From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1F6C76FA7 for ; Sun, 17 Sep 2023 20:16:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82BC3C433C8; Sun, 17 Sep 2023 20:16:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1694981771; bh=AlXt6GNWNpbiS8Pk0BDfknoSZiALMXK3CCv0XIPyBFw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zwiX/Xs6CkDEVEduDP1Pbxu18ArNJBWIQA9nnUzpZkuhmQzw27Q4Gy89/07r+GN5Q QJCkrIaZzQYjV/Z3BtJVJC+IMVllQw9OwAEdWa4wDFyA+JsianAHt4/bf6tROr3uZK aWQ9m4w+mjWsIjYhl68n6PQiASADKyY3xVDbx38k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Fainelli , Herbert Xu , Sasha Levin Subject: [PATCH 5.15 104/511] hwrng: iproc-rng200 - Implement suspend and resume calls Date: Sun, 17 Sep 2023 21:08:51 +0200 Message-ID: <20230917191116.375512959@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230917191113.831992765@linuxfoundation.org> References: <20230917191113.831992765@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Fainelli [ Upstream commit 8e03dd62e5be811efbf0cbeba47e79e793519105 ] Chips such as BCM7278 support system wide suspend/resume which will cause the HWRNG block to lose its state and reset to its power on reset register values. We need to cleanup and re-initialize the HWRNG for it to be functional coming out of a system suspend cycle. Fixes: c3577f6100ca ("hwrng: iproc-rng200 - Add support for BCM7278") Signed-off-by: Florian Fainelli Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/char/hw_random/iproc-rng200.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index a43743887db19..9142a63b92b30 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -189,6 +189,8 @@ static int iproc_rng200_probe(struct platform_device *pdev) return PTR_ERR(priv->base); } + dev_set_drvdata(dev, priv); + priv->rng.name = "iproc-rng200"; priv->rng.read = iproc_rng200_read; priv->rng.init = iproc_rng200_init; @@ -206,6 +208,28 @@ static int iproc_rng200_probe(struct platform_device *pdev) return 0; } +static int __maybe_unused iproc_rng200_suspend(struct device *dev) +{ + struct iproc_rng200_dev *priv = dev_get_drvdata(dev); + + iproc_rng200_cleanup(&priv->rng); + + return 0; +} + +static int __maybe_unused iproc_rng200_resume(struct device *dev) +{ + struct iproc_rng200_dev *priv = dev_get_drvdata(dev); + + iproc_rng200_init(&priv->rng); + + return 0; +} + +static const struct dev_pm_ops iproc_rng200_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(iproc_rng200_suspend, iproc_rng200_resume) +}; + static const struct of_device_id iproc_rng200_of_match[] = { { .compatible = "brcm,bcm2711-rng200", }, { .compatible = "brcm,bcm7211-rng200", }, @@ -219,6 +243,7 @@ static struct platform_driver iproc_rng200_driver = { .driver = { .name = "iproc-rng200", .of_match_table = iproc_rng200_of_match, + .pm = &iproc_rng200_pm_ops, }, .probe = iproc_rng200_probe, }; -- 2.40.1