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Here we provide a means to traverse though all supplied FSM message
sequence configurations and pick one based on our chip's capabilities.
The first one we match will be the preferred one, as they are
presented in order of preference.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Using previously added infrastructure we can now extract a device's JEDEC
ID, compare it to a list of known and supported devices and make assumptions
based on known characteristics of a given chip.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Supply a lookup table of all the devices we intend to support. This table
is used to store device information such as; a human readable device name,
their JEDEC ID (plus the extended version), sector size and amount, a bit
store of a device's capabilities, its maximum running frequency and
possible use of a per-device configuration call-back.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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JEDEC have helped to standardise a great deal of the commands which
can be issued to a Serial Flash devices. Many of the Serial Flash
Discoverable Parameters (SFDP) commands are generic across devices.
This patch provides a shared point where these commands can be
defined.
Suggested-by: Mark Brown <broonie@kernel.org>
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Once we start supporting devices it will be handy go detect them
dynamically. This will be done using the chip's unique JEDEC ID. This
patch allows us to extract a device's JEDEC ID using the a predefined
FSM register write sequence.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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When invoked the driver will attempt to read any available data from
the FSM's data register. Any data collected from this FIFO would have
originated from the flash chip.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The FSM hardware works by setting a predetermined sequence of register
writes. Rather than open coding them inside each functional block we're
going to define them in a series of formatted 'sequence structures'.
This patch provides the framework which shall be used for every action.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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This patch uses default values to initialise a connected flash chip. This
includes; a device soft reset, setting of a safe working frequency, a
switch into Fast Sequencing Mode, configuring of timing data and a purge
of the FIFO.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Here we provide the FSM's register addresses, register bit names/offsets
and some commands which will prove useful as we start bulk the FMS's
driver out with functionality.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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This is a new driver. It's used to communicate with a special type of
optimised Serial Flash Controller called the FSM. The FSM uses a subset
of the SPI protocol to communicate with supported NOR-Flash devices.
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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'is_elm_present' flag is not used anywhere. This check is implicitely
taken care while selecting appropriate ecc-scheme via DT or board-file.
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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configs
This patch
- refactors GPMC configurations based on ecc-scheme
- removed dependency on is_elm_present() flag, which is implicitely
taken care by selecting appropriate ecc-scheme
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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GPMC configs
Lots of if..then..else conditions in omap_enable_hwecc_bch() can be avoided if
code is refactored based on ecc-scheme.
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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omap_enable_hwecc_bch
This patch
- renames omap3_enable_hwecc_bch -> omap_enable_hwecc_bch to keep
nomenclature independent of any device family.
- using '__maybe_unused' instead of `ifdef based conditional compilation
to suppress warning for un-used functions
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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omap_calculate_ecc_bch
merge omap3_calculate_ecc_bch8() into omap_calculate_ecc_bch() so that
common callback can be used for both OMAP_ECC_BCH8_CODE_HW and
OMAP_ECC_BCH8_CODE_HW_DETECTION_SW
+---------------------+-------------------------------------------------------+
|ecc-scheme | nand_chip->calculate() after this patch |
+---------------------+-------------------------------------------------------+
|HAM1_ECC | omap_calculate_ecc() |
+---------------------+-------------------------------------------------------+
|BCH4_HW_DETECTION_SW | omap_calculate_ecc_bch() |
|BCH4_HW | omap_calculate_ecc_bch() |
|BCH8_HW_DETECTION_SW | omap3_calculate_ecc_bch8() -> omap_calculate_ecc_bch()|
|BCH8_HW | omap_calculate_ecc_bch() |
+---------------------+-------------------------------------------------------+
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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omap_calculate_ecc_bch
merges omap3_calculate_ecc_bch4() into omap_calculate_ecc_bch() so that
common callback can be used for both OMAP_ECC_BCH4_CODE_HW and
OMAP_ECC_BCH4_CODE_HW_DETECTION_SW ecc-schemes
+---------------------+-------------------------------------------------------+
|ecc-scheme | nand_chip->calculate() after this patch |
+---------------------+-------------------------------------------------------+
|HAM1_ECC | omap_calculate_ecc() |
+---------------------+-------------------------------------------------------+
|BCH4_HW_DETECTION_SW | omap3_calculate_ecc_bch4() -> omap_calculate_ecc_bch()|
|BCH4_HW | omap_calculate_ecc_bch() |
|BCH8_HW_DETECTION_SW | omap3_calculate_ecc_bch8() |
|BCH8_HW | omap_calculate_ecc_bch() |
+---------------------+-------------------------------------------------------+
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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ecc-scheme
OMAP NAND driver supports multiple flavours of BCH4 and BCH8 ECC algorithms.
