From patchwork Mon Jan 23 16:06:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 13112529 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 5E87BC38142 for ; Mon, 23 Jan 2023 16:30:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=u64mIc1Gnk/nfVHUFq6LwDdDW2ZizF8uHVYCr+kRadM=; b=IEGKvm/gXSnXCn87epTK3Vu5z2 lvIM9Deiputi0BcHYvrwaD7+4aVCXpYvQn+h1/6vj771/wQjQiX1zad/ELypUn/gMpeDnxechk+qZ zR0mkfB1nAAvRXqGFzqwt09VtiOpf39W4sXH8YPYEgGCQ13BhJmv4teIQL5gZxex6xtSUPdiBiQdJ SRkHWsHexmeijeOMHIDH/sgo22Ln8uNP5gya3u+qrqxH1PPPbBxH2HcVoVGnwBqgxlG0SbaN5kYWJ Cme38MMQOy7XQq7WttOi22A6Wf8rNdasC14bxfqm6wAznoNd/7DLW4PfiDUWAnloy9PWqUfDpAaXk 60PxvL5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pJziI-000YJS-5q; Mon, 23 Jan 2023 16:30:30 +0000 Received: from madras.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e5ab]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pJzL5-000QGO-Jc; Mon, 23 Jan 2023 16:06:37 +0000 Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 5DDD86602E1B; Mon, 23 Jan 2023 16:06:21 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1674489982; bh=E4V4fApG7LhWq16TtQ6eUGLIDwf3PHKpT4N6BRwMD5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l5xAWlcWUx08oMvA/eWOdsbcrOR+U3pZbcBjQpt/BPWZXP/Z21nBhIWLQbkqj54c0 j/hIJ+LkGsFm01jMo7nggTEdPMsd3ONZ+oFesVc+Cp5dJNH3DBxKEYvRNhc6Hij8pI GMn1mEzBCzkS5MKjK9TiEqL02e2WKAA36WLo9LGBNmHjeVoCMcWE8sl7KotR/rQaj2 CVohRzLs3nQeKYqs7RQ45Dkq9NAlv1BOHhdcPFWZSDMbmsq7S4dVFQ/7RmDgZJvSHW 6Oy6JPzdJ3qATiOKqWVdKepRX3zTiOg2I5/U2IwXX+Lljt64IBiXYrky3h43JmRML+ rkLbhMIZuMJ/Q== From: AngeloGioacchino Del Regno To: thierry.reding@gmail.com Cc: u.kleine-koenig@pengutronix.de, matthias.bgg@gmail.com, weiqing.kong@mediatek.com, jitao.shi@mediatek.com, linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@collabora.com, AngeloGioacchino Del Regno Subject: [PATCH 1/2] pwm: mtk-disp: Disable shadow registers before setting backlight values Date: Mon, 23 Jan 2023 17:06:14 +0100 Message-Id: <20230123160615.375969-2-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230123160615.375969-1-angelogioacchino.delregno@collabora.com> References: <20230123160615.375969-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230123_080631_902597_25393174 X-CRM114-Status: GOOD ( 10.00 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org If shadow registers usage is not desired, disable that before performing any write to CON0/1 registers in the .apply() callback, otherwise we may lose clkdiv or period/width updates. Fixes: cd4b45ac449a ("pwm: Add MediaTek MT2701 display PWM driver support") Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Nícolas F. R. A. Prado Tested-by: Nícolas F. R. A. Prado --- drivers/pwm/pwm-mtk-disp.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index 692a06121b28..82b430d881a2 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -138,6 +138,19 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, high_width = mul_u64_u64_div_u64(state->duty_cycle, rate, div); value = period | (high_width << PWM_HIGH_WIDTH_SHIFT); + if (mdp->data->bls_debug && !mdp->data->has_commit) { + /* + * For MT2701, disable double buffer before writing register + * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH. + */ + mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug, + mdp->data->bls_debug_mask, + mdp->data->bls_debug_mask); + mtk_disp_pwm_update_bits(mdp, mdp->data->con0, + mdp->data->con0_sel, + mdp->data->con0_sel); + } + mtk_disp_pwm_update_bits(mdp, mdp->data->con0, PWM_CLKDIV_MASK, clk_div << PWM_CLKDIV_SHIFT); @@ -152,17 +165,6 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, mtk_disp_pwm_update_bits(mdp, mdp->data->commit, mdp->data->commit_mask, 0x0); - } else { - /* - * For MT2701, disable double buffer before writing register - * and select manual mode and use PWM_PERIOD/PWM_HIGH_WIDTH. - */ - mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug, - mdp->data->bls_debug_mask, - mdp->data->bls_debug_mask); - mtk_disp_pwm_update_bits(mdp, mdp->data->con0, - mdp->data->con0_sel, - mdp->data->con0_sel); } mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,