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 6F662C77B61 for ; Thu, 27 Apr 2023 14:30:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244113AbjD0Oag (ORCPT ); Thu, 27 Apr 2023 10:30:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243431AbjD0OaT (ORCPT ); Thu, 27 Apr 2023 10:30:19 -0400 Received: from mail11.truemail.it (mail11.truemail.it [IPv6:2001:4b7e:0:8::81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3BA685BB2 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 C28EC20B57; 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 3/9] drm/bridge: tc358768: fix PLL target frequency Date: Thu, 27 Apr 2023 16:29:28 +0200 Message-Id: <20230427142934.55435-4-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 Correctly compute the PLL target frequency, the current formula works correctly only when the input bus width is 24bit, actually to properly compute the PLL target frequency what is relevant is the bits-per-pixel on the DSI link. No regression expected since the DSI format is currently hard-coded as MIPI_DSI_FMT_RGB888. Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver") Signed-off-by: Francesco Dolcini Reviewed-by: Robert Foss --- drivers/gpu/drm/bridge/tc358768.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc3= 58768.c index e9e3f9e02bba..dba1bf3912f1 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -146,6 +146,7 @@ struct tc358768_priv { =20 u32 pd_lines; /* number of Parallel Port Input Data Lines */ u32 dsi_lanes; /* number of DSI Lanes */ + u32 dsi_bpp; /* number of Bits Per Pixel over DSI */ =20 /* Parameters for PLL programming */ u32 fbd; /* PLL feedback divider */ @@ -284,12 +285,12 @@ static void tc358768_hw_disable(struct tc358768_priv = *priv) =20 static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk) { - return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->pd_lines); + return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->dsi_bpp); } =20 static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk) { - return (u32)div_u64((u64)pclk * priv->pd_lines, priv->dsi_lanes); + return (u32)div_u64((u64)pclk * priv->dsi_bpp, priv->dsi_lanes); } =20 static int tc358768_calc_pll(struct tc358768_priv *priv, @@ -426,6 +427,7 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_hos= t *host, priv->output.panel =3D panel; =20 priv->dsi_lanes =3D dev->lanes; + priv->dsi_bpp =3D mipi_dsi_pixel_format_to_bpp(dev->format); =20 /* get input ep (port0/endpoint0) */ ret =3D -EINVAL; @@ -437,7 +439,7 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_hos= t *host, } =20 if (ret) - priv->pd_lines =3D mipi_dsi_pixel_format_to_bpp(dev->format); + priv->pd_lines =3D priv->dsi_bpp; =20 drm_bridge_add(&priv->bridge); =20 --=20 2.25.1