+------+------------------------------------+---------------+---------------+
| Algo | ECC scheme |ECC calculation|Error detection|
+------+------------------------------------+---------------+---------------+
| |OMAP_ECC_BCH4_CODE_HW_DETECTION_SW |H/W (GPMC) |S/W |
| BCH4 |OMAP_ECC_BCH4_CODE_HW |H/W (GPMC) |H/W (ELM) |
+------+------------------------------------+---------------+---------------+
| |OMAP_ECC_BCH8_CODE_HW_DETECTION_SW |H/W (GPMC) |S/W |
| BCH8 |OMAP_ECC_BCH8_CODE_HW |H/W (GPMC) |H/W (ELM) |
+------+------------------------------------+---------------+---------------+
This patch refactors omap_calculate_ecc_bch() so that
- separate out ecc-scheme specific code so that common-code can be reused
between different implementations of same ECC algorithm.
- new ecc-schemes can be added with ease in future.
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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omap_calculate_ecc_bch
rename omap3_calculate_ecc_bch -> omap_calculate_ecc_bch to
keep nomenclature independent of any device family.
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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bit-flip correction logic
This patch updates following checks when bit-flips are detected by ELM:
- Do not evaluate bit-flips when un-correctable bit-flips is reported by ELM,
because as per [1] when ELM reports an un-correctable bit-flips,
'number of error' field in its ELM_LOCATION_STATUS register is also invalid.
- Return with error-code '-EBADMSG' on detection of un-correctable bit-flip.
- Return with error-code '-EBADMSG' when bit-flips position is outside current
Sector and OOB area.
[1] ELM IP spec Table-25 ELM_LOCATION_STATUS Register.
ELM_LOCATION_STATUS[8] = ECC_CORRECTABLE: Error location process exit status
0x0: ECC error location process failed.
Number of errors and error locations are invalid.
0x1: all errors were successfully located.
Number of errors and error locations are valid.
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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enhancements
Current omap_elm_correct_data() code is not scalable for future ecc-schemes
due to presence of tweaks and hard-coded macros for BCH4_ECC and BCH8_ECC
ecc-schemes at multiple places.
This patch:
- replaces 'ecc_opt' with '(info->nand.ecc.strength == BCH8_MAX_ERROR)
used to differentiate between BCH8_HW and BCH4_SW
- replaces macros (defining magic number for specific ecc-scheme) with
generic variables
- removes dependency on macros defined in elm.h (like BCHx_ECC_OOB_BYTES)
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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detection for BCHx_HW ECC schemes
As erased-pages do not have ECC stored in their OOB area, so they need to be
seperated out from programmed-pages, before doing BCH ECC correction.
In current implementation of omap_elm_correct_data() which does ECC correction
for BCHx ECC schemes, this erased-pages are detected based on specific marker
byte (reserved as 0x00) in ecc-layout.
However, this approach has some limitation like;
1) All ecc-scheme layouts do not have such Reserved byte marker to
differentiate between erased-page v/s programmed-page. Thus this is a
customized solution.
2) Reserved marker byte can itself be subjected to bit-flips causing
erased-page to be misunderstood as programmed-page.
This patch removes dependency on any marker byte in ecc-layout, instead it
compares calc_ecc[] with pattern of ECC-of-all(0xff). This implicitely
means that both 'data + oob == all(0xff).
