Implement support for the word delay feature of i.MX51 (and onwards) via
the ECSPI interface.
Convert the requested delay to SPI cycles and account for an extra
inter-word delay inserted by the controller in addition to the requested
number of cycles, which was observed when testing this patch.
Disable dynamic burst when word delay is set. As the configurable delay
period in the controller is inserted after bursts, the burst length must
equal the word length.
Account for word delay in the transfer time estimation for
polling_limit_us.
Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
---
drivers/spi/spi-imx.c | 93 +++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 83 insertions(+), 10 deletions(-)
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 65a8303b80b1191cd2c19d61f88836e7fd3c7ae9..c50c256e6e695659c23d5292949a98bda0a2cd1a 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -13,7 +13,9 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
+#include <linux/math.h>
#include <linux/module.h>
+#include <linux/overflow.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@@ -302,6 +304,18 @@ static bool spi_imx_can_dma(struct spi_controller *controller, struct spi_device
#define MX51_ECSPI_STAT 0x18
#define MX51_ECSPI_STAT_RR (1 << 3)
+#define MX51_ECSPI_PERIOD 0x1c
+#define MX51_ECSPI_PERIOD_MASK 0x7fff
+/*
+ * As measured on the i.MX6, the SPI host controller inserts a 4 SPI-Clock
+ * (SCLK) delay after each burst if the PERIOD reg is 0x0. This value will be
+ * called MX51_ECSPI_PERIOD_MIN_DELAY_SCK.
+ *
+ * If the PERIOD register is != 0, the controller inserts a delay of
+ * MX51_ECSPI_PERIOD_MIN_DELAY_SCK + register value + 1 SCLK after each burst.
+ */
+#define MX51_ECSPI_PERIOD_MIN_DELAY_SCK 4
+
#define MX51_ECSPI_TESTREG 0x20
#define MX51_ECSPI_TESTREG_LBC BIT(31)
@@ -653,6 +667,7 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
struct spi_device *spi, struct spi_transfer *t)
{
u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
+ u64 word_delay_sck;
u32 clk;
/* Clear BL field and set the right value */
@@ -684,6 +699,49 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
+ /* calculate word delay in SPI Clock (SCLK) cycles */
+ if (t->word_delay.value == 0) {
+ word_delay_sck = 0;
+ } else if (t->word_delay.unit == SPI_DELAY_UNIT_SCK) {
+ word_delay_sck = t->word_delay.value;
+
+ if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK)
+ word_delay_sck = 0;
+ else if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1)
+ word_delay_sck = 1;
+ else
+ word_delay_sck -= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1;
+ } else {
+ int word_delay_ns;
+
+ word_delay_ns = spi_delay_to_ns(&t->word_delay, t);
+ if (word_delay_ns < 0)
+ return word_delay_ns;
+
+ if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
+ MX51_ECSPI_PERIOD_MIN_DELAY_SCK,
+ spi_imx->spi_bus_clk)) {
+ word_delay_sck = 0;
+ } else if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
+ MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
+ spi_imx->spi_bus_clk)) {
+ word_delay_sck = 1;
+ } else {
+ word_delay_ns -= mul_u64_u32_div(NSEC_PER_SEC,
+ MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
+ spi_imx->spi_bus_clk);
+
+ word_delay_sck = DIV_U64_ROUND_UP((u64)word_delay_ns * spi_imx->spi_bus_clk,
+ NSEC_PER_SEC);
+ }
+ }
+
+ if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
+ return -EINVAL;
+
+ writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
+ spi_imx->base + MX51_ECSPI_PERIOD);
+
return 0;
}
@@ -1264,11 +1322,13 @@ static int spi_imx_setupxfer(struct spi_device *spi,
/*
* Initialize the functions for transfer. To transfer non byte-aligned
- * words, we have to use multiple word-size bursts, we can't use
- * dynamic_burst in that case.
+ * words, we have to use multiple word-size bursts. To insert word
+ * delay, the burst size has to equal the word size. We can't use
+ * dynamic_burst in these cases.
