Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C745272E7C; Tue, 2 Sep 2025 13:43:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820612; cv=none; b=ms1KzL3yCczYuJn+QpH+qFAcSSLbAOjzJ4OkZCRJ5ScIolZwJWqZD3JrjyD8OINYM34wabdI/vSvzXQU9/gpFaPL5uMpUxlHocOB890acczdg4btKVhQsd6H/ygFfN9kOAH9H+6zNTDd2E9s5Zeb/vPJIpdqZ5BTjX17rkV50Q4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820612; c=relaxed/simple; bh=qsUoQhd88B3F7R2cgLAf+NBGQ163XINWd7rq50PFSV0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ddbuk/qHQir5TR+yuQ4x5iEY7BXrFZxid0LwkAUpGf24e9YhQNWBZLzhglgZcSmgcNNPIt6bPLf6z52ls3bmQSZVbppWtbRjlrkPUaPytb/fygt25GmlU4Kt8CBlhGmkpmXMF/t9y/VUTLVrh3y3BvTwsQNJukDt6mdsuqoPsKw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=XlTszYdd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="XlTszYdd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65DDDC4CEED; Tue, 2 Sep 2025 13:43:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756820611; bh=qsUoQhd88B3F7R2cgLAf+NBGQ163XINWd7rq50PFSV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XlTszYddk/zq4yBu4cc6e5AxGXtT/nTmQ83toS8r30C1H0zwno0JLfSYm04T9oIer 9HtoZrmtZDd7HrlNXcM5CJp8nUO7Q35/7iF+QbgHJJk6goZQXW3CV1DIjvXEFDQWk5 ZfZM6dCidAxJliZSHMeQgeuwOyoeWcTPRxaW054c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Sasha Levin , Imre Deak Subject: [PATCH 5.15 32/33] Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS" Date: Tue, 2 Sep 2025 15:21:50 +0200 Message-ID: <20250902131928.323789346@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131927.045875971@linuxfoundation.org> References: <20250902131927.045875971@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Imre Deak This reverts commit a19b31f854a8992dfa35255f43efd19be292b15c which is commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f upstream. The upstream commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f ("drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS") the reverted commit backported causes a regression, on one eDP panel at least resulting in display flickering, described in detail at the Link: below. The issue fixed by the upstream commit will need a different solution, revert the backport for now. Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: Sasha Levin Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558 Signed-off-by: Imre Deak Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_dp_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -336,7 +336,7 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_a * monitor doesn't power down exactly after the throw away read. */ if (!aux->is_remote) { - ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_LANE0_1_STATUS, + ret = drm_dp_dpcd_access(aux, DP_AUX_NATIVE_READ, DP_DPCD_REV, buffer, 1); if (ret != 1) goto out;