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mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1748346843; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type:Message-Id:Reply-To; bh=9yF1OUbT1bqu1NB/QJlao6B5ghagW3BtXAYQCUIhaR8=; b=VoZxWQ2IeFTd9cH4jQs4r4SzlZGf39Y8YHF1/y1CWVxa5UISmlLhsyWOZ28/0xhH 2WMDvv4/ZWr0FFF6+E0hJrKdnOiiKDwITtJrPR87WtwuFTgJ5c3h48Yz34khg77dbv8 dJTwToJj2bygZxc3nM1BD6O9SErZnnyiv/vmezUU= Received: by mx.zohomail.com with SMTPS id 1748346840882568.0136270447825; Tue, 27 May 2025 04:54:00 -0700 (PDT) From: Nicolas Frattaroli To: heiko@sntech.de, linux-rockchip@lists.infradead.org, Andy Yan Cc: simic@manjaro.org, krzk+dt@kernel.org, robh@kernel.org, devicetree@vger.kernel.org, conor+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, algea.cao@rock-chips.com, Andy Yan Subject: Re: [PATCH v2] arm64: dts: rockchip: Adjust the HDMI DDC IO driver strength for rk3588 Date: Tue, 27 May 2025 13:53:56 +0200 Message-ID: <3704844.aeNJFYEL58@workhorse> In-Reply-To: <20250522020537.1884771-1-andyshrk@163.com> References: <20250522020537.1884771-1-andyshrk@163.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250527_045423_659666_3A0359D6 X-CRM114-Status: GOOD ( 14.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thursday, 22 May 2025 04:05:24 Central European Summer Time Andy Yan wrote: > From: Andy Yan > > For the RK3588 HDMI controller, the falling edge of DDC SDA and SCL > almost coincide and cannot be adjusted by HDMI registrer, resulting > in poor compatibility of DDC communication. > > An improvement of the compatibility of DDC can be done by increasing > the driver strength of SCL and decreasing the driver strength of SDA > to increase the slope of the falling edge. > > It should be noted that the maximum driving strength of hdmim0_tx1_scl > is only 3, which is different from that of the other IOs. > > Signed-off-by: Andy Yan > > --- > > Changes in v2: > - Correct the max drive level of hdmim0_tx1_scl. > > .../dts/rockchip/rk3588-base-pinctrl.dtsi | 20 +++++------ > .../dts/rockchip/rk3588-extra-pinctrl.dtsi | 5 +-- > .../boot/dts/rockchip/rockchip-pinconf.dtsi | 35 +++++++++++++++++++ > 3 files changed, 48 insertions(+), 12 deletions(-) > Tested-by: Nicolas Frattaroli Quickly tested this on both HDMI ports of a ROCK 5T with an HDMI capture card on the other end. While I didn't originally have any issues to begin with, this patch does not introduce any new ones, so seems good to me.