*/
if (spi_imx->devtype_data->dynamic_burst && !spi_imx->target_mode &&
!(spi->mode & SPI_CS_WORD) &&
+ !(t->word_delay.value) &&
(spi_imx->bits_per_word == 8 ||
spi_imx->bits_per_word == 16 ||
spi_imx->bits_per_word == 32)) {
@@ -1611,12 +1671,30 @@ static int spi_imx_pio_transfer_target(struct spi_device *spi,
return ret;
}
+static unsigned int spi_imx_transfer_estimate_time_us(struct spi_transfer *transfer)
+{
+ u64 result;
+
+ result = DIV_U64_ROUND_CLOSEST((u64)USEC_PER_SEC * transfer->len * BITS_PER_BYTE,
+ transfer->effective_speed_hz);
+ if (transfer->word_delay.value) {
+ unsigned int word_delay_us;
+ unsigned int words;
+
+ words = DIV_ROUND_UP(transfer->len * BITS_PER_BYTE, transfer->bits_per_word);
+ word_delay_us = DIV_ROUND_CLOSEST(spi_delay_to_ns(&transfer->word_delay, transfer),
+ NSEC_PER_USEC);
+ result += words * word_delay_us;
+ }
+
+ return min(result, U32_MAX);
+}
+
static int spi_imx_transfer_one(struct spi_controller *controller,
struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
- unsigned long hz_per_byte, byte_limit;
spi_imx_setupxfer(spi, transfer);
transfer->effective_speed_hz = spi_imx->spi_bus_clk;
@@ -1635,15 +1713,10 @@ static int spi_imx_transfer_one(struct spi_controller *controller,
*/
if (spi_imx->usedma)
return spi_imx_dma_transfer(spi_imx, transfer);
- /*
- * Calculate the estimated time in us the transfer runs. Find
- * the number of Hz per byte per polling limit.
- */
- hz_per_byte = polling_limit_us ? ((8 + 4) * USEC_PER_SEC) / polling_limit_us : 0;
- byte_limit = hz_per_byte ? transfer->effective_speed_hz / hz_per_byte : 1;
/* run in polling mode for short transfers */
- if (transfer->len < byte_limit)
+ if (transfer->len == 1 || (polling_limit_us &&
+ spi_imx_transfer_estimate_time_us(transfer) < polling_limit_us))
return spi_imx_poll_transfer(spi, transfer);
return spi_imx_pio_transfer(spi, transfer);
--
2.39.5Hi Jonas,
kernel test robot noticed the following build errors:
[auto build test ERROR on 9852d85ec9d492ebef56dc5f229416c925758edc]
url: https://github.com/intel-lab-lkp/linux/commits/Jonas-Rebmann/spi-imx-pass-struct-spi_transfer-to-prepare_transfer/20241107-233756
base: 9852d85ec9d492ebef56dc5f229416c925758edc
patch link: https://lore.kernel.org/r/20241107-imx-spi-word-delay-v1-2-2a969214d796%40pengutronix.de
patch subject: [PATCH 2/2] spi: imx: support word delay
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20241108/202411080814.OtrMOufy-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241108/202411080814.OtrMOufy-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411080814.OtrMOufy-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from drivers/spi/spi-imx.c:9:
In file included from include/linux/dmaengine.h:12:
In file included from include/linux/scatterlist.h:8:
In file included from include/linux/mm.h:2213:
include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
In file included from drivers/spi/spi-imx.c:9:
In file included from include/linux/dmaengine.h:12:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/spi/spi-imx.c:9:
In file included from include/linux/dmaengine.h:12:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/spi/spi-imx.c:9:
In file included from include/linux/dmaengine.h:12:
In file included from include/linux/scatterlist.h:9:
In file included from arch/hexagon/include/asm/io.h:328:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
>> drivers/spi/spi-imx.c:739:7: error: call to undeclared function 'FIELD_FIT'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
739 | if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
| ^
>> drivers/spi/spi-imx.c:742:9: error: call to undeclared function 'FIELD_PREP'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
742 | writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
| ^
7 warnings and 2 errors generated.
