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[71.197.186.152]) by smtp.gmail.com with ESMTPSA id l186sm515055pge.31.2019.12.09.14.03.42 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 09 Dec 2019 14:03:43 -0800 (PST) From: Kevin Hilman To: Neil Armstrong , dri-devel@lists.freedesktop.org Subject: Re: [PATCH v2 0/3] drm/meson: implement RDMA for AFBC reset on vsync In-Reply-To: <20191017094826.21552-1-narmstrong@baylibre.com> References: <20191017094826.21552-1-narmstrong@baylibre.com> Date: Mon, 09 Dec 2019 14:03:42 -0800 Message-ID: <7hpngxrwap.fsf@baylibre.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191209_140345_105586_FD97854C X-CRM114-Status: UNSURE ( 9.41 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Neil Armstrong Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org Neil Armstrong writes: > The VPU embeds a "Register DMA" that can write a sequence of registers > on the VPU AHB bus, either manually or triggered by an internal IRQ > event like VSYNC or a line input counter. > > The initial implementation handles a single channel (over 8), triggered > by the VSYNC irq and does not handle the RDMA irq. > > The RDMA will be usefull to reset and program the AFBC decoder unit > on each vsync without involving the interrupt handler that can > be masked for a long period of time, producing display glitches. > > For this we use the meson_rdma_writel_sync() which adds the register > write tuple (VPU register offset and register value) to the RDMA buffer > and write the value to the HW. > > When enabled, the RDMA is enabled to rewritte the same sequence at the > next VSYNC event, until a new buffer is committed to the OSD plane. > > The the Amlogic G12A is switched to RDMA, the Amlogic GXM Decoder > doesn't need a reset/reprogram at each vsync. > > Changes since v1 at [1]: > - Fixed a regression when AFBC was not used, adding a reset() call for the afbc module > - Added a define for the RDMA descriptor size > - Fixed overflow detection Reviewed-by: Kevin Hilman _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic 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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 64265C43603 for ; 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[71.197.186.152]) by smtp.gmail.com with ESMTPSA id l186sm515055pge.31.2019.12.09.14.03.42 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 09 Dec 2019 14:03:43 -0800 (PST) From: Kevin Hilman To: Neil Armstrong , dri-devel@lists.freedesktop.org Subject: Re: [PATCH v2 0/3] drm/meson: implement RDMA for AFBC reset on vsync In-Reply-To: <20191017094826.21552-1-narmstrong@baylibre.com> References: <20191017094826.21552-1-narmstrong@baylibre.com> Date: Mon, 09 Dec 2019 14:03:42 -0800 Message-ID: <7hpngxrwap.fsf@baylibre.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191209_140345_105125_5B151063 X-CRM114-Status: GOOD ( 10.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Neil Armstrong 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 Neil Armstrong writes: > The VPU embeds a "Register DMA" that can write a sequence of registers > on the VPU AHB bus, either manually or triggered by an internal IRQ > event like VSYNC or a line input counter. > > The initial implementation handles a single channel (over 8), triggered > by the VSYNC irq and does not handle the RDMA irq. > > The RDMA will be usefull to reset and program the AFBC decoder unit > on each vsync without involving the interrupt handler that can > be masked for a long period of time, producing display glitches. > > For this we use the meson_rdma_writel_sync() which adds the register > write tuple (VPU register offset and register value) to the RDMA buffer > and