From nobody Wed Dec 17 00:12:46 2025 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 E801EC77B7E for ; Sun, 23 Apr 2023 12:13:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230032AbjDWMNH (ORCPT ); Sun, 23 Apr 2023 08:13:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229799AbjDWMM7 (ORCPT ); Sun, 23 Apr 2023 08:12:59 -0400 Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0572310D3 for ; Sun, 23 Apr 2023 05:12:57 -0700 (PDT) Received: by mail-io1-xd2a.google.com with SMTP id ca18e2360f4ac-760ecf3424bso84125139f.2 for ; Sun, 23 Apr 2023 05:12:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682251976; x=1684843976; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=C3pPY9HtEOUAK4JXw4/vXoPtAe/9xi0JXRHIjuTfYXw=; b=gmvH94iI2m0GKZIajyYNPgxVP+S3TM1zQ35lnAgZhuIRabJdWMZTrvMYTvO5J1zcmh bFKUcJfddTNIHmMGE0D5ojK5Csx+Jwh/BFBXEYJB0OWgxtJVyAF5gr8WzN4c9dCTITLX 2sVWn2sHt8H/1xUfA65AJSuohQXMxN81a54EtcIldxBOvVulldqWC15Ja8rXePL9wDOg lBv6Dqs5geytGMtkxr1C3z7/P4EZm1KV7WSTgz0UqP5s0VUSShIkvV6J7dCE77/cEOI3 dUnIWCXZxO5zFHUcUZQLN+cuJ6Pm1q/SpW4gxvDIkyJmbDxtG19M0J0bs8xKId+nNT9x 0HWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682251976; x=1684843976; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=C3pPY9HtEOUAK4JXw4/vXoPtAe/9xi0JXRHIjuTfYXw=; b=ZYik/BMEvxfwW7GbJHW86NtWI3XXsSp2WIxOA9Mziqie60QIV2zznnyPN4+defZs24 KkUg1bOtWGGd/NOn+o9NOdE/Uxwi1k2OPqgHdeL14hzJjtetZDHdvUP0EcxRPlU4sU1t WZhZeaLvFr8Mi5XGMsW/H49icT04YvDZG7zZP2ilUrMk3PsV87up7/Rx8FJOBbjb056u Wl0tyW5EQvDnTIfFHGof6FCosCVEupWo8141rizvpAMBYpOcw4RfBcH08er/lX61tvZg Q7TmvKfbWOaK6hYOHkjLJeLlJstmnWk1g+F/SEtAGnRS5uTdD3DVGzZf2a4E8iSNDAIv JeCg== X-Gm-Message-State: AAQBX9cTxLsVjVRXptJXDFnp70YRGrEsorOrZqLQ/M+94KaZ1B8pZAZZ tvdHoJNYIQp+VhyQGdKm/9g= X-Google-Smtp-Source: AKy350a/O9W6zY3tjTMBeCg1ESutg2q3D+HvasDlLWjLo21snfZvgTbxN68OuUpeacv8kcMa5kVMRg== X-Received: by 2002:a5e:c709:0:b0:763:5ab7:a8ec with SMTP id f9-20020a5ec709000000b007635ab7a8ecmr3700527iop.12.1682251975744; Sun, 23 Apr 2023 05:12:55 -0700 (PDT) Received: from aford-B741.lan ([2601:447:d001:897f:b473:5d7c:4c2:75d7]) by smtp.gmail.com with ESMTPSA id u11-20020a02230b000000b00411a1373aa5sm1612155jau.155.2023.04.23.05.12.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Apr 2023 05:12:55 -0700 (PDT) From: Adam Ford To: dri-devel@lists.freedesktop.org Cc: m.szyprowski@samsung.com, aford@beaconembedded.com, dario.binacchi@amarulasolutions.com, l.stach@pengutronix.de, Adam Ford , Inki Dae , Jagan Teki , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Marek Vasut , linux-kernel@vger.kernel.org Subject: [PATCH V2 2/6] drm: bridge: samsung-dsim: Fix PMS Calculator on imx8m[mnp] Date: Sun, 23 Apr 2023 07:12:28 -0500 Message-Id: <20230423121232.1345909-3-aford173@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230423121232.1345909-1-aford173@gmail.com> References: <20230423121232.1345909-1-aford173@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" According to Table 13-45 of the i.MX8M Mini Reference Manual, the min and max values for M and the frequency range for the VCO_out calculator were incorrect. This information was contradicted in other parts of the mini, nano and plus manuals. After reaching out to my NXP Rep, when confronting him about discrepencies in the Nano manual, he responded with: "Yes it is definitely wrong, the one that is part of the NOTE in MIPI_DPHY_M_PLLPMS register table against PMS_P, PMS_M and PMS_S is not correct. I will report this to Doc team, the one customer should