From patchwork Thu Mar 31 19:37:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Dufresne X-Patchwork-Id: 12797645 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 A8D17C433FE for ; Thu, 31 Mar 2022 19:38:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240747AbiCaTkC (ORCPT ); Thu, 31 Mar 2022 15:40:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240905AbiCaTjw (ORCPT ); Thu, 31 Mar 2022 15:39:52 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4859223DE96; Thu, 31 Mar 2022 12:37:54 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: nicolas) with ESMTPSA id E968B1F47255 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1648755473; bh=jjxmbWJ+OUjcuFBbFVuZBkezVddHPzPh9O3QIqvsczU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RwGxqDjb0z4nPRaKXOOXYxg8RTqfoEsVbLNoGTKoOzPLv3hNGVnc6HLxlP8mSG/at AG+QmqMCODgEoABnKum4nYnaByGjFVNYW9dBw7IJgMjmfBhD0NhgMaJ8pAlPcT82zP Lz6kwWHhO7YdLQTjpqVWuhsRwi8Rr6Kjs+wCzmoD0UcTv4MHn5PhDy+oDM6nGn0+V/ 7OmMUW8v0byfOjG9iiJxlykixdc7+5gDkU7MslxNYsodoOqffxM6OlJAO1R0yAIqbt jSXOE3Vpj9rhLG/RDjJMIHnxY/W5m2zWng9BLDkBqpkfSBD3ZApYKpfDusZaPnYtcs hjn1fjNYR0I2A== From: Nicolas Dufresne To: Ezequiel Garcia , Mauro Carvalho Chehab , Greg Kroah-Hartman Cc: kernel@collabora.com, Sebastian Fricke , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 12/23] media: rkvdec: Stop overclocking the decoder Date: Thu, 31 Mar 2022 15:37:14 -0400 Message-Id: <20220331193726.289559-13-nicolas.dufresne@collabora.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220331193726.289559-1-nicolas.dufresne@collabora.com> References: <20220331193726.289559-1-nicolas.dufresne@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org While this overclock hack seems to work on some implementations (some ChromeBooks, RockPi4) it also causes instability on other implementations (notably LibreComputer Renegade, but there were more reports in the LibreELEC project, where this has been removed). While performance is indeed affected (tested with GStreamer), 4K playback still works as long as you don't operate in lock step and keep at least 1 frame ahead of time in the decode queue. After discussion with ChromeOS members, it would seem that their implementation indeed used to synchronously decode each frames, so this hack was simply compensating for their code being less efficient. In my opinion, this hack should not have been included upstream. Signed-off-by: Nicolas Dufresne Reviewed-by: Sebastian Fricke Reviewed-by: Ezequiel Garcia --- drivers/staging/media/rkvdec/rkvdec.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c index c0cf3488f970..2df8cf4883e2 100644 --- a/drivers/staging/media/rkvdec/rkvdec.c +++ b/drivers/staging/media/rkvdec/rkvdec.c @@ -1027,12 +1027,6 @@ static int rkvdec_probe(struct platform_device *pdev) if (ret) return ret; - /* - * Bump ACLK to max. possible freq. (500 MHz) to improve performance - * When 4k video playback. - */ - clk_set_rate(rkvdec->clocks[0].clk, 500 * 1000 * 1000); - rkvdec->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(rkvdec->regs)) return PTR_ERR(rkvdec->regs);