write the value to the HW. > > When enabled, the RDMA is enabled to rewritte the same sequence at the > next VSYNC event, until a new buffer is committed to the OSD plane. > > The the Amlogic G12A is switched to RDMA, the Amlogic GXM Decoder > doesn't need a reset/reprogram at each vsync. > > Changes since v1 at [1]: > - Fixed a regression when AFBC was not used, adding a reset() call for the afbc module > - Added a define for the RDMA descriptor size > - Fixed overflow detection Reviewed-by: Kevin Hilman _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 51227C43603 for ; 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[71.197.186.152]) by smtp.gmail.com with ESMTPSA id l186sm515055pge.31.2019.12.09.14.03.42 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 09 Dec 2019 14:03:43 -0800 (PST) From: Kevin Hilman To: Neil Armstrong , dri-devel@lists.freedesktop.org Subject: Re: [PATCH v2 0/3] drm/meson: implement RDMA for AFBC reset on vsync In-Reply-To: <20191017094826.21552-1-narmstrong@baylibre.com> References: <20191017094826.21552-1-narmstrong@baylibre.com> Date: Mon, 09 Dec 2019 14:03:42 -0800 Message-ID: <7hpngxrwap.fsf@baylibre.com> MIME-Version: 1.0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:in-reply-to:references:date:message-id :mime-version; bh=Jnouk4yF+4hDvyyaPMkAqTb9fke0cQ8rrhVPAJu3okw=; b=GlVceXA+0lC6uBPMxBHhwzUEVjOgob1HMGEBkW1gJjw56t4kv3Fz3LJxzxFL53GcCa RkzmEwY+SU/G2b9eFzkdrgUtuT0oRkyuL5EnRnLUHzFUZI4AOjvbksVw/I1Pt/FjaYS2 cPKnQZIulCAptVGoqm9Z3HgFSjhhD27yJILu6vTvSmbbIhRSHYSBe1gndsaULX8hZwKq RFa5Woj3cwn0MuO8JLgTkhrZytANWsosQ++XHOHxG736rzlWuSuNqiTmfBgHw7quSFvV sYprUpf24U+qTnfQ4f8gk9QrSFt1K65H2Y8+t/qtIFSPVKHPaqy+r1Ju5gjfR5BqUQf/ B1Mw== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Neil Armstrong Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" TmVpbCBBcm1zdHJvbmcgPG5hcm1zdHJvbmdAYmF5bGlicmUuY29tPiB3cml0ZXM6Cgo+IFRoZSBW UFUgZW1iZWRzIGEgIlJlZ2lzdGVyIERNQSIgdGhhdCBjYW4gd3JpdGUgYSBzZXF1ZW5jZSBvZiBy ZWdpc3RlcnMKPiBvbiB0aGUgVlBVIEFIQiBidXMsIGVpdGhlciBtYW51YWxseSBvciB0cmlnZ2Vy ZWQgYnkgYW4gaW50ZXJuYWwgSVJRCj4gZXZlbnQgbGlrZSBWU1lOQyBvciBhIGxpbmUgaW5wdXQg Y291bnRlci4KPgo+IFRoZSBpbml0aWFsIGltcGxlbWVudGF0aW9uIGhhbmRsZXMgYSBzaW5nbGUg Y2hhbm5lbCAob3ZlciA4KSwgdHJpZ2dlcmVkCj4gYnkgdGhlIFZTWU5DIGlycSBhbmQgZG9lcyBu b3QgaGFuZGxlIHRoZSBSRE1BIGlycS4KPgo+IFRoZSBSRE1BIHdpbGwgYmUgdXNlZnVsbCB0byBy ZXNldCBhbmQgcHJvZ3JhbSB0aGUgQUZCQyBkZWNvZGVyIHVuaXQKPiBvbiBlYWNoIHZzeW5jIHdp dGhvdXQgaW52b2x2aW5nIHRoZSBpbnRlcnJ1cHQgaGFuZGxlciB0aGF0IGNhbgo+IGJlIG1hc2tl ZCBmb3IgYSBsb25nIHBlcmlvZCBvZiB0aW1lLCBwcm9kdWNpbmcgZGlzcGxheSBnbGl0Y2hlcy4K Pgo+IEZvciB0aGlzIHdlIHVzZSB0aGUgbWVzb25fcmRtYV93cml0ZWxfc3luYygpIHdoaWNoIGFk ZHMgdGhlIHJlZ2lzdGVyCj4gd3JpdGUgdHVwbGUgKFZQVSByZWdpc3RlciBvZmZzZXQgYW5kIHJl Z2lzdGVyIHZhbHVlKSB0byB0aGUgUkRNQSBidWZmZXIKPiBhbmQgd3JpdGUgdGhlIHZhbHVlIHRv IHRoZSBIVy4KPgo+IFdoZW4gZW5hYmxlZCwgdGhlIFJETUEgaXMgZW5hYmxlZCB0byByZXdyaXR0 ZSB0aGUgc2FtZSBzZXF1ZW5jZSBhdCB0aGUKPiBuZXh0IFZTWU5DIGV2ZW50LCB1bnRpbCBhIG5l dyBidWZmZXIgaXMgY29tbWl0dGVkIHRvIHRoZSBPU0QgcGxhbmUuCj4KPiBUaGUgdGhlIEFtbG9n aWMgRzEyQSBpcyBzd2l0Y2hlZCB0byBSRE1BLCB0aGUgQW1sb2dpYyBHWE0gRGVjb2Rlcgo+IGRv ZXNuJ3QgbmVlZCBhIHJlc2V0L3JlcHJvZ3JhbSBhdCBlYWNoIHZzeW5jLgo+Cj4gQ2hhbmdlcyBz aW5jZSB2MSBhdCBbMV06Cj4gLSBGaXhlZCBhIHJlZ3Jlc3Npb24gd2hlbiBBRkJDIHdhcyBub3Qg dXNlZCwgYWRkaW5nIGEgcmVzZXQoKSBjYWxsIGZvciB0aGUgYWZiYyBtb2R1bGUKPiAtIEFkZGVk IGEgZGVmaW5lIGZvciB0aGUgUkRNQSBkZXNjcmlwdG9yIHNpemUKPiAtIEZpeGVkIG92ZXJmbG93 IGRldGVjdGlvbgoKUmV2aWV3ZWQtYnk6IEtldmluIEhpbG1hbiA8a2hpbG1hbkBiYXlsaWJyZS5j b20+Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1k ZXZlbCBtYWlsaW5nIGxpc3QKZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczov L2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbA==