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[83.149.199.196]) by smtp.googlemail.com with ESMTPSA id b136sm32442189wme.18.2019.08.19.09.07.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 09:07:21 -0700 (PDT) From: Denis Efremov To: Bjorn Helgaas Cc: Denis Efremov , Lukas Wunner , sathyanarayanan kuppuswamy , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/4] PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators Date: Mon, 19 Aug 2019 19:06:40 +0300 Message-Id: <20190819160643.27998-2-efremov@linux.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190819160643.27998-1-efremov@linux.com> References: <20190819160643.27998-1-efremov@linux.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add pciehp_set_indicators() to set power and attention indicators with a single register write. Thus, avoiding waiting twice for Command Complete. Signed-off-by: Denis Efremov --- drivers/pci/hotplug/pciehp.h | 1 + drivers/pci/hotplug/pciehp_hpc.c | 29 +++++++++++++++++++++++++++++ include/uapi/linux/pci_regs.h | 2 ++ 3 files changed, 32 insertions(+) diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index 8c51a04b8083..0e272bf3deb4 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -167,6 +167,7 @@ int pciehp_power_on_slot(struct controller *ctrl); void pciehp_power_off_slot(struct controller *ctrl); void pciehp_get_power_status(struct controller *ctrl, u8 *status); +void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn); void pciehp_set_attention_status(struct controller *ctrl, u8 status); void pciehp_get_latch_status(struct controller *ctrl, u8 *status); int pciehp_query_power_fault(struct controller *ctrl); diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c index bd990e3371e3..5474b9854a7f 100644 --- a/drivers/pci/hotplug/pciehp_hpc.c +++ b/drivers/pci/hotplug/pciehp_hpc.c @@ -443,6 +443,35 @@ void pciehp_set_attention_status(struct controller *ctrl, u8 value) pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd); } +void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn) +{ + u16 cmd = 0, mask = 0; + + if (PWR_LED(ctrl)) + switch (pwr) { + case PCI_EXP_SLTCTL_PWR_IND_ON: + case PCI_EXP_SLTCTL_PWR_IND_BLINK: + case PCI_EXP_SLTCTL_PWR_IND_OFF: + cmd |= pwr; + mask |= PCI_EXP_SLTCTL_PIC; + } + + if (ATTN_LED(ctrl)) + switch (attn) { + case PCI_EXP_SLTCTL_ATTN_IND_ON: + case PCI_EXP_SLTCTL_ATTN_IND_BLINK: + case PCI_EXP_SLTCTL_ATTN_IND_OFF: + cmd |= attn; + mask |= PCI_EXP_SLTCTL_AIC; + } + + if (cmd) { + pcie_write_cmd_nowait(ctrl, cmd, mask); + ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__, + pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, cmd); + } +} + void pciehp_green_led_on(struct controller *ctrl) { if (!PWR_LED(ctrl)) diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index f28e562d7ca8..291788b58f3a 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -591,10 +591,12 @@ #define PCI_EXP_SLTCTL_CCIE 0x0010 /* Command Completed Interrupt Enable */ #define PCI_EXP_SLTCTL_HPIE 0x0020 /* Hot-Plug Interrupt Enable */ #define PCI_EXP_SLTCTL_AIC 0x00c0 /* Attention Indicator Control */ +#define PCI_EXP_SLTCTL_ATTN_IND_NONE 0x0 /* Attention Indicator noop */ #define PCI_EXP_SLTCTL_ATTN_IND_ON 0x0040 /* Attention Indicator on */ #define PCI_EXP_SLTCTL_ATTN_IND_BLINK 0x0080 /* Attention Indicator blinking */ #define PCI_EXP_SLTCTL_ATTN_IND_OFF 0x00c0 /* Attention Indicator off */ #define PCI_EXP_SLTCTL_PIC 0x0300 /* Power Indicator Control */ +#define PCI_EXP_SLTCTL_PWR_IND_NONE 0x0 /* Power Indicator noop */ #define PCI_EXP_SLTCTL_PWR_IND_ON 0x0100 /* Power Indicator on */ #define PCI_EXP_SLTCTL_PWR_IND_BLINK 0x0200 /* Power Indicator blinking */ #define PCI_EXP_SLTCTL_PWR_IND_OFF 0x0300 /* Power Indicator off */ -- 2.21.0