linux-kernel - Re: [PATCH 3/4] arm64: dts: qcom: sc8280xp: Add initial support for Ntmer TW220

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Message-ID: <0cf8f99c-a64b-43c4-a747-d5dd6fe28996@oss.qualcomm.com>
Date: Fri, 1 Aug 2025 14:29:22 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Pengyu Luo <mitltlatltl@...il.com>
Cc: aliceryhl@...gle.com, andersson@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, ebiggers@...gle.com,
        ilpo.jarvinen@...ux.intel.com, joel.granados@...nel.org,
        konradybcio@...nel.org, krzk+dt@...nel.org, len.brown@...el.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        lossin@...nel.org, mingo@...nel.org, ojeda@...nel.org, robh@...nel.org,
        sfr@...b.auug.org.au, vanyang@...il.nju.edu.cn,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH 3/4] arm64: dts: qcom: sc8280xp: Add initial support for
 Ntmer TW220

On 7/31/25 5:05 AM, Pengyu Luo wrote:
> Linux:
>> ae94000 20050001 000001f3 0000000b dddd1011
>> ae94010 00009130 31211101 3e2e1e0e 00001900
>> ae94020 00000000 05190019 064c000c 065f0528
>> ae94030 00060000 00000000 00040000 14000000
>> ae94040 06100006 00003c2c 00001000 00000008
> Windows:
>> ae94000 20050001 000001f7 00000008 00001010
>> ae94010 00009130 31211101 3e2e1e0e 00001900
>> ae94020 00000000 05320032 064c000c 065f0551
>> ae94030 000c0000 00000000 00040000 14000000
>> ae94040 00100008 00013c2c 9bb9b000 00000004

0xae94008 differs, bits 0 and 1 say that the cmd mode engine
is busy doing something (did you set MIPI_DSI_MODE_VIDEO?)

0xae94024 says:
Linux:
ACTIVE_H_END=1305
ACTIVE_H_START=25
Windows:
ACTIVE_H_END=1330
ACTIVE_H_START=50

0xae9402c:
Linux:
VTOTAL=1631
HTOTAL=1320
Windows:
VTOTAL=1631
HTOTAL=1361

0xae94030:
Linux:
HS_END=6
Windows:
HS_END=12

0xae94040:
Linux:
RGB565 (16 bpp)
bits 25/26 are "set RGB888 for DSI1 stream"
Windows:
RGB888 (24 bpp)

(suggesting your panel driver is wrong)

0xae94044:
you may want to move the

/* Always insert DCS command */
data |= DSI_CMD_CFG1_INSERT_DCS_COMMAND;
dsi_write(msm_host, REG_DSI_CMD_CFG1, data);

in dsi_host.c out of the if (!video), not sure if it's correct
but that's what Windows seems to be setting

The other differences are due to the current DCS command(s) being
processed


Hope this helps

Konrad