From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 9DF92340A6F; Wed, 23 Sep 2026 14:41:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790174514; cv=none; b=QOhmohUb7tLdWvfQMbqZKuvhAm/v75mvbCnXXIZVYlNyedCscw5iSi6jRHxR27zXDYdYmsYfjyemktiFiR/OdjbLOSOLXZmd97IEZyzjlWr7JyOPFAyGjGN1qpDUQy4wjJ0sQ9eywYEA1KglSHK2/4GEhQV8AEZRVIHFiOEOvG8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790174514; c=relaxed/simple; bh=0v57/b3hNIX3oKUL3SYn4zuWZ0bmSz4dbYT6UQhlv/M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BzqPB2N5L4bJhmAgJadGXIKWLpTj7lbPljWeJjxUFegbW5IfqVrShR4Zt/a3UiKRZ89RUUE/Ed1CoaLBFnAkTHVQkmyGuLXekkrIQYYgMvJUpcnRdO7mNTU27PChJxEWRRypV1rNMbMswZp1jtWER1T75pPCoTMYyc60ohQtfpQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rMdOup16; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rMdOup16" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ECCCC1F000FF; Wed, 23 Sep 2026 14:41:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790174513; bh=RR9OGdAF4v714CDNlT3UwVouuHQ3luSCV/XKt+B2k4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rMdOup16pW3CKQ0vzkXrHW+l+wu02+sO7VjFDZKj7jEzGiV+3L0N/zXnq6PuEYKaF 6ahWZB3g50S+l50+HYqplD7fbKzVwK+sQPlhFHvGrjUNKIn4en7f04tYJOzZ+QXbn5 YQZ+OzIL7dnmnQbcDCuaDPdFmrywPe6kup9lFcMs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Manivannan Sadhasivam , AngeloGioacchino Del Regno , Vinod Koul , Sasha Levin Subject: [PATCH 6.18 106/398] phy: mediatek: phy-mtk-hdmi-mt8195: Fix TMDS clk bit ratio setting Date: Wed, 23 Sep 2026 16:03:00 +0200 Message-ID: <20260923140646.187028150@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923140643.441954610@linuxfoundation.org> References: <20260923140643.441954610@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: AngeloGioacchino Del Regno [ Upstream commit 486a70ef848264dcf9a57f0bb0452848db9537de ] The comment in the mtk_phy_tmds_clk_ratio() function clearly and correctly explains that the TMDS ratio has to be 1/10 for data rates under 3.4Gbps, and 1/40 over that. Unfortunately though, the TXC_DIV register setting was wrong, as in value 3 means to divide by 8 and, in order to achieve the in spec 1/40 (tmds) data rate, this has to divide by 4 instead! Add definitions for the TXC_DIV register values clearly explaining the meanings (DIV2, DIV4, DIV8), and program the correct, DIV 4, value to the register in mtk_phy_tmds_clk_ratio(). This fixes out of spec clocking and, with this change, SoCs using the MT8195 class HDMI PHYs can now successfully be configured to output 3840x2160@60Hz over HDMI. Fixes: 45810d486bb4 ("phy: mediatek: add support for phy-mtk-hdmi-mt8195") Reviewed-by: Manivannan Sadhasivam Signed-off-by: AngeloGioacchino Del Regno Link: https://patch.msgid.link/20260911074015.9994-3-angelogioacchino.delregno@collabora.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 2 +- drivers/phy/mediatek/phy-mtk-hdmi-mt8195.h | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c index 829d329af1732..2f03c4e66d6fe 100644 --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c @@ -36,7 +36,7 @@ mtk_phy_tmds_clk_ratio(struct mtk_hdmi_phy *hdmi_phy, bool enable) * clock bit ratio 1:40, under 3.4Gbps, clock bit ratio 1:10 */ if (enable) - mtk_phy_update_field(regs + HDMI20_CLK_CFG, REG_TXC_DIV, 3); + mtk_phy_update_field(regs + HDMI20_CLK_CFG, REG_TXC_DIV, VAL_TXC_DIV4); else mtk_phy_clear_bits(regs + HDMI20_CLK_CFG, REG_TXC_DIV); } diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.h b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.h index e26caaf4d104c..58800d7659ca0 100644 --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.h +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.h @@ -17,6 +17,9 @@ #define HDMI20_CLK_CFG 0x70 #define REG_TXC_DIV GENMASK(31, 30) +#define VAL_TXC_DIV2 1 +#define VAL_TXC_DIV4 2 +#define VAL_TXC_DIV8 3 #define HDMI_1_CFG_0 0x00 #define RG_HDMITX21_DRV_IBIAS_CLK GENMASK(10, 5) -- 2.53.0