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[209.132.180.67]) by mx.google.com with ESMTP id s3si13252563plq.152.2019.08.21.17.14.00; Wed, 21 Aug 2019 17:14:15 -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; 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=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729847AbfHVABR (ORCPT + 99 others); Wed, 21 Aug 2019 20:01:17 -0400 Received: from mga04.intel.com ([192.55.52.120]:7312 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728304AbfHVABR (ORCPT ); Wed, 21 Aug 2019 20:01:17 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Aug 2019 17:01:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,414,1559545200"; d="scan'208";a="190379464" Received: from skuppusw-desk.jf.intel.com (HELO skuppusw-desk.amr.corp.intel.com) ([10.54.74.33]) by orsmga002.jf.intel.com with ESMTP; 21 Aug 2019 17:01:16 -0700 Date: Wed, 21 Aug 2019 16:58:24 -0700 From: Kuppuswamy Sathyanarayanan To: Denis Efremov Cc: Bjorn Helgaas , Lukas Wunner , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/4] PCI: pciehp: Add pciehp_set_indicators() to jointly set LED indicators Message-ID: <20190821235824.GC28404@skuppusw-desk.amr.corp.intel.com> Reply-To: sathyanarayanan.kuppuswamy@linux.intel.com References: <20190819160643.27998-1-efremov@linux.com> <20190819160643.27998-2-efremov@linux.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190819160643.27998-2-efremov@linux.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 19, 2019 at 07:06:40PM +0300, 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: > + 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 */ Nitpick: Since the current patch does not use it, May be you can create a new patch for these #defines ? or you could add some info about its usage in comment section. > #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 > -- -- Sathyanarayanan Kuppuswamy Linux kernel developer