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 E6FF6CA5FCE for ; Sun, 4 Oct 2026 15:31:19 +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-Type: Content-Transfer-Encoding:Reply-To:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:References:Cc:To:Subject: From:MIME-Version:Date:Message-ID:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZdCReVP0OoZP6HWMRW1kKaHSZjYkLmXjPOiqpsGfMwg=; b=moDcqHd+nzDLSUWKNYP+WtOXcT S7d8RcGdXBrmtRxz9ZnyzVe/Zq+d3KXAc0T5FTmF+whdJ+s9SO4A1X1BvM8mfLU31geTCwBCCI7aj /xr2uHCuVh/SqmGhaZGbRgb2F1kQdpmYo3EMk17ZnKD01PqyRmn6hQ+07LZSaFzuHEGEcjJVjfjMB a/twpnY132T5fh1eL+Jf2LXvNiBHeOe7Jo8x2BPSIBihzN7AV+OhdbBnpVHfEMgPsfEhpygwl0Jpw q1PkwmBZyasIpoC84OaL62owULxKjG59DtLNOzWIdo8lx5jMMCjRTD4nks+0Ag0caYCmO3rt1DA22 A3bXvWLQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xDOBD-0000000EzkS-0JWk; Sun, 04 Oct 2026 15:31:16 +0000 Received: from mail-wm1-x335.google.com ([2a00:1450:4864:20::335]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xDOBA-0000000Ezjo-3ulm for linux-amlogic@lists.infradead.org; Sun, 04 Oct 2026 15:31:10 +0000 Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-4a1728d8dfcso190265e9.1 for ; Sun, 04 Oct 2026 08:31:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1791127867; x=1791732667; darn=lists.infradead.org; h=content-transfer-encoding:content-type:in-reply-to:organization :autocrypt:content-language:references:cc:to:subject:reply-to:from :user-agent:mime-version:date:message-id:from:to:cc:subject:date :message-id:reply-to:content-type; bh=A8UQiiW/gzilrgvSzhDTIjzX+BX5W1JZdipDo+7xtF0=; b=ve/u1JEEBQa0Zx6eCDuLPhD9uQsrYBUGq9qlIFBntcgPpG/Jemz+RsscNDsA+v7pIX hvNPkGY9elAEtcGnBBm8c9Z/tJRAFn/0YjR6wLSFUdGVVSgrlHRSCi1TCzOo2e2A0nso p99ortwUAnULTOafCha2dF6IG35tA0+7Uu0kfVJInb8SVJUWAPnnipGOGSvmwQC1qzvn gFPssad+YnLM1kJXNQXYYiHXUaMpexWdD3ssRCd6rkIyRAZo5CTNtgOpFUjrISVI6dUB tYoCkneN4sjrp+yT7PKk3P1G1s4jfDB317vo6Xr67hsk/qrmZlhFhzHpgYthfVCQxu0Y 18kQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791127867; x=1791732667; h=content-transfer-encoding:content-type:in-reply-to:organization :autocrypt:content-language:references:cc:to:subject:reply-to:from :user-agent:mime-version:date:message-id:x-gm-gg:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to:content-type; bh=A8UQiiW/gzilrgvSzhDTIjzX+BX5W1JZdipDo+7xtF0=; b=E2pU55NWJPbJqoWq8Pk/gLTQshft+cahWxY5nLqCDoLlPlpJHlO6PXgAvRmaEsl0lp xSL0b+Xuc8kzvDWnvW1OKNybveDJjms1qxaUnkIPtifPwApzivH5ViwgBHltMRhpXwKd ktRPyvF1pKRJ48QFMUFP0mhrSnXWYVThfV95z4N42TedDdtctRzZIEnKUEPh/VdBWf5g 3LqwtYKlT6opyaeF8E8cAYKTWQnc9pe0yGZYQ1lEVnFJRnQd5Vb17Foaj7E5UxLoofDS 3CbE3/t79eH8vN8k+WtAvzuBA0BvxKBuVCVMnZlb/GTQbXiVcyc2pNZTxHCqykhgWVdv 7k7w== X-Forwarded-Encrypted: i=1; AKwUvBwFuuGHV/a0+6mERvCCg2krEyDcZ1Jz+aiwxOhsNbAPMqwTnofUvZqS4YOhf7KovRHcfBOCd2SgGq2CocCb@lists.infradead.org X-Gm-Message-State: AFuF++kuITzCu2cz0qkold+VxbH0AMrvmxQMgXcg5PSGenULyBr8L02u zvnSVdVpV2CiAfk3RNLeO8EgMwgxxT3cfj0B2+1HG31atCxMW2WhQNMLVO9RIWG5kJU= X-Gm-Gg: AYBFou2KpdHIeU7Gm9J9gV6D7S6+wxBfkl2iLG8xMHmrcaeEg1EYKztZasdY17+1HvT Qhr0tjUNTlRX0qyZN7Q1GGjZPkf1BkE2jLLX66b5KMU4D5qPuF/qzhvmWk106z3eD6AAUj8sVL5 NodGay+JlYtPmYQZpdz6daBfeYjkDs/csqh8aUJZ9XiKcjvUYvmvGCkxEy9xQj/sf1qTkFBAVbO Hmi7MM6N00N8IcdEgnGrL1TrYtNmWMA0f+VmcScyTp6Yzy/BM8BbPAhEYhFt1x5kPAsejs2WMCY mYMOuoACUPz7TW9QltB7ptSJbaF/rt+5OxpYUbAYu0Fd/WQVlt4bnu0KwLiNZTz82Gdo/eQFR+s FHVKrk+RltN7d9ST7XMc6vG1SEZqExZdEXZBSHpMyQczx7Nb2s/j0mCLBocXBufFB5gWfgp2iwN ikzpdVTZ6XhK0UZihP6+FNgGldLqcwWE91OmqI+iYCHGhkzwxobPgB5s3raJq9d/H2oabAh+59f stLJdDC X-Received: by 2002:a05:600c:3103:b0:4a0:1feb:de6a with SMTP id 5b1f17b1804b1-4a1680fd804mr74504535e9.30.1791127866831; Sun, 04 Oct 2026 08:31:06 -0700 (PDT) Received: from [172.20.10.3] ([37.169.53.153]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a027741586sm262949745e9.14.2026.10.04.08.31.