From nobody Thu Feb 12 06:16:48 2026 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 A8C36C77B7C for ; Thu, 27 Apr 2023 14:30:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243490AbjD0OaX (ORCPT ); Thu, 27 Apr 2023 10:30:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243468AbjD0OaT (ORCPT ); Thu, 27 Apr 2023 10:30:19 -0400 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B2CA5BAC for ; Thu, 27 Apr 2023 07:29:44 -0700 (PDT) Received: from francesco-nb.pivistrello.it (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 5073420B52; Thu, 27 Apr 2023 16:29:40 +0200 (CEST) From: Francesco Dolcini To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , tomi.valkeinen@ideasonboard.com, dri-devel@lists.freedesktop.org Cc: Francesco Dolcini , David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org Subject: [PATCH v1 2/9] drm/bridge: tc358768: fix PLL parameters computation Date: Thu, 27 Apr 2023 16:29:27 +0200 Message-Id: <20230427142934.55435-3-francesco@dolcini.it> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230427142934.55435-1-francesco@dolcini.it> References: <20230427142934.55435-1-francesco@dolcini.it> 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" From: Francesco Dolcini According to Toshiba documentation the PLL input clock after the divider should be not less than 4MHz, fix the PLL parameters computation accordingly. Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver") Signed-off-by: Francesco Dolcini Reviewed-by: Robert Foss --- drivers/gpu/drm/bridge/tc358768.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc3= 58768.c index 8f349bf4fc32..e9e3f9e02bba 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -334,13 +334,17 @@ static int tc358768_calc_pll(struct tc358768_priv *pr= iv, u32 fbd; =20 for (fbd =3D 0; fbd < 512; ++fbd) { - u32 pll, diff; + u32 pll, diff, pll_in; =20 pll =3D (u32)div_u64((u64)refclk * (fbd + 1), divisor); =20 if (pll >=3D max_pll || pll < min_pll) continue; =20 + pll_in =3D (u32)div_u64((u64)refclk, prd + 1); + if (pll_in < 4000000) + continue; + diff =3D max(pll, target_pll) - min(pll, target_pll); =20 if (diff < best_diff) { --=20 2.25.1