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[2001:99a:252:3300:d706:9b57:5996:15b4]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-393f625bd3bsm42816281fa.34.2026.05.13.09.14.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 May 2026 09:14:46 -0700 (PDT) Message-ID: <553c16d9-26f9-4702-9214-02e44502af58@oss.qualcomm.com> Date: Wed, 13 May 2026 19:14:44 +0300 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] drm/panel: simple: Add timings for Raspberry Pi 7" panel To: Tomi Valkeinen , Marek Vasut Cc: Maxime Ripard , Dave Stevenson , Neil Armstrong , Jessica Zhang , David Airlie , Simona Vetter , Maarten Lankhorst , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , Sam Ravnborg , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260420-rpi-7inch-v1-0-e68d5c9c44bc@ideasonboard.com> <20260420-rpi-7inch-v1-2-e68d5c9c44bc@ideasonboard.com> <3z3u5mbngmbzsch3mzs3twlh3aec6r7jokstzv3ghxyusrzt6b@jqvdnuiapx6e> <20260423-kickass-fat-boa-209f68@houat> <72c2cd94-0a8b-46c8-981b-4ad4a3222e59@ideasonboard.com> <103f94d0-2599-497d-ae37-d88922b9f669@ideasonboard.com> Content-Language: en-US From: Dmitry Baryshkov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: T0AUDT2KMXl-POHNfVQBgMoWO-cpX_sf X-Authority-Analysis: v=2.4 cv=Hu5G3UTS c=1 sm=1 tr=0 ts=6a04a378 cx=c_pps a=KB4UBwrhAZV1kjiGHFQexw==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=RF00TdSWAAAA:8 a=lLZmtIKjAAAA:8 a=P1BnusSwAAAA:8 a=YvoeO6lhbD8J2Jc-U_EA:9 a=QEXdDO2ut3YA:10 a=o1xkdb1NAhiiM49bd1HK:22 a=_nx8FpPT0le-2JWwMI5O:22 a=q5Nj8NTjyn2D8kUwajRn:22 a=D0XLA9XvdZm18NrgonBM:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTEzMDE2NSBTYWx0ZWRfXwi/JlTPWgbOP fBQo1tZ0MsOQNZVn/E/1A+RmaZlLlP1YJow+DYD/nVE116QHt6tRwSHxJtatxjNxg/iejeO3QTg 4tXGbOoBZbtIS4kdRk7Trj5YPznmzYRDoqQWHk0vFJRBNlumOjSD92ZmajTWmG/MH3/O4VOMnZj JOKFbhrq4K3rdJTd55oBUMIrIXwkDoam+yjoYliiWQ1XaUMSr9j+jIZaUu9Ob8hwoQkpEdr4jLS 7KsoZyIUzXu/Wh4tBy3sgJo0SuJIUSe3usjQ8nKatfFxJWpphlfr8XdAmKZ9m3gzJ9yuVO7Vo3c XCE/SyFFipx7z0OtwtsD4vNWN3okjNON+HgZuMD7KB4dg6M0dhlDHyorVDJ+A//rz7x2bNb5puV 6e0US8Dt9c4bqrv1gWNwJYniS0L30nXAr7EkkQ1Vp2ts1SfQKB+ryX2gwkyRBDidz3MBYlg8K/i ob2umauj2V/cg+H70+w== X-Proofpoint-ORIG-GUID: T0AUDT2KMXl-POHNfVQBgMoWO-cpX_sf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-13_01,2026-05-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605050000 definitions=main-2605130165 On 13/05/2026 14:52, Tomi Valkeinen wrote: > Hi, > > On 23/04/2026 18:01, Tomi Valkeinen wrote: >> Hi, >> >> On 23/04/2026 16:54, Marek Vasut wrote: >>> On 4/23/26 3:16 PM, Tomi Valkeinen wrote: >>> >>> Hello Tomi, >>> >>>>>> In the past I used this panel compat instead of the >>>>>> panel-raspberrypi-touchscreen.c and it worked. >>>>>> IIRC Marek splitted the multi-function module into a regulator and >>>>>> the >>>>>> panel description. >>>>> Ok... Indeed https://pip.raspberrypi.com/categories/651-pcn lists >>>>> PH800480T013 as one of the panels used. Although two variants are >>>>> listed, and also a third panel model, possibly from another vendor. >>>>> >>>>> My module is v1.1, and I think it has the PH800480T013-IAC21 >>>>> D/5624/ KIT- LC variant. >>>> A question to Marek: Where did you get the timings for PH800480T013? >>>> Did you find a datasheet? >>> Search engine first link: >>> >>> https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5337/ >>> PH800480T013-IHC09.pdf >> >> I tested the "powertip,ph800480t013-idf02". I'm using BeagleY-AI here, >> and it didn't work at all. After some testing, I figured out these: >> >> HSW of 2 is much too small. But this could be an issue on the display >> controller or the DSI encoder side. HWS of around 8 starts to work ok. >> Below that, I don't get anything on the screen. >> >> The syncs are interesting. I set them to DISPLAY_FLAGS_VSYNC_HIGH | >> DISPLAY_FLAGS_HSYNC_HIGH, Marek to DRM_MODE_FLAG_NVSYNC | >> DRM_MODE_FLAG_NHSYNC. But I have sent the TC358762 series, which fixes >> the syncs that the bridge sends (20260327-tc358762-fixes- >> v2-0-3589d3c45f4a@ideasonboard.com). >> >> Flipping the syncs might explain why I used 46 and 23 as the >> backporches, Marked used 46-hsw and 23-vsw for backporches (well, >> Marek's vbp was off by one as I mentioned). >> >> But now I'm getting unsure if my TC358762 fixed the syncs correctly... >> I'm pretty sure I measured those with my scope, though. > I did some digging. > > The upstream TC358762 syncs are wrong, and inverse what they're supposed > to be. The upstream powertip,ph800480t013-idf02 timings are such that > the image still gets centered correctly, even with the wrong syncs, but > this makes the timings not match the datasheet. > > With my TC358762 series, the syncs on the parallel bus are correct, and > thus powertip,ph800480t013-idf02 no longer works right. My > raspberrypi,7inch-dsi panel timings work right with the TC358762 series, > but those panel timings have the sync polarities wrong, and thus the > timings are also not according to the datasheet. > > So: we can drop this series. I'll fix the timings for > powertip,ph800480t013-idf02, and then it'll work with the RaspberryPi 7" > DSI display module... Ack, thanks for your updates. -- With best wishes Dmitry