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 3BDE88F74 for ; Sun, 16 Jul 2023 20:03:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2F78C433C8; Sun, 16 Jul 2023 20:03:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689537835; bh=yHyq7tBFcrv7UPp3Aawh0GQa6mXCEyfNLVrsGavfYKU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TuRgER7OZXHzN7UBsCYcri1KnC/FGMq1oR6hEWb18boCHLrxBtQbyC44WdA8KHoxb WSaI9p9Gfg1hgdQCH+YODOR0843RA94S3w9S47kRT8tBGZpgrZ9QzAJyiJYjshWsZK RqyB8adz5Gl7NbJLZ+oF/xMN8wl3nIZV+aQI1J+c= 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 6.4 236/800] drm/bridge: tc358768: fix PLL parameters computation Date: Sun, 16 Jul 2023 21:41:29 +0200 Message-ID: <20230716194954.571424554@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194949.099592437@linuxfoundation.org> References: <20230716194949.099592437@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 6a4020b4c63911977aaf8047f904a300d15de739 ] 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 Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20230427142934.55435-3-francesco@dolcini.it Signed-off-by: Sasha Levin --- 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/tc358768.c index 8f349bf4fc32f..e9e3f9e02bba0 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 *priv, u32 fbd; for (fbd = 0; fbd < 512; ++fbd) { - u32 pll, diff; + u32 pll, diff, pll_in; pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor); if (pll >= max_pll || pll < min_pll) continue; + pll_in = (u32)div_u64((u64)refclk, prd + 1); + if (pll_in < 4000000) + continue; + diff = max(pll, target_pll) - min(pll, target_pll); if (diff < best_diff) { -- 2.39.2