enable(ctx->iovcc); if (ret < 0) { - dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret); + dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); return ret; } - ret = regulator_enable(ctx->iovcc); + + ret = regulator_enable(ctx->vcc); if (ret < 0) { - dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret); - goto disable_vcc; + dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret); + regulator_disable(ctx->iovcc); + return ret; } - gpiod_set_value_cansleep(ctx->reset_gpio, 1); - usleep_range(20, 40); + /* Give power supplies time to stabilize before deasserting reset. */ + usleep_range(10000, 20000); + gpiod_set_value_cansleep(ctx->reset_gpio, 0); - msleep(20); + usleep_range(15000, 20000); ctx->prepared = true; return 0; - -disable_vcc: - regulator_disable(ctx->vcc); - return ret; } static int st7703_get_modes(struct drm_panel *panel, -- 2.42.0