From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792774799; b=faHt9sFuFqQ/GXOdGmyqgK+vn+9N5YzcskKb87hByoVhNwfv40Xxyf4esVATk7rqAzB8 klHKIHcLVJopbf1HWp8gNrGljB3K7HKmH8bKZbBkDCjlarJanuS/6lAufW2yyBV+cD9BM XRKpo7bteDE/v8zTEnT68APLPOf/mdB9bwc002o0V3PDx+PgqJui82WFIcbXc99eUJYet ajwlrp+z7L2CiijPgIoQh6ywx9Y91kLy6walWl+5tX3LAKil7wMMWtVTkDBeSXMXEG3rY upJ1stHbYG3u23D3xy4NnmnKpTQvDs4jXsm6TdT4w+mrHNgXrQcZPTCx20B6VWdpQHA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792774799; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=b3y6mWUKrWlaKO8vtnIl/IdiUbQuLWHZQ4msZg6jj2I=; b=hVaS/i10xyScR1/lIsvSeCSDYP5m2OZi//OKWm4SVZrG86Qq8OF8KUcmXuLoCXq9bBK6 I3v5LZmQjSA1LKHcrOPvcqhloaJ+HXDtV3n/goGr/2+6aqAfUD8+aB6zFH+BkzudwkF6x alxb3DKdtfUF/6Rfj34HY7DP2jXJsTiTFDldVbnIIpNInWdECsMN1GSSE1IFgQgfi34Zv IyhxOXT4DHyg9YMWwEzOUlMnE9w4jB8Hz8eK5LIQjdDpgu4HoiHCJYTzqJx0nB/Yezb6g wW8Q67hsTIXrqW0VpUGjvy9tpGt0sAyqVCPB4CYr4B6zmgyjN2Lq1VrVAa430A6QUmA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=lbziGgQH; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD5FD606A31F; Fri, 23 Oct 2026 16:59:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=lbziGgQH Received: by smtp.kernel.org (Postfix) with ESMTPSA id 184CA1F01825; Fri, 23 Oct 2026 16:59:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792774798; bh=b3y6mWUKrWlaKO8vtnIl/IdiUbQuLWHZQ4msZg6jj2I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=lbziGgQHw+IeNVvjRFWlJvAiM4Yv+eWduBpp6PCAE1ztdwPagobZb8qsTjrFmpOa6 DLzP0jQELYq+a4gfOHnbrVr7DJ9mVkmUL70bzRdluwYLXX3jjAOZJCLuSoUwsPO+m6 gVKujOPRnC9Y8r8ksRrkTMvLXD0YE3N9/7mGxdjQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jani Nikula , Dnyaneshwar Bhadane , Chaitanya Kumar Borah , Joonas Lahtinen Subject: [PATCH 7.2 161/242] drm/i915/cx0_phy: Fix ARL-S host bridge detection Date: Fri, 23 Oct 2026 18:40:03 +0200 Message-ID: <20261023163717.592157986@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261023163713.816071858@linuxfoundation.org> References: <20261023163713.816071858@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dnyaneshwar Bhadane commit 6a8bf59de3ef47ff51face6ea826395a1098baa0 upstream. Fix is_arrowlake_s_by_host_bridge() which always returned false. The while loop always exits with pdev as NULL, so the return condition was always false, causing the wrong tx_misc value to be used. Check the host bridge ID inside the loop body. Once found early exit from the loop release the pci reference "pdev" and return true. v2: - Update commit message (Chaitanya) Bspec:74165,74491 Suggested-by: Jani Nikula Cc: Fixes: 3630a47b700e ("drm/i915/cx0_phy: Update HDMI TMDS C20 algorithm value") Signed-off-by: Dnyaneshwar Bhadane Reviewed-by: Chaitanya Kumar Borah Signed-off-by: Chaitanya Kumar Borah Link: https://patch.msgid.link/20260921090226.946472-1-dnyaneshwar.bhadane@intel.com (cherry picked from commit 0507cc5a476af0b6d037b19248bdd20dbe27487d) Signed-off-by: Joonas Lahtinen Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/display/intel_cx0_phy.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) --- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c +++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c @@ -2341,12 +2341,14 @@ static void intel_c10pll_dump_hw_state(s static bool is_arrowlake_s_by_host_bridge(void) { struct pci_dev *pdev = NULL; - u16 host_bridge_pci_dev_id; + while ((pdev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, pdev))) { + if (IS_ARROWLAKE_S_BY_HOST_BRIDGE_ID(pdev->device)) { + pci_dev_put(pdev); + return true; + } + } - while ((pdev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, pdev))) - host_bridge_pci_dev_id = pdev->device; - - return pdev && IS_ARROWLAKE_S_BY_HOST_BRIDGE_ID(host_bridge_pci_dev_id); + return false; } static u16 intel_c20_hdmi_tmds_tx_cgf_1(struct intel_display *display)