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for MODVERSIONS
Depends on [n]: MODULES [=y] && !COMPILE_TEST [=y]
Selected by [y]:
- RANDSTRUCT_FULL [=y] && (CC_HAS_RANDSTRUCT [=y] || GCC_PLUGINS [=n]) && MODULES [=y]
WARNING: unmet direct dependencies detected for GET_FREE_REGION
Depends on [n]: SPARSEMEM [=n]
Selected by [m]:
- RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]
vim +/FIELD_FIT +739 drivers/spi/spi-imx.c
665
666 static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
667 struct spi_device *spi, struct spi_transfer *t)
668 {
669 u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
670 u64 word_delay_sck;
671 u32 clk;
672
673 /* Clear BL field and set the right value */
674 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
675 if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
676 ctrl |= (spi_imx->target_burst * 8 - 1)
677 << MX51_ECSPI_CTRL_BL_OFFSET;
678 else {
679 ctrl |= (spi_imx->bits_per_word - 1)
680 << MX51_ECSPI_CTRL_BL_OFFSET;
681 }
682
683 /* set clock speed */
684 ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
685 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
686 ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
687 spi_imx->spi_bus_clk = clk;
688
689 mx51_configure_cpha(spi_imx, spi);
690
691 /*
692 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
693 * before i.mx6ul.
694 */
695 if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
696 ctrl |= MX51_ECSPI_CTRL_SMC;
697 else
698 ctrl &= ~MX51_ECSPI_CTRL_SMC;
699
700 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
701
702 /* calculate word delay in SPI Clock (SCLK) cycles */
703 if (t->word_delay.value == 0) {
704 word_delay_sck = 0;
705 } else if (t->word_delay.unit == SPI_DELAY_UNIT_SCK) {
706 word_delay_sck = t->word_delay.value;
707
708 if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK)
709 word_delay_sck = 0;
710 else if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1)
711 word_delay_sck = 1;
712 else
713 word_delay_sck -= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1;
714 } else {
715 int word_delay_ns;
716
717 word_delay_ns = spi_delay_to_ns(&t->word_delay, t);
718 if (word_delay_ns < 0)
719 return word_delay_ns;
720
721 if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
722 MX51_ECSPI_PERIOD_MIN_DELAY_SCK,
723 spi_imx->spi_bus_clk)) {
724 word_delay_sck = 0;
725 } else if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
726 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
727 spi_imx->spi_bus_clk)) {
728 word_delay_sck = 1;
729 } else {
730 word_delay_ns -= mul_u64_u32_div(NSEC_PER_SEC,
731 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
732 spi_imx->spi_bus_clk);
733
734 word_delay_sck = DIV_U64_ROUND_UP((u64)word_delay_ns * spi_imx->spi_bus_clk,
735 NSEC_PER_SEC);
736 }
737 }
738
> 739 if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
740 return -EINVAL;
741
> 742 writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
743 spi_imx->base + MX51_ECSPI_PERIOD);
744
745 return 0;
746 }
747
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Jonas,
kernel test robot noticed the following build errors:
[auto build test ERROR on 9852d85ec9d492ebef56dc5f229416c925758edc]
url: https://github.com/intel-lab-lkp/linux/commits/Jonas-Rebmann/spi-imx-pass-struct-spi_transfer-to-prepare_transfer/20241107-233756
base: 9852d85ec9d492ebef56dc5f229416c925758edc
patch link: https://lore.kernel.org/r/20241107-imx-spi-word-delay-v1-2-2a969214d796%40pengutronix.de
patch subject: [PATCH 2/2] spi: imx: support word delay
