From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB7BF1ED38 for ; Tue, 25 Jul 2023 11:15:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F18DC433C8; Tue, 25 Jul 2023 11:15:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690283718; bh=SK+8BVCl7tsFd5+2w34D2lOLy349/D9UGQNYKcOGtEw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GfJnxFXbGFYZ2nOcu4fzIBS+l3uWccjfDV6n2egMQPh46iDTx353A6PmXQ9JevkIF PIHNjuaBQPWlOIZcz6vsYa/6rsor5X/msq6slvVpJhR0mvCrZ/FjB0CJ+DJjmUFjan LmgJVjKIwyNi9RZpDlwkb/AqdwJzG5bqBQrC8rzw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Francesco Dolcini , Robert Foss , Sasha Levin Subject: [PATCH 5.10 098/509] drm/bridge: tc358768: fix PLL target frequency Date: Tue, 25 Jul 2023 12:40:37 +0200 Message-ID: <20230725104558.173841577@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104553.588743331@linuxfoundation.org> References: <20230725104553.588743331@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Francesco Dolcini [ Upstream commit ffd2e4bbea626d565b9817312b0fcfb382fecb88 ] 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 Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20230427142934.55435-4-francesco@dolcini.it Signed-off-by: Sasha Levin --- 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/tc358768.c index d9021e750940f..4aec4b428189c 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -147,6 +147,7 @@ struct tc358768_priv { 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 */ /* Parameters for PLL programming */ u32 fbd; /* PLL feedback divider */ @@ -279,12 +280,12 @@ static void tc358768_hw_disable(struct tc358768_priv *priv) 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); } 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); } static int tc358768_calc_pll(struct tc358768_priv *priv, @@ -421,6 +422,7 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_host *host, priv->output.panel = panel; priv->dsi_lanes = dev->lanes; + priv->dsi_bpp = mipi_dsi_pixel_format_to_bpp(dev->format); /* get input ep (port0/endpoint0) */ ret = -EINVAL; @@ -432,7 +434,7 @@ static int tc358768_dsi_host_attach(struct mipi_dsi_host *host, } if (ret) - priv->pd_lines = mipi_dsi_pixel_format_to_bpp(dev->format); + priv->pd_lines = priv->dsi_bpp; drm_bridge_add(&priv->bridge); -- 2.39.2