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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variable 'eccsize' and 'ecc_vector_size'
renaming following variables as they cause confusion due to resemblence to
another similar field in 'struct nand_ecc_ctrl' (nand_chip->ecc.size).
renaming: ecc_vector_size --> ecc->bytes (info->nand.ecc.bytes)
renaming: eccsize --> actual_eccbytes (info->nand.ecc.bytes - 1) for BCH4 and BCH8
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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omap_nand_info'
Information of currently selected ECC scheme 'enum omap_ecc ecc_opt' should
available outside platform-data, so that single nand_chip->ecc callback can
support multiple ecc-scheme configurations.
Tested-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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If a write to one time programmable memory (OTP) hits the end of this
memory area, no more data can be written. The count variable in
mtdchar_write() in drivers/mtd/mtdchar.c is not decreased anymore.
We are trapped in the loop forever, mtdchar_write() will never return
in this case.
The desired behavior of a write in such a case is described in [1]:
- Try to write as much data as possible, truncate the write to fit into
the available memory and return the number of bytes that actually
have been written.
- If no data could be written at all, return -ENOSPC.
This patch fixes the behavior of OTP write if there is not enough space
for all data:
1) mtd_write_user_prot_reg() in drivers/mtd/mtdcore.c is modified to
return -ENOSPC if no data could be written at all.
2) mtdchar_write() is modified to handle -ENOSPC correctly. Exit if a
write returned -ENOSPC and yield the correct return value, either
then number of bytes that could be written, or -ENOSPC, if no data
could be written at all.
Furthermore the patch harmonizes the behavior of the OTP memory write
in drivers/mtd/devices/mtd_dataflash.c with the other implementations
and the requirements from [1]. Instead of returning -EINVAL if the data
does not fit into the OTP memory, we try to write as much data as
possible/truncate the write.
[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html
Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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fixme applied : check device size is a multiple of erasesize.
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Crash detected on sam5d35 and its pmecc nand ecc controller.
The problem was a call to chip->ecc.hwctl from nand_write_subpage_hwecc
(nand_base.c) when we write a sub page.
chip->ecc.hwctl function is not set when we are using PMECC controller.
As a workaround, set NAND_NO_SUBPAGE_WRITE for PMECC controller in
order to disable sub page access in nand_write_page.
Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Acked-by: Josh Wu <josh.wu@atmel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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1) Why add the subpage read support?
The page size of the nand chip becomes larger and larger, the imx6 has to
supports the 16K page or even bigger page. But sometimes, the upper layer only
needs a small part of the page, such as 512 bytes or less.
For example, ubiattach may only read 64 bytes per page.
2) We only enable the subpage read support when it meets the conditions:
<1> the chip is imx6 (or later chips) which can supports large nand page.
<2> the size of ECC parity is byte aligned.
If the size of ECC parity is not byte aligned, the calling of NAND_CMD_RNDOUT
will fail.
3) What does this patch do?
This patch will fake a virtual small page for the subpage read, and call the
gpmi_ecc_read_page() to do the real work.
In order to fake a virtual small page, the patch changes the BCH registers and
the bch_geometry{}. After the subpage read finished, we will restore them back.
