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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 784E0C10F13 for ; Thu, 11 Apr 2019 11:15:31 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 3DE472084D for ; Thu, 11 Apr 2019 11:15:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dLbrRNkn" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3DE472084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=G8j+GCWnEkr+zSEu/Zunz4yaijC/rD+PzuES8md6LoQ=; b=dLbrRNknsEZCrV OYkFRN6hOLga+s2eWysVMCC9iB9BSgFDfrjWNLq1jl/5J2NScbdTawn9R3RrvGc4WkQHphdh0EJUU 2aDscK5FidMtQzSaRpEX2+U5TZSjLvYascnLcBiEfa7aaaY6n3Ue6bg5CpM4NM3wFfXUoy4viRV4C /z6oHLwmcZl61llroxVl7XUlutlXDQH6UuLvMNalq/z/j8pQdDK+en89f5qpEltiLd0AouoS4V819 FYY7Vg3QPAKryoTiAoHklfmuQEEaOYDTOd2PAd0E+ZNnpfD84TzDnyYDGjhl7eGsA032U3/Hp30rG yVDJNM64wTxT66oGxPOw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEXg1-0001x9-Ou; Thu, 11 Apr 2019 11:15:29 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEXfx-0001wM-Qu; Thu, 11 Apr 2019 11:15:28 +0000 X-UUID: d3086cd55c67435996608b8f875df80f-20190411 X-UUID: d3086cd55c67435996608b8f875df80f-20190411 Received: from mtkcas68.mediatek.inc [(172.29.94.19)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1426821715; Thu, 11 Apr 2019 03:15:22 -0800 Received: from MTKMBS01N2.mediatek.inc (172.21.101.79) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 11 Apr 2019 04:15:21 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 11 Apr 2019 19:15:19 +0800 Received: from [172.21.77.4] (172.21.77.4) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 11 Apr 2019 19:15:19 +0800 Message-ID: <1554981319.31170.2.camel@mtksdaap41> Subject: Re: [PATCH v2 16/25] drm/mediatek: add ddp write register common api From: CK Hu To: Date: Thu, 11 Apr 2019 19:15:19 +0800 In-Reply-To: <1553667561-25447-17-git-send-email-yongqiang.niu@mediatek.com> References: <1553667561-25447-1-git-send-email-yongqiang.niu@mediatek.com> <1553667561-25447-17-git-send-email-yongqiang.niu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 4E69FC553BCEE32A74450CFBB64481A06BC9D0C54E487B007EA3E378B139BF762000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190411_041525_877548_E4934375 X-CRM114-Status: GOOD ( 13.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, Bibby.Hsieh@mediatek.com, airlied@linux.ie, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, yt.shen@mediatek.com, robh+dt@kernel.org, linux-mediatek@lists.infradead.org, p.zabel@pengutronix.de, matthias.bgg@gmail.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Yongqiang: On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@mediatek.com wrote: > From: Yongqiang Niu > > This patch add ddp write register common api > this is preparation patch for ovl/ovl_2l direct link > usecase. > in that case, we need this funtion to set one bit of ovl_2l > register The reason is so strange. You could grep 'readl' in mediatek drm driver, and you would find that many place need this function. > > Signed-off-by: Yongqiang Niu > --- > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 11 +++++++++++ > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 4 ++++ > 2 files changed, 15 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > index afd6ca2..72288b4 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c > @@ -84,6 +84,17 @@ > #define DITHER_ADD_LSHIFT_G(x) (((x) & 0x7) << 4) > #define DITHER_ADD_RSHIFT_G(x) (((x) & 0x7) << 0) > > +void mtk_ddp_write_mask(unsigned int value, > + struct mtk_ddp_comp *comp, > + unsigned int offset, > + unsigned int mask) > +{ > + unsigned int tmp = readl(comp->regs + offset); > + > + tmp = (tmp & ~mask) | (value & mask); Why not just place this calculation into writel()? Regards, CK > + writel(tmp, comp->regs + offset); > +} > + > void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc, > unsigned int CFG) > { > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > index 20e8061..ed715ff 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h > @@ -198,5 +198,9 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node, > void mtk_ddp_comp_unregister(struct drm_device *drm, struct mtk_ddp_comp *comp); > void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc, > unsigned int CFG); > +void mtk_ddp_write_mask(unsigned int value, > + struct mtk_ddp_comp *comp, > + unsigned int offset, > + unsigned int mask); > > #endif /* MTK_DRM_DDP_COMP_H */ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel