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Received: from relay7-d.mail.gandi.net ([217.70.183.200]) by merlin.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hXlIt-0002Wt-Q4 for linux-arm-kernel@lists.infradead.org; Mon, 03 Jun 2019 11:39:05 +0000 X-Originating-IP: 90.88.144.139 Received: from localhost (aaubervilliers-681-1-24-139.w90-88.abo.wanadoo.fr [90.88.144.139]) (Authenticated sender: maxime.ripard@bootlin.com) by relay7-d.mail.gandi.net (Postfix) with ESMTPSA id C3B3D20014; Mon, 3 Jun 2019 11:38:27 +0000 (UTC) Date: Mon, 3 Jun 2019 13:38:27 +0200 From: Maxime Ripard To: Jernej Skrabec Subject: Re: [PATCH 1/7] media: cedrus: Disable engine after each slice decoding Message-ID: <20190603113827.2nmm5wkycf44aqox@flea> References: <20190530211516.1891-1-jernej.skrabec@siol.net> <20190530211516.1891-2-jernej.skrabec@siol.net> MIME-Version: 1.0 In-Reply-To: <20190530211516.1891-2-jernej.skrabec@siol.net> User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190603_073903_948675_00144450 X-CRM114-Status: GOOD ( 11.77 ) 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: devel@driverdev.osuosl.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, paul.kocialkowski@bootlin.com, wens@csie.org, mchehab@kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: multipart/mixed; boundary="===============8844744339296553413==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============8844744339296553413== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="jzwau3t2b77xs3xp" Content-Disposition: inline --jzwau3t2b77xs3xp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, On Thu, May 30, 2019 at 11:15:10PM +0200, Jernej Skrabec wrote: > libvdpau-sunxi always disables engine after each decoded slice. > Do same in Cedrus driver. > > Presumably this also lowers power consumption which is always nice. > > Signed-off-by: Jernej Skrabec Is it fixing anything though? I indeed saw that cedar did disable it everytime, but I couldn't find a reason why. Also, the power management improvement would need to be measured, it can even create the opposite situation where the device will draw more current from being woken up than if it had just remained disabled. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --jzwau3t2b77xs3xp Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXPUGswAKCRDj7w1vZxhR xcoOAP9mzllurMZRL+0rmJfj1Ie1ewdM8HeuqLiB1e/Mm8M0VQD/ULwrfBAx5fRS /tgzkYR2nXRMpj0jQ6+7xa2pyZdkdw0= =lu1j -----END PGP SIGNATURE----- --jzwau3t2b77xs3xp-- --===============8844744339296553413== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============8844744339296553413==--