be take into account is the Table 13-40 DPHY PLL Parameters and the Note above." These updated values also match what is used in the NXP downstream kernel. To fix this, make new variables to hold the min and max values of m and the minimum value of VCO_out, and update the PMS calculator to use these new variables instead of using hard-coded values to keep the backwards compatibility with other parts using this driver. Fixes: 4d562c70c4dc ("drm: bridge: samsung-dsim: Add i.MX8M Mini/Nano suppo= rt") Signed-off-by: Adam Ford Reviewed-by: Lucas Stach --- drivers/gpu/drm/bridge/samsung-dsim.c | 22 ++++++++++++++++++++-- include/drm/bridge/samsung-dsim.h | 3 +++ 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge= /samsung-dsim.c index 2be3b58624c3..adb9c13c5f7f 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -405,6 +405,9 @@ static const struct samsung_dsim_driver_data exynos3_ds= i_driver_data =3D { .num_bits_resol =3D 11, .pll_p_offset =3D 13, .reg_values =3D reg_values, + .m_min =3D 41, + .m_max =3D 125, + .vco_min =3D 500, }; =20 static const struct samsung_dsim_driver_data exynos4_dsi_driver_data =3D { @@ -418,6 +421,9 @@ static const struct samsung_dsim_driver_data exynos4_ds= i_driver_data =3D { .num_bits_resol =3D 11, .pll_p_offset =3D 13, .reg_values =3D reg_values, + .m_min =3D 41, + .m_max =3D 125, + .vco_min =3D 500, }; =20 static const struct samsung_dsim_driver_data exynos5_dsi_driver_data =3D { @@ -429,6 +435,9 @@ static const struct samsung_dsim_driver_data exynos5_ds= i_driver_data =3D { .num_bits_resol =3D 11, .pll_p_offset =3D 13, .reg_values =3D reg_values, + .m_min =3D 41, + .m_max =3D 125, + .vco_min =3D 500, }; =20 static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = =3D { @@ -441,6 +450,9 @@ static const struct samsung_dsim_driver_data exynos5433= _dsi_driver_data =3D { .num_bits_resol =3D 12, .pll_p_offset =3D 13, .reg_values =3D exynos5433_reg_values, + .m_min =3D 41, + .m_max =3D 125, + .vco_min =3D 500, }; =20 static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = =3D { @@ -453,6 +465,9 @@ static const struct samsung_dsim_driver_data exynos5422= _dsi_driver_data =3D { .num_bits_resol =3D 12, .pll_p_offset =3D 13, .reg_values =3D exynos5422_reg_values, + .m_min =3D 41, + .m_max =3D 125, + .vco_min =3D 500, }; =20 static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data =3D { @@ -469,6 +484,9 @@ static const struct samsung_dsim_driver_data imx8mm_dsi= _driver_data =3D { */ .pll_p_offset =3D 14, .reg_values =3D imx8mm_dsim_reg_values, + .m_min =3D 64, + .m_max =3D 1023, + .vco_min =3D 1050, }; =20 static const struct samsung_dsim_driver_data * @@ -547,12 +565,12 @@ static unsigned long samsung_dsim_pll_find_pms(struct= samsung_dsim *dsi, tmp =3D (u64)fout * (_p << _s); do_div(tmp, fin); _m =3D tmp; - if (_m < 41 || _m > 125) + if (_m < driver_data->m_min || _m > driver_data->m_max) continue; =20 tmp =3D (u64)_m * fin; do_div(tmp, _p); - if (tmp < 500 * MHZ || + if (tmp < driver_data->vco_min * MHZ || tmp > driver_data->max_freq * MHZ) continue; =20 diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung= -dsim.h index ba5484de2b30..a088d84579bc 100644 --- a/include/drm/bridge/samsung-dsim.h +++ b/include/drm/bridge/samsung-dsim.h @@ -59,6 +59,9 @@ struct samsung_dsim_driver_data { unsigned int num_bits_resol; unsigned int pll_p_offset; const unsigned int *reg_values; + u16 m_min; + u16 m_max; + u64 vco_min; }; =20 struct samsung_dsim_host_ops { --=20 2.39.2