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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Edgar Cherkasov <echerkasov@dev.rtsoft.ru>,
	Michael Brunner <Michael.Brunner@kontron.com>,
	Viktor Krasnov <vkrasnov@dev.rtsoft.ru>,
	Jean Delvare <jdelvare@suse.de>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Wolfram Sang <wsa@the-dreams.de>,
	Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 3.18 07/47] i2c: i2c-scmi: add a MS HID
Date: Fri, 23 Mar 2018 10:54:58 +0100	[thread overview]
Message-ID: <20180323094248.435128683@linuxfoundation.org> (raw)
In-Reply-To: <20180323094248.117679641@linuxfoundation.org>

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>


[ Upstream commit e058e7a4bc89104540a8a303682248614b5df6f1 ]

Description of the problem:
 - i2c-scmi driver contains only two identifiers "SMBUS01" and "SMBUSIBM";
 - the fist HID (SMBUS01) is clearly defined in "SMBus Control Method
   Interface Specification, version 1.0": "Each device must specify
   'SMBUS01' as its _HID and use a unique _UID value";
 - unfortunately, BIOS vendors (like AMI) seem to ignore this requirement
   and implement "SMB0001" HID instead of "SMBUS01";
 - I speculate that they do this because only "SMB0001" is hard coded in
   Windows SMBus driver produced by Microsoft.

This leads to following situation:
 - SMBus works out of box in Windows but not in Linux;
 - board vendors are forced to add correct "SMBUS01" HID to BIOS to make
   SMBus work in Linux. Moreover the same board vendors complain that
   tools (3-rd party ASL compiler) do not like the "SMBUS01" identifier
   and produce errors.  So they need to constantly patch the compiler for
   each new version of BIOS.

As it is very unlikely that BIOS vendors implement a correct HID in
future, I would propose to consider whether it is possible to work around
the problem by adding MS HID to the Linux i2c-scmi driver.

v2: move the definition of the new HID to the driver itself.

Signed-off-by: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
Signed-off-by: Michael Brunner <Michael.Brunner@kontron.com>
Acked-by: Viktor Krasnov <vkrasnov@dev.rtsoft.ru>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/i2c/busses/i2c-scmi.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/i2c/busses/i2c-scmi.c
+++ b/drivers/i2c/busses/i2c-scmi.c
@@ -18,6 +18,9 @@
 #define ACPI_SMBUS_HC_CLASS		"smbus"
 #define ACPI_SMBUS_HC_DEVICE_NAME	"cmi"
 
+/* SMBUS HID definition as supported by Microsoft Windows */
+#define ACPI_SMBUS_MS_HID		"SMB0001"
+
 ACPI_MODULE_NAME("smbus_cmi");
 
 struct smbus_methods_t {
@@ -51,6 +54,7 @@ static const struct smbus_methods_t ibm_
 static const struct acpi_device_id acpi_smbus_cmi_ids[] = {
 	{"SMBUS01", (kernel_ulong_t)&smbus_methods},
 	{ACPI_SMBUS_IBM_HID, (kernel_ulong_t)&ibm_smbus_methods},
+	{ACPI_SMBUS_MS_HID, (kernel_ulong_t)&smbus_methods},
 	{"", 0}
 };
 MODULE_DEVICE_TABLE(acpi, acpi_smbus_cmi_ids);

  parent reply	other threads:[~2018-03-23  9:54 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-23  9:54 [PATCH 3.18 00/47] 3.18.102-stable review Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 01/47] platform/x86: asus-nb-wmi: Add wapf4 quirk for the X302UA Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 02/47] x86: i8259: export legacy_pic symbol Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 03/47] Input: ar1021_i2c - fix too long name in drivers device table Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 04/47] ACPI/processor: Replace racy task affinity logic Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 05/47] cpufreq/sh: " Greg Kroah-Hartman
2018-03-23  9:54 ` [PATCH 3.18 06/47] genirq: Use irqd_get_trigger_type to compare the trigger type for shared IRQs Greg Kroah-Hartman
2018-03-23  9:54 ` Greg Kroah-Hartman [this message]
2018-03-23  9:54 ` [PATCH 3.18 08/47] net: ipv6: send unsolicited NA on admin up Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 09/47] [media] media/dvb-core: Race condition when writing to CAM Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 10/47] spi: dw: Disable clock after unregistering the host Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 11/47] ath: Fix updating radar flags for coutry code India Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 12/47] scsi: virtio_scsi: Always try to read VPD pages Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 13/47] KVM: PPC: Book3S PR: Exit KVM on failed mapping Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 14/47] tcp: remove poll() flakes with FastOpen Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 15/47] e1000e: fix timing for 82579 Gigabit Ethernet controller Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 16/47] ALSA: hda - Fix headset microphone detection for ASUS N551 and N751 Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 17/47] IB/ipoib: Update broadcast object if PKey value was changed in index 0 Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 18/47] HSI: ssi_protocol: double free in ssip_pn_xmit() Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 19/47] Fix driver usage of 128B WQEs when WQ_CREATE is V1 Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 20/47] mmc: host: omap_hsmmc: checking for NULL instead of IS_ERR() Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 21/47] wan: pc300too: abort path on failure Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 22/47] qlcnic: fix unchecked return value Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 23/47] scsi: mac_esp: Replace bogus memory barrier with spinlock Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 24/47] rndis_wlan: add return value validation Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 25/47] Btrfs: send, fix file hole not being preserved due to inline extent Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 26/47] mac80211: dont parse encrypted management frames in ieee80211_frame_acked Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 27/47] mfd: palmas: Reset the POWERHOLD mux during power off Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 28/47] ARM: DRA7: clockdomain: Change the CLKTRCTRL of CM_PCIE_CLKSTCTRL to SW_WKUP Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 29/47] ipmi/watchdog: fix wdog hang on panic waiting for ipmi response Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 30/47] bnx2x: Align RX buffers Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 31/47] power: supply: pda_power: move from timer to delayed_work Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 32/47] md/raid10: skip spare disk as first disk Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 33/47] ia64: fix module loading for gcc-5.4 Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 34/47] video: fbdev: udlfb: Fix buffer on stack Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 35/47] sm501fb: dont return zero on failure path in sm501fb_start() Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 36/47] cifs: small underflow in cnvrtDosUnixTm() Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 37/47] drm/msm: fix leak in failed get_pages Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 38/47] media: bt8xx: Fix err bt878_probe() Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 39/47] media: [RESEND] media: dvb-frontends: Add delay to Si2168 restart Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 40/47] mmc: avoid removing non-removable hosts during suspend Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 41/47] IB/ipoib: Avoid memory leak if the SA returns a different DGID Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 42/47] RDMA/cma: Use correct size when writing netlink stats Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 43/47] vgacon: Set VGA struct resource types Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 44/47] drm/omap: DMM: Check for DMM readiness after successful transaction commit Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 45/47] pinctrl: Really force states during suspend/resume Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 46/47] clk: si5351: Rename internal plls to avoid name collisions Greg Kroah-Hartman
2018-03-23  9:55 ` [PATCH 3.18 47/47] RDMA/ucma: Fix access to non-initialized CM_ID object Greg Kroah-Hartman
2018-03-23 14:00 ` [PATCH 3.18 00/47] 3.18.102-stable review kernelci.org bot
2018-03-23 20:43 ` Shuah Khan
2018-03-24  7:46   ` Greg Kroah-Hartman
2018-03-24  0:07 ` Guenter Roeck
2018-03-24  9:40 ` Harsh Shandilya
2018-03-24 10:05   ` Greg Kroah-Hartman

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