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Date:   Mon, 21 Oct 2019 16:47:29 +0300
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Stuart Hayes <stuart.w.hayes@gmail.com>
Cc:     Bjorn Helgaas <bhelgaas@google.com>,
        Austin Bolen <austin_bolen@dell.com>, keith.busch@intel.com,
        Alexandru Gagniuc <mr.nuke.me@gmail.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        "Gustavo A . R . Silva" <gustavo@embeddedor.com>,
        Sinan Kaya <okaya@kernel.org>,
        Oza Pawandeep <poza@codeaurora.org>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, lukas@wunner.de
Subject: Re: [PATCH v3 3/3] PCI: pciehp: Add dmi table for in-band presence
 disabled
Message-ID: <20191021134729.GL2819@lahna.fi.intel.com>
References: <20191017193256.3636-1-stuart.w.hayes@gmail.com>
 <20191017193256.3636-4-stuart.w.hayes@gmail.com>
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On Thu, Oct 17, 2019 at 03:32:56PM -0400, Stuart Hayes wrote:
> 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 <stuart.w.hayes@gmail.com>
> ---
>  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 02eb811a014f..4d377a2a62ce 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 <linux/dmi.h>
>  #include <linux/kernel.h>
>  #include <linux/types.h>
>  #include <linux/jiffies.h>
> @@ -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"),

Sorry if this has been discussed previously already but isn't this going
to apply on all Dell systems, not just the affected ones? Is this the
intention?