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From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Manivannan Sadhasivam <mani@kernel.org>
Cc: chunfeng.yun@mediatek.com, p.zabel@pengutronix.de,
	chunkuang.hu@kernel.org, vkoul@kernel.org,
	neil.armstrong@linaro.org, matthias.bgg@gmail.com,
	granquet@baylibre.com, justin.yeh@mediatek.com,
	dri-devel@lists.freedesktop.org,
	linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org,
	kernel@collabora.com
Subject: Re: [PATCH 2/2] phy: mediatek: phy-mtk-hdmi-mt8195: Fix TMDS clk bit ratio setting
Date: Thu, 10 Sep 2026 10:39:06 +0200	[thread overview]
Message-ID: <cb72ff50-b62f-47fe-af40-d38558bdff6e@collabora.com> (raw)
In-Reply-To: <5bmxa4pcwkiemubwfjun3dti4szu66gnxe6yw2pudq3wplpc23@inyswc2bdlhw>

On 9/9/26 17:06, Manivannan Sadhasivam wrote:
> On Wed, Jul 01, 2026 at 02:19:36PM +0200, AngeloGioacchino Del Regno wrote:
>> 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!
>> In order to achieve the correct 1/40 (tmds) data rate, this has
> 
> This statement is cut-off!
> 

Oh oops. It's just a forgotten line that has to be removed....

Should I resend or can you simply remove the line
"In order to achieve the correct 1/40 (tmds) data rate, this has"
while applying?

Thanks,
Angelo

>>
>> 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")
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> 
> With above comment addressed,
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
> 
> - Mani
> 




  reply	other threads:[~2026-09-10  8:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-01 12:19 [PATCH 0/2] MediaTek MT8195 HDMI PHY Fixes AngeloGioacchino Del Regno
2026-07-01 12:19 ` [PATCH 1/2] phy: mediatek: phy-mtk-hdmi-mt8195: Fix PLL calc divisor overflow AngeloGioacchino Del Regno
2026-09-09 15:04   ` Manivannan Sadhasivam
2026-07-01 12:19 ` [PATCH 2/2] phy: mediatek: phy-mtk-hdmi-mt8195: Fix TMDS clk bit ratio setting AngeloGioacchino Del Regno
2026-09-09 15:06   ` Manivannan Sadhasivam
2026-09-10  8:39     ` AngeloGioacchino Del Regno [this message]
2026-09-11  5:11       ` Manivannan Sadhasivam
2026-09-11  7:36         ` AngeloGioacchino Del Regno
2026-09-09 12:07 ` [PATCH 0/2] MediaTek MT8195 HDMI PHY Fixes AngeloGioacchino Del Regno

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