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Date: Wed, 21 Apr 2010 14:39:30 -0700
From: Stefan Bader <stefan.bader@...onical.com>
To: linux-kernel@...r.kernel.org
CC: astarikovskiy@...e.de, ben@...adent.org.uk, gregkh@...e.de,
len.brown@...el.com, stable@...nel.org,
stable-commits@...r.kernel.org
Subject: Re: patch acpi-ec-allow-multibyte-access-to-ec.patch added to 2.6.33-stable
tree
gregkh@...e.de wrote:
> This is a note to let you know that we have just queued up the patch titled
>
> Subject: ACPI: EC: Allow multibyte access to EC
>
> to the 2.6.33-stable tree. Its filename is
>
> acpi-ec-allow-multibyte-access-to-ec.patch
>
> A git repo of this tree can be found at
> http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>
>
> From ben@...adent.org.uk Wed Apr 21 12:11:57 2010
> From: Alexey Starikovskiy <astarikovskiy@...e.de>
> Date: Sat, 10 Apr 2010 02:18:35 +0100
> Subject: ACPI: EC: Allow multibyte access to EC
> To: stable@...nel.org
> Cc: Len Brown <len.brown@...el.com>, 563313@...s.debian.org, Alexey Starikovskiy <astarikovskiy@...e.de>
> Message-ID: <1270862315.2176.69.camel@...alhost>
>
>
> From: Alexey Starikovskiy <astarikovskiy@...e.de>
>
> commit dadf28a10c3eb29421837a2e413ab869ebd upstream
>
> http://bugzilla.kernel.org/show_bug.cgi?id=14667
>
> [bwh: Backport to 2.6.32; same applies to 2.6.33]
>
> Signed-off-by: Alexey Starikovskiy <astarikovskiy@...e.de>
> Signed-off-by: Len Brown <len.brown@...el.com>
> Cc: Ben Hutchings <ben@...adent.org.uk>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>
> ---
> drivers/acpi/acpica/exprep.c | 12 ++++++++++++
> drivers/acpi/ec.c | 35 +++++++++--------------------------
> 2 files changed, 21 insertions(+), 26 deletions(-)
>
> --- a/drivers/acpi/acpica/exprep.c
> +++ b/drivers/acpi/acpica/exprep.c
> @@ -468,6 +468,18 @@ acpi_status acpi_ex_prep_field_value(str
>
> acpi_ut_add_reference(obj_desc->field.region_obj);
>
> + /* allow full data read from EC address space */
> + if (obj_desc->field.region_obj->region.space_id ==
> + ACPI_ADR_SPACE_EC) {
> + if (obj_desc->common_field.bit_length > 8)
> + obj_desc->common_field.access_bit_width =
> + ACPI_ROUND_UP(obj_desc->common_field.
> + bit_length, 8);
> + obj_desc->common_field.access_byte_width =
> + ACPI_DIV_8(obj_desc->common_field.
> + access_bit_width);
> + }
> +
> ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
> "RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
> obj_desc->field.start_field_bit_offset,
> --- a/drivers/acpi/ec.c
> +++ b/drivers/acpi/ec.c
> @@ -589,12 +589,12 @@ static u32 acpi_ec_gpe_handler(void *dat
>
> static acpi_status
> acpi_ec_space_handler(u32 function, acpi_physical_address address,
> - u32 bits, acpi_integer *value,
> + u32 bits, acpi_integer *value64,
> void *handler_context, void *region_context)
> {
> struct acpi_ec *ec = handler_context;
> - int result = 0, i;
> - u8 temp = 0;
> + int result = 0, i, bytes = bits / 8;
> + u8 *value = (u8 *)value64;
>
> if ((address > 0xFF) || !value || !handler_context)
> return AE_BAD_PARAMETER;
> @@ -602,32 +602,15 @@ acpi_ec_space_handler(u32 function, acpi
> if (function != ACPI_READ && function != ACPI_WRITE)
> return AE_BAD_PARAMETER;
>
> - if (bits != 8 && acpi_strict)
> - return AE_BAD_PARAMETER;
> -
> - if (EC_FLAGS_MSI)
> + if (EC_FLAGS_MSI || bits > 8)
> acpi_ec_burst_enable(ec);
>
> - if (function == ACPI_READ) {
> - result = acpi_ec_read(ec, address, &temp);
> - *value = temp;
> - } else {
> - temp = 0xff & (*value);
> - result = acpi_ec_write(ec, address, temp);
> - }
> -
> - for (i = 8; unlikely(bits - i > 0); i += 8) {
> - ++address;
> - if (function == ACPI_READ) {
> - result = acpi_ec_read(ec, address, &temp);
> - (*value) |= ((acpi_integer)temp) << i;
> - } else {
> - temp = 0xff & ((*value) >> i);
> - result = acpi_ec_write(ec, address, temp);
> - }
> - }
> + for (i = 0; i < bytes; ++i, ++address, ++value)
> + result = (function == ACPI_READ) ?
> + acpi_ec_read(ec, address, value) :
> + acpi_ec_write(ec, address, *value);
>
> - if (EC_FLAGS_MSI)
> + if (EC_FLAGS_MSI || bits > 8)
> acpi_ec_burst_disable(ec);
>
> switch (result) {
>
>
> Patches currently in stable-queue which might be from astarikovskiy@...e.de are
>
> queue-2.6.33/acpi-ec-allow-multibyte-access-to-ec.patch
> --
> To unsubscribe from this list: send the line "unsubscribe stable-commits" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Greg,
make sure to also pick the following one as it fixes a regression caused by the
mulitbyte access patch.
commit 2060c44576c79086ff24718878d7edaa7384a985
Author: Alexey Starikovskiy <astarikovskiy@...e.de>
Date: Fri Apr 16 15:36:40 2010 -0400
ACPI: EC: Limit burst to 64 bits
-Stefan
--
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