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[2001:14ba:a073:af00:264b:feff:fe8b:be8a]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-395882814f1sm7159191fa.2.2026.05.17.13.58.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 May 2026 13:58:58 -0700 (PDT) Date: Sun, 17 May 2026 23:58:55 +0300 From: Dmitry Baryshkov To: vishnu.saini@oss.qualcomm.com Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, prahlad.valluru@oss.qualcomm.com, Ravi Agola Subject: Re: [PATCH] drm/bridge: lt9611uxc: support displays with up to 4 EDID blocks Message-ID: References: <20260517-lt9611usc_edid34_misc_next-v1-1-5e2fd8c6399b@oss.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260517-lt9611usc_edid34_misc_next-v1-1-5e2fd8c6399b@oss.qualcomm.com> X-Authority-Analysis: v=2.4 cv=cuSrVV4i c=1 sm=1 tr=0 ts=6a0a2c15 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=AsM0TcmizTee10SJ8BgA:9 a=CjuIK1q_8ugA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE3MDIyNiBTYWx0ZWRfX1KyPU5QmAh3V HUx9TulPUCbHZosJSJZEXngsnQ7Lvrwp+GWnilQf/zDtAcnA7xvvJY3CUC6/z17NkguBPcO676S Cwr6BwvGzKQ/htdsRibPOJCjrGDVZWHHYefUpLj/oOE9fesPcwq1dG27mly/NxJ2jctLGbkSJiC jDUQ+3IQx81A9yP7o5CEPqIWtOgP6oCmKEfLPIktfPOIuJByJqTzkeAe2N9eovhjG5ULKbQfTXK IOb5gCMvpiZeJmq9pbnjZZGVH0S/8GxRsASk4cqzX1TkN/+N5cx4N0sm8+AsjlJ3jM5jCIXjIrs 4LjNz9KQ9kAldLBUSqBRbwBBclAsJhd2kVenlVrKWLociGpde9YsLnn8nmeiHQCVTBrp/vkZSEG ZbAF7OiDRFhoYqyoUaoNvFAkH+YSxoDZpnIQFGsv70gwWSijQkD9LTl4DZdOCBuy0hUZwGzEoTC Se3QfPX426ZJMCFrVtw== X-Proofpoint-GUID: AxwTJLeh7TrsUjxunEVKz5N3PSROL_mB X-Proofpoint-ORIG-GUID: AxwTJLeh7TrsUjxunEVKz5N3PSROL_mB 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=2026-05-17_05,2026-05-15_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 impostorscore=0 bulkscore=0 adultscore=0 spamscore=0 clxscore=1015 suspectscore=0 phishscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605170226 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Sun, May 17, 2026 at 11:44:49PM +0530, vishnu.saini@oss.qualcomm.com wrote: > From: Ravi Agola > > The LT9611UXC bridge can fetch only 2 EDID blocks at a time, which > previously limited EDID reading to 2 blocks and prevented support > for displays exposing more than 2 EDID blocks. > > Extend the driver to support up to 4 EDID blocks by re-triggering > EDID access after the first 2 blocks are read. For block 2, clear > the EDID ready flag in 0xb02a so the bridge can expose the remaining > blocks, then retry the read until the expected EDID is returned. Won't this affect re-reading of the EDID? If so, we might need to reset the flag at the block0 path too. > > Also cache the full EDID blob in the driver and reuse it until the > next HPD disconnect event, so repeated EDID reads do not re-query > the bridge. Separte commit, separate justification. Most of the drivers don't use the cache, so, I'd say, most likely no. > > Signed-off-by: Ravi Agola > Signed-off-by: Vishnu Saini > --- > drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 84 ++++++++++++++++++++++++++---- > 1 file changed, 73 insertions(+), 11 deletions(-) > -- With best wishes Dmitry