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[209.132.180.67]) by mx.google.com with ESMTP id e17si663493pgt.192.2019.08.27.16.43.05; Tue, 27 Aug 2019 16:43:21 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=m4kexfQT; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726252AbfH0XmM (ORCPT + 99 others); Tue, 27 Aug 2019 19:42:12 -0400 Received: from mail-io1-f65.google.com ([209.85.166.65]:44075 "EHLO mail-io1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726025AbfH0XmL (ORCPT ); Tue, 27 Aug 2019 19:42:11 -0400 Received: by mail-io1-f65.google.com with SMTP id j4so2041147iog.11; Tue, 27 Aug 2019 16:42:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=fAkCsG+LfrTL4UGMAIquUE2ULf5h5EBAaE7x0EeLZEg=; b=m4kexfQTWGYpHGXqP0LYp8yz54l7T3jjdgj8Y3To44Wtd4BVWYDmm4qpVyR0RZtBOI aSbjYbij4Z9KC8b9TzR9jK/q4wMG9QJgRuZ/687YOfaqc2+2VKdlzdFnz8JZMYbl50fo 2M/8acHcXYECd46jtqXNT6vcy3IuDNSsNRbdbfFCO7iw3AZfNehbSpX6gdHHUKtOWDNo CoiVlzPK26Ncvl+lxJE3F++6mlxWExnEnzy4rKaFzvwOX457OvfSwLii6yvtUCI/DtHv xVrfwFPQo1laViaptvFhUgDeVbW0rDtPpfORmlwRaUWgnIxKSor00hKXpH+/AIIH8Zhu TqqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=fAkCsG+LfrTL4UGMAIquUE2ULf5h5EBAaE7x0EeLZEg=; b=NpxBw/361+YePQpOm2UfaMcO1/YUX/bIr7P3PzRx3vq9sUmNcK64o1asNNOvY/+KV4 F80pGogVDNCu0u+QtVJ72J8YY23lgHFGjK6HX7Khj0ASLEoTLHrGAILL5vci7XKQvslN W4o+4vPCcvKI38Ae1pcLg3TdKwOIPwrruPnMaTaOPtVwycyio/6H8XPB8lYWdp+IiNLG rHgSiQ0++Ym0uHhndjyb2mZs4iKafqVHC/j51x33TbeEDzaC4m7pTUB0dTQgD/OMPBYY piwwXCuiFFouV2m7np6ZpbWLwFhyg3tHgAky7Clb8MAuySV3sNfk5IaGfTBgWhGn0pxo s0jg== X-Gm-Message-State: APjAAAU/EC9WC8TZYZHIlEzBNyCTYN5N6qdiqiCRPSszmaESQnRprOhM 0MmxBNgUIhaBICpU1Z7d/G4/F/oVs9qErKHfPbI= X-Received: by 2002:a6b:6e0e:: with SMTP id d14mr1075179ioh.18.1566949330504; Tue, 27 Aug 2019 16:42:10 -0700 (PDT) MIME-Version: 1.0 References: <20190819160643.27998-1-efremov@linux.com> <20190819160643.27998-2-efremov@linux.com> In-Reply-To: <20190819160643.27998-2-efremov@linux.com> From: "Oliver O'Halloran" Date: Wed, 28 Aug 2019 09:41:59 +1000 Message-ID: Subject: Re: [PATCH v3 1/4] PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators To: Denis Efremov Cc: Bjorn Helgaas , Lukas Wunner , sathyanarayanan kuppuswamy , linux-pci@vger.kernel.org, Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 20, 2019 at 2:07 AM Denis Efremov wrote: > > 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: Do you need an explicit /* fallthrough */ comment? I thought the fallthrough warning was enabled by default now. > + 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 */ I don't think pci_regs.h is the right place for this. The contents of pci_regs.h is essentially a transcription of bit definitions from the various PCI standards documents. The PCIe Base spec says the the 0b00 combination for the two-bit Power and Attn indicator fields is reserved and there's nothing suggesting that writing a zero to those fields should preserve the current value. Basicly, we now have a implementation quirk of pcie_set_indicators() masquerading as part of the standard. > #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 >