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Wysocki" , Mika Westerberg , Andy Shevchenko , "Gustavo A . R . Silva" , Sinan Kaya , Oza Pawandeep , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, lukas@wunner.de, Stuart Hayes Subject: [PATCH v2 3/3] PCI: pciehp: Add dmi table for in-band presence disabled Date: Fri, 11 Oct 2019 16:51:27 -0400 Message-Id: <20191011205127.4884-4-stuart.w.hayes@gmail.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20191011205127.4884-1-stuart.w.hayes@gmail.com> References: <20191011205127.4884-1-stuart.w.hayes@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some systems have in-band presence detection disabled for hot-plug PCI slots, but do not report this in the slot capabilities 2 (SLTCAP2) register. On these systems, presence detect can become active well after the link is reported to be active, which can cause the slots to be disabled after a device is connected. Add a dmi table to flag these systems as having in-band presence disabled. Signed-off-by: Stuart Hayes --- drivers/pci/hotplug/pciehp_hpc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index db5c7b082fda..f864f0875c53 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -14,6 +14,7 @@ #define dev_fmt(fmt) "pciehp: " fmt +#include #include #include #include @@ -26,6 +27,16 @@ #include "../pci.h" #include "pciehp.h" +static const struct dmi_system_id inband_presence_disabled_dmi_table[] = { + { + .ident = "Dell System", + .matches = { + DMI_MATCH(DMI_OEM_STRING, "Dell System"), + }, + }, + {} +}; + static inline struct pci_dev *ctrl_dev(struct controller *ctrl) { return ctrl->pcie->port; @@ -896,6 +907,9 @@ struct controller *pcie_init(struct pcie_device *dev) ctrl->inband_presence_disabled = 1; } + if (dmi_first_match(inband_presence_disabled_dmi_table)) + ctrl->inband_presence_disabled = 1; + /* * If empty slot's power status is on, turn power off. The IRQ isn't * requested yet, so avoid triggering a notification with this command. -- 2.18.1