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[61.219.175.100]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29498d23226sm143988155ad.49.2025.10.29.01.11.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Oct 2025 01:11:33 -0700 (PDT) From: Ajye Huang To: linux-kernel@vger.kernel.org Cc: Douglas Anderson , Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , dri-devel@lists.freedesktop.org, Ajye Huang , jazhan@google.com Subject: [PATCH v1 2/2] drm/panel-edp: Modify LQ116M1JW10 panel's bpc to 6 Date: Wed, 29 Oct 2025 16:10:48 +0800 Message-Id: <20251029081048.162374-3-ajye_huang@compal.corp-partner.google.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20251029081048.162374-1-ajye_huang@compal.corp-partner.google.com> References: <20251029081048.162374-1-ajye_huang@compal.corp-partner.google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The link training is failed when bpc value is 8. It sure seems like the panel simply doesn't like 8bpp, Changing the bpc to 6 allows link training to succeed. The 8bpc log shows that link training failed. 6bpc Reviewed-by: Douglas Anderson ---- rate_mhz: 1620 valid rates: 30 bit_rate_khz: 2399760, dp_rate_mhz: 1500, ti_sn_bridge_calc_min_dp_rate_idx= return: 1 8bpc ---- rate_mhz: 2160 valid rates: 30 bit_rate_khz: 3199680, dp_rate_mhz: 2000, ti_sn_bridge_calc_min_dp_rate_idx= return: 2 Link training failed, link is off. Disable the PLL if we failed. Signed-off-by: Ajye Huang --- drivers/gpu/drm/panel/panel-edp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/pane= l-edp.c index da3e8f223ec3..13755168cd75 100644 --- a/drivers/gpu/drm/panel/panel-edp.c +++ b/drivers/gpu/drm/panel/panel-edp.c @@ -2094,7 +2094,7 @@ static const struct edp_panel_entry edp_panels[] =3D { EDP_PANEL_ENTRY('S', 'H', 'P', 0x1511, &delay_200_500_e50, "LQ140M1JW48"), EDP_PANEL_ENTRY('S', 'H', 'P', 0x1523, &delay_80_500_e50, "LQ140M1JW46"), EDP_PANEL_ENTRY('S', 'H', 'P', 0x153a, &delay_200_500_e50, "LQ140T1JH01"), - EDP_PANEL_ENTRY('S', 'H', 'P', 0x154c, &delay_200_500_p2e100, "LQ116M1JW1= 0"), + EDP_PANEL_ENTRY3('S', 'H', 'P', 0x154c, &delay_200_500_p2e100, "LQ116M1JW= 10", 6), EDP_PANEL_ENTRY('S', 'H', 'P', 0x158f, &delay_200_500_p2e100, "LQ134Z1"), EDP_PANEL_ENTRY('S', 'H', 'P', 0x1593, &delay_200_500_p2e100, "LQ134N1"), =20 --=20 2.25.1