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 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 06614C433EF for ; Thu, 17 Feb 2022 14:30:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BwggPwPYhmjb0p82g1YId0UfmeC8n8i9gMhfYPWvrkM=; b=DLy5XUXK5r20Vs iGEMtISLRpBUU3NI4ZveTEMtbEUFZLbryyEPvj3g0bRcdfJkyA+etwzYLGnnI8cYW7gh0YTf+TEPr p53mOuT+QYcytqIuNghFoGMS/GpsXx/2gpSdJkTLYCfTpfdtPqDUxsmP7sg0xyngCx+kplJfwSNy0 fgkrPQYxSPOHmq8y0a9Uz4Py8ZUcz9oNSModdUJefTIPPoD9DHx8gDPb5VCGTy6r+TNmbZ2tQEINo 2PK7oa6ynwa7r0PwXU7ia2wvFfxj0utnV37L0nWnFPCdS1aIu0RxS6wz1bw1f97nWZCyAMFmGIHt5 0oSvVtV307Cy2tc9aa/g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nKhlu-00B0ze-Dk; Thu, 17 Feb 2022 14:28:38 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nKhQM-00As5r-C7; Thu, 17 Feb 2022 14:06:24 +0000 Received: from ip5b412258.dynamic.kabel-deutschland.de ([91.65.34.88] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nKhQG-0006ci-1D; Thu, 17 Feb 2022 15:06:16 +0100 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Andy Yan , Sascha Hauer Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, kernel@pengutronix.de, Benjamin Gaignard , Michael Riesch , Sandy Huang , Peter Geis Subject: Re: [PATCH v6 21/23] drm: rockchip: Add VOP2 driver Date: Thu, 17 Feb 2022 15:06:15 +0100 Message-ID: <6072461.kR79ftKOrO@diego> In-Reply-To: <20220217135823.GR18637@pengutronix.de> References: <20220217082954.2967889-1-s.hauer@pengutronix.de> <20220217135823.GR18637@pengutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220217_060622_505340_3EA26BF8 X-CRM114-Status: GOOD ( 29.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Am Donnerstag, 17. Februar 2022, 14:58:23 CET schrieb Sascha Hauer: > Hi Andy, > > Please trim the context in your answers to the relevant parts, it makes > it easier to find the things you said. > > On Thu, Feb 17, 2022 at 08:00:11PM +0800, Andy Yan wrote: > > Hi Sascha: > > > > > + > > > + drm_for_each_encoder_mask(encoder, crtc->dev, crtc_state->encoder_mask) { > > > + struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder); > > > + struct device_node *node, *parent; > > > + > > > + parent = of_get_parent(rkencoder->port); > > > + > > > + for_each_endpoint_of_node(parent, node) { > > > > Is there any hurt directly use our downstream vendor kernel method here: use > > vcstate->output_if set by encoder driver to get which interface we should > > enable here? > > There is no vcstate->output_if in mainline currently. Ok, we could add > that. The other thing is that there are multiple HDMI interfaces and > the id of the HDMI encoder is encoded into output_if. Downstream kernel > adds OF aliases to the HDMI ports. I didn't want to go that route > because it doesn't seem to be very elegant to me. > > > > > You method is ok with device tree, but it tied up this driver to device > > tree, we are now tring to extend vop2 driver work with ACPI, so we hope this > > driver can be much more flexible. > > The current rockchip drm driver seems to be pretty much tied to device > tree. There are probably many other places that need parallel paths for > ACPI support, I think we can delay this particular part until we see the > whole picture. In the end we can still retrieve the output_if > information differently with ACPI while still retrieving the information > from the device tree the way we are doing currently. agreed :-) . I.e. adding ACPI support for Rockchip drivers separately later on makes things way easier. Having a separate discussion about ACPI changes at that point also makes the whole process easier, as adding the whole thing here will delay everything even more. Also if a later series really only is about adding ACPI support, this makes for easier discussion but also easier review of changes. The new VOP2 driver is big enough as it is. Heiko _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel