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[174.165.208.10]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84ea0055325sm3689108b3a.15.2026.07.30.13.11.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jul 2026 13:11:42 -0700 (PDT) From: Michael Kelley X-Google-Original-From: Michael Kelley To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@kernel.org, ssengar@linux.microsoft.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com, sgarzare@redhat.com, horms@kernel.org Cc: x86@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, virtualization@lists.linux.dev Subject: [RESEND PATCH 4/6] drm_hyperv: Remove support for synth video protocol of old Hyper-V hosts Date: Thu, 30 Jul 2026 13:11:21 -0700 Message-Id: <20260730201123.1767-5-mhklinux@outlook.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260730201123.1767-1-mhklinux@outlook.com> References: <20260730201123.1767-1-mhklinux@outlook.com> Reply-To: mhklinux@outlook.com Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit With the overall removal of Linux support for running on Hyper-V hosts earlier than WS2016 and Windows 10, it's no longer necessary to support older synthetic video protocols. Remove the support. Signed-off-by: Michael Kelley --- drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 33 +++++++---------------- 1 file changed, 10 insertions(+), 23 deletions(-) diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c index f0ef627b4898..cea1ea2595cd 100644 --- a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c +++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c @@ -17,7 +17,7 @@ #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) -/* Support for VERSION_WIN7 is removed. #define is retained for reference. */ +/* Support for WIN7 and WIN8 is removed. #define's retained for reference. */ #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) @@ -557,23 +557,12 @@ int hv_drm_connect_vsp(struct hv_device *hdev) return ret; } - /* Negotiate the protocol version with host */ - switch (vmbus_proto_version) { - case VERSION_WIN10: - case VERSION_WIN10_V5: - ret = hv_drm_negotiate_version(hdev, SYNTHVID_VERSION_WIN10); - if (!ret) - break; - fallthrough; - case VERSION_WIN8: - case VERSION_WIN8_1: - ret = hv_drm_negotiate_version(hdev, SYNTHVID_VERSION_WIN8); - break; - default: - ret = hv_drm_negotiate_version(hdev, SYNTHVID_VERSION_WIN10); - break; - } - + /* + * Negotiate the protocol version with host. Since support for hosts + * older than WIN10 has been removed from Linux, only negotiate the + * WIN10 version. + */ + ret = hv_drm_negotiate_version(hdev, SYNTHVID_VERSION_WIN10); if (ret) { drm_err(dev, "Synthetic video device version not accepted %d\n", ret); goto error; @@ -581,11 +570,9 @@ int hv_drm_connect_vsp(struct hv_device *hdev) hv->screen_depth = SYNTHVID_DEPTH_WIN8; - if (hv_drm_version_ge(hv->synthvid_version, SYNTHVID_VERSION_WIN10)) { - ret = hv_drm_get_supported_resolution(hdev); - if (ret) - drm_err(dev, "Failed to get supported resolution from host, use default\n"); - } + ret = hv_drm_get_supported_resolution(hdev); + if (ret) + drm_err(dev, "Failed to get supported resolution from host, use default\n"); if (!hv->screen_width_max) { hv->screen_width_max = SYNTHVID_WIDTH_WIN8; -- 2.25.1