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 04 Oct 2026 08:31:05 -0700 (PDT) Message-ID: <022f5372-7963-41b1-ba76-2d89c51aa8c6@linaro.org> Date: Sun, 4 Oct 2026 17:31:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [PATCH] drm/meson: encoder_dsi: load ENCL gamma table while ENCL is disabled To: y-asai.0816@docomonet.jp, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Nicolas Belin , Jagan Teki Cc: dri-devel@lists.freedesktop.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, John Williams References: <20261004-meson-gamma-v1-1-6347558e2bb3@docomonet.jp> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20261004-meson-gamma-v1-1-6347558e2bb3@docomonet.jp> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261004_083109_020590_2665C4BF X-CRM114-Status: GOOD ( 21.17 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 10/4/26 16:50, Shigeaki Asai via B4 Relay wrote: > From: Shigeaki Asai > > meson_encoder_dsi_atomic_enable() programmed the ENCL gamma LUT right > after meson_venc_mipi_dsi_mode_set(), i.e. while the ENCL timing > generator was already running (ENCL_VIDEO_EN=1). Writing the LUT > during active video stalls the hardware: L_GAMMA_CNTL_PORT > WR_RDY/ADR_RDY deassert and the ENCL line counter (ENCL_INFO_READ) > freezes, so every remaining write times out (~8s total at boot) and > the panel ends up with a corrupted gamma table (wrong colors). > > Instrumented boots on the ODROID-GO Ultra (S922X) show: > > failing: start: VIDEO_EN=1 INFO 0000001a->002d0000 GAMMA_CNTL=00000030 > stall: INFO 002d0000->002d0000 GAMMA_CNTL=00000000 > (VID_CLK_CNTL2 / VIID_CLK_CNTL / VIID_CLK_DIV unchanged, > i.e. the ENCL clock is still running) > fixed: start: VIDEO_EN=0 INFO 00000000->00000000 GAMMA_CNTL=00000030 > no stall, no timeout > > Whether it failed depended only on timing, which is why enabling > lock debugging (LOCKDEP etc.) appeared to "fix" it most of the time. > It happens regardless of the bootloader (mainline or Hardkernel vendor > U-Boot). > > The function already writes ENCL_VIDEO_EN=0 right afterwards before > re-enabling the encoder, so simply move meson_encl_load_gamma() after > that write. This matches the order used by the vendor U-Boot's own LCD > driver, which never times out. > > Tested on the ODROID-GO Ultra with mainline U-Boot: 5 cold boots + > 3 warm reboots, no timeouts, correct colors, LOCKDEP disabled. > > Fixes: 42dcf15f901c ("drm/meson: add DSI encoder") > Cc: stable@vger.kernel.org > Tested-by: John Williams > Signed-off-by: Shigeaki Asai > --- > This was found on the ODROID-GO Ultra while bringing it up on > Lakka / ROCKNIX. Happy to test any alternative approach. > --- > drivers/gpu/drm/meson/meson_encoder_dsi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/meson/meson_encoder_dsi.c b/drivers/gpu/drm/meson/meson_encoder_dsi.c > index faa309cb97a6..912cd676bbe2 100644 > --- a/drivers/gpu/drm/meson/meson_encoder_dsi.c > +++ b/drivers/gpu/drm/meson/meson_encoder_dsi.c > @@ -65,9 +65,9 @@ static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge, > /* ENCL clock setup is handled by CCF */ > > meson_venc_mipi_dsi_mode_set(priv, &crtc_state->adjusted_mode); > - meson_encl_load_gamma(priv); > > writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN)); > + meson_encl_load_gamma(priv); > > writel_bits_relaxed(ENCL_VIDEO_MODE_ADV_VFIFO_EN, ENCL_VIDEO_MODE_ADV_VFIFO_EN, > priv->io_base + _REG(ENCL_VIDEO_MODE_ADV)); > > --- > base-commit: 70456f05d4b6396b22048c4b8cd3cb98ecf9f9e3 > change-id: 20261004-meson-gamma-3306257c0d28 > > Best regards, > -- > Shigeaki Asai Thanks for figuring this out ! Reviewed-by: Neil Armstrong Thanks, Neil _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic