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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16922C41513 for ; Tue, 25 Jul 2023 11:22:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234452AbjGYLWs (ORCPT ); Tue, 25 Jul 2023 07:22:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234451AbjGYLWr (ORCPT ); Tue, 25 Jul 2023 07:22:47 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DE051BCB for ; Tue, 25 Jul 2023 04:22:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C83E56167D for ; Tue, 25 Jul 2023 11:22:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D73CEC433C7; Tue, 25 Jul 2023 11:22:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690284157; bh=ZYrG+cBJKda1IWaTWfYhAUhzyGMyNfFgMEdE5bGI8i0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Oo2ihcUxjZ1OlmIptiMn2/LapE6+b3ixyEq/PjgaAh3RgDNDd9HRkBppzccQT7HCN 1t+cekNAlfwzrjjD+T2hSzSWptGxOp5WyMKzykYU2ZnQ+2DPKwRWMEFnWHybqOYVti +wDID6raXYjWtjNaeZzCPHYmPTRssvcXQdAstd8E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Fancy Fang , Clark Wang , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Thierry Reding , Sasha Levin Subject: [PATCH 5.10 256/509] pwm: imx-tpm: force real_period to be zero in suspend Date: Tue, 25 Jul 2023 12:43:15 +0200 Message-ID: <20230725104605.466775429@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104553.588743331@linuxfoundation.org> References: <20230725104553.588743331@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Fancy Fang [ Upstream commit 661dfb7f46298e53f6c3deaa772fa527aae86193 ] During suspend, all the tpm registers will lose values. So the 'real_period' value of struct 'imx_tpm_pwm_chip' should be forced to be zero to force the period update code can be executed after system resume back. Signed-off-by: Fancy Fang Signed-off-by: Clark Wang Acked-by: Uwe Kleine-König Fixes: 738a1cfec2ed ("pwm: Add i.MX TPM PWM driver support") Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin --- drivers/pwm/pwm-imx-tpm.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index fcdf6befb8389..871527b78aa46 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -403,6 +403,13 @@ static int __maybe_unused pwm_imx_tpm_suspend(struct device *dev) if (tpm->enable_count > 0) return -EBUSY; + /* + * Force 'real_period' to be zero to force period update code + * can be executed after system resume back, since suspend causes + * the period related registers to become their reset values. + */ + tpm->real_period = 0; + clk_disable_unprepare(tpm->clk); return 0; -- 2.39.2