From nobody Thu Feb 12 06:17:29 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 0A227C77B61 for ; Thu, 27 Apr 2023 14:30:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243705AbjD0Oaw (ORCPT ); Thu, 27 Apr 2023 10:30:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244111AbjD0OaZ (ORCPT ); Thu, 27 Apr 2023 10:30:25 -0400 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA88E4696 for ; Thu, 27 Apr 2023 07:30:19 -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 B1F6B20B60; Thu, 27 Apr 2023 16:29:42 +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 7/9] drm/bridge: tc358768: fix TXTAGOCNT computation Date: Thu, 27 Apr 2023 16:29:32 +0200 Message-Id: <20230427142934.55435-8-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 Correct computation of TXTAGOCNT register. This register must be set to a value that ensure that the TTA-GO period =3D (4 x TLPX) with the actual value of TTA-GO being 4 x (TXTAGOCNT + 1) x (HSByteClk cycle) Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver") Signed-off-by: Francesco Dolcini Reviewed-by: Robert Foss --- drivers/gpu/drm/bridge/tc358768.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc3= 58768.c index 36e33cba59a2..854fc04f08d0 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -795,7 +795,7 @@ static void tc358768_bridge_pre_enable(struct drm_bridg= e *bridge) =20 /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */ val =3D tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4); - val =3D tc358768_ns_to_cnt(val, dsibclk_nsk) - 1; + val =3D tc358768_ns_to_cnt(val, dsibclk_nsk) / 4 - 1; val2 =3D tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk), dsibclk_nsk) - 2; val =3D val << 16 | val2; --=20 2.25.1