4) Performace:
4.1) Tested with Toshiba TC58NVG2S0F(4096 + 224) with the following command:
#ubiattach /dev/ubi_ctrl -m 4
The detail information of /dev/mtd4 shows below:
--------------------------------------------------------------
#mtdinfo /dev/mtd4
mtd4
Name: test
Type: nand
Eraseblock size: 262144 bytes, 256.0 KiB
Amount of eraseblocks: 1856 (486539264 bytes, 464.0 MiB)
Minimum input/output unit size: 4096 bytes
Sub-page size: 4096 bytes
OOB size: 224 bytes
Character device major/minor: 90:8
Bad blocks are allowed: true
Device is writable: true
--------------------------------------------------------------
4.2) Before this patch:
--------------------------------------------------------------
[ 94.530495] UBI: attaching mtd4 to ubi0
[ 98.928850] UBI: scanning is finished
[ 98.953594] UBI: attached mtd4 (name "test", size 464 MiB) to ubi0
[ 98.958562] UBI: PEB size: 262144 bytes (256 KiB), LEB size: 253952 bytes
[ 98.964076] UBI: min./max. I/O unit sizes: 4096/4096, sub-page size 4096
[ 98.969518] UBI: VID header offset: 4096 (aligned 4096), data offset: 8192
[ 98.975128] UBI: good PEBs: 1856, bad PEBs: 0, corrupted PEBs: 0
[ 98.979843] UBI: user volume: 1, internal volumes: 1, max. volumes count: 128
[ 98.985878] UBI: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 2024916145
[ 98.993635] UBI: available PEBs: 0, total reserved PEBs: 1856, PEBs reserved for bad PEB handling: 40
[ 99.001807] UBI: background thread "ubi_bgt0d" started, PID 831
--------------------------------------------------------------
The attach time is about 98.9 - 94.5 = 4.4s
4.3) After this patch:
--------------------------------------------------------------
[ 286.464906] UBI: attaching mtd4 to ubi0
[ 289.186129] UBI: scanning is finished
[ 289.211416] UBI: attached mtd4 (name "test", size 464 MiB) to ubi0
[ 289.216360] UBI: PEB size: 262144 bytes (256 KiB), LEB size: 253952 bytes
[ 289.221858] UBI: min./max. I/O unit sizes: 4096/4096, sub-page size 4096
[ 289.227293] UBI: VID header offset: 4096 (aligned 4096), data offset: 8192
[ 289.232878] UBI: good PEBs: 1856, bad PEBs: 0, corrupted PEBs: 0
[ 289.237628] UBI: user volume: 0, internal volumes: 1, max. volumes count: 128
[ 289.243553] UBI: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 2024916145
[ 289.251348] UBI: available PEBs: 1812, total reserved PEBs: 44, PEBs reserved for bad PEB handling: 40
[ 289.259417] UBI: background thread "ubi_bgt0d" started, PID 847
--------------------------------------------------------------
The attach time is about 289.18 - 286.46 = 2.7s
4.4) The conclusion:
We achieve (4.4 - 2.7) / 4.4 = 38.6% faster in the ubiattach.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The nfc_geo->payload_size is equal to the mtd->writesize now,
use the nfc_geo->payload_size to replace the mtd->writesize.
This patch makes preparation for the gpmi's subpage read support.
In the subpage support, the nfc_geo->payload_size maybe smaller then
the mtd->writesize.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Add the "page" argument for the read_subpage hook. With this argument,
the implementation of this hook could prints out more accurate information
for debugging.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The nand_get_flash_type parameter "busw" input value is not used by any
branch, and it is updated before use it in the function, so remove it,
define the "busw" as an internal variable.
Signed-off-by: Cai Zhiyong <caizhiyong@huawei.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The actual ECC strength used to select the ECC scheme is 'ecc_strength'.
Use it in the error message.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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This macro is not used so it's safe to remove it.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Home routers based on SoCs like BCM53010 (AKA BCM4708) use flashes
which can be nicely partitioned with bcm47xxpart. Header bcm47xx_nvram.h
is not available on bcm53xx, so don't include it.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Our code parsing "trx" header registers few partitions at once (in one
loop iteration). Add extra check in that place.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Up to now mtd-ram devices described in device trees were only accessible
if mtd-flash or mtd-rom were also configured at linux configuration
time, because MTD_PHYSMAP_OF was only available if (MTD_CFI ||
MTD_JEDECPROBE || MTD_ROM). Allow MTD_PHYSMAP_OF selection also
when only MTD_RAM is set.
Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>
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Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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There is no point in displaying the TS5500-specific driver entries if
TS5500 board support itself isn't enabled.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Instead of writing to "nand->reg + REG_FMICSR" we write to "REG_FMICSR"
which is NULL and not a valid register.
Fixes: 8bff82cbc308 ('mtd: add nand support for w90p910 (v2)')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Check the chip->jedec_version, and print out the right information
for JEDEC compliant NAND.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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This patch adds the parsing code for the JEDEC compliant NAND.
Since we need the 0x40 as the column address, this patch also
makes the NAND_CMD_PARAM to use the 8-bit address only.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Check the return value from platform_get_irq() and propagate it in the case of
error.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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"rc" is an error code here, no need to check it a second time.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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PIO fall back is not an issue, so don't make this much noise.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Yusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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