Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755269Ab3CTOCF (ORCPT ); Wed, 20 Mar 2013 10:02:05 -0400 Received: from cantor2.suse.de ([195.135.220.15]:37086 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754760Ab3CTOCD (ORCPT ); Wed, 20 Mar 2013 10:02:03 -0400 Date: Wed, 20 Mar 2013 15:02:01 +0100 Message-ID: From: Takashi Iwai To: Bjorn Helgaas Cc: Oliver Neukum , Michal Marek , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] pciehp: Add pciehp_surprise module option User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/24.2 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3467 Lines: 78 We encountered a problem that on some HP machines the Realtek PCI-e card reader device appears only when you inserted a card before the cold boot. While debugging, it turned out that the device is actually handled via PCI-e hotplug in some level. The device sends a presence change notification, and pciehp receives it, but it's ignored because of lack of the hotplug surprise (PCI_EXP_SLTCAP_HPS) capability bit. Once when this check passes, everything starts working -- the device appears upon plugging the card properly. There are a few other bug reports indicating the similar problems (e.g. on recent Dell laptops), and I guess the culprit is same. This patch adds a new module option, pciehp_surprise, to pciehp as a workaround. When pciehp_surprise=1 is given, pciehp handles the presence change as the device on/off as if PCI_EXP_SLTCAP_HPS is set. Unless it's set explicitly, there is no impact on the existing behavior. Signed-off-by: Takashi Iwai --- drivers/pci/hotplug/pciehp.h | 3 ++- drivers/pci/hotplug/pciehp_core.c | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index 2c113de..314f3be 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -44,6 +44,7 @@ extern bool pciehp_poll_mode; extern int pciehp_poll_time; extern bool pciehp_debug; extern bool pciehp_force; +extern bool pciehp_surprise; #define dbg(format, arg...) \ do { \ @@ -122,7 +123,7 @@ struct controller { #define MRL_SENS(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_MRLSP) #define ATTN_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_AIP) #define PWR_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_PIP) -#define HP_SUPR_RM(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_HPS) +#define HP_SUPR_RM(ctrl) (pciehp_surprise || ((ctrl)->slot_cap & PCI_EXP_SLTCAP_HPS)) #define EMI(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_EIP) #define NO_CMD_CMPL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS) #define PSN(ctrl) ((ctrl)->slot_cap >> 19) diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index 7d72c5e..c3a574e 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -42,6 +42,7 @@ bool pciehp_debug; bool pciehp_poll_mode; int pciehp_poll_time; bool pciehp_force; +bool pciehp_surprise; #define DRIVER_VERSION "0.4" #define DRIVER_AUTHOR "Dan Zink , Greg Kroah-Hartman , Dely Sy " @@ -55,10 +56,12 @@ module_param(pciehp_debug, bool, 0644); module_param(pciehp_poll_mode, bool, 0644); module_param(pciehp_poll_time, int, 0644); module_param(pciehp_force, bool, 0644); +module_param(pciehp_surprise, bool, 0644); MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing"); +MODULE_PARM_DESC(pciehp_surprise, "Force to set hotplug-surprise capability"); #define PCIE_MODULE_NAME "pciehp" -- 1.8.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/