config: arc-randconfig-002-20241108 (https://download.01.org/0day-ci/archive/20241108/202411080315.8JXzpAnT-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241108/202411080315.8JXzpAnT-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411080315.8JXzpAnT-lkp@intel.com/
All errors (new ones prefixed by >>):
drivers/spi/spi-imx.c: In function 'mx51_ecspi_prepare_transfer':
>> drivers/spi/spi-imx.c:739:14: error: implicit declaration of function 'FIELD_FIT' [-Werror=implicit-function-declaration]
739 | if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
| ^~~~~~~~~
In file included from include/linux/byteorder/little_endian.h:5,
from arch/arc/include/uapi/asm/byteorder.h:16,
from include/asm-generic/bitops/le.h:6,
from arch/arc/include/asm/bitops.h:192,
from include/linux/bitops.h:68,
from include/linux/kernel.h:23,
from include/linux/clk.h:13,
from drivers/spi/spi-imx.c:6:
>> drivers/spi/spi-imx.c:742:16: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration]
742 | writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
| ^~~~~~~~~~
include/uapi/linux/byteorder/little_endian.h:34:51: note: in definition of macro '__cpu_to_le32'
34 | #define __cpu_to_le32(x) ((__force __le32)(__u32)(x))
| ^
arch/arc/include/asm/io.h:208:47: note: in expansion of macro 'writel_relaxed'
208 | #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
| ^~~~~~~~~~~~~~
drivers/spi/spi-imx.c:742:9: note: in expansion of macro 'writel'
742 | writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
| ^~~~~~
cc1: some warnings being treated as errors
vim +/FIELD_FIT +739 drivers/spi/spi-imx.c
665
666 static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
667 struct spi_device *spi, struct spi_transfer *t)
668 {
669 u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL);
670 u64 word_delay_sck;
671 u32 clk;
672
673 /* Clear BL field and set the right value */
674 ctrl &= ~MX51_ECSPI_CTRL_BL_MASK;
675 if (spi_imx->target_mode && is_imx53_ecspi(spi_imx))
676 ctrl |= (spi_imx->target_burst * 8 - 1)
677 << MX51_ECSPI_CTRL_BL_OFFSET;
678 else {
679 ctrl |= (spi_imx->bits_per_word - 1)
680 << MX51_ECSPI_CTRL_BL_OFFSET;
681 }
682
683 /* set clock speed */
684 ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
685 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
686 ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
687 spi_imx->spi_bus_clk = clk;
688
689 mx51_configure_cpha(spi_imx, spi);
690
691 /*
692 * ERR009165: work in XHC mode instead of SMC as PIO on the chips
693 * before i.mx6ul.
694 */
695 if (spi_imx->usedma && spi_imx->devtype_data->tx_glitch_fixed)
696 ctrl |= MX51_ECSPI_CTRL_SMC;
697 else
698 ctrl &= ~MX51_ECSPI_CTRL_SMC;
699
700 writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
701
702 /* calculate word delay in SPI Clock (SCLK) cycles */
703 if (t->word_delay.value == 0) {
704 word_delay_sck = 0;
705 } else if (t->word_delay.unit == SPI_DELAY_UNIT_SCK) {
706 word_delay_sck = t->word_delay.value;
707
708 if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK)
709 word_delay_sck = 0;
710 else if (word_delay_sck <= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1)
711 word_delay_sck = 1;
712 else
713 word_delay_sck -= MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1;
714 } else {
715 int word_delay_ns;
716
717 word_delay_ns = spi_delay_to_ns(&t->word_delay, t);
718 if (word_delay_ns < 0)
719 return word_delay_ns;
720
721 if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
722 MX51_ECSPI_PERIOD_MIN_DELAY_SCK,
723 spi_imx->spi_bus_clk)) {
724 word_delay_sck = 0;
725 } else if (word_delay_ns <= mul_u64_u32_div(NSEC_PER_SEC,
726 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
727 spi_imx->spi_bus_clk)) {
728 word_delay_sck = 1;
729 } else {
730 word_delay_ns -= mul_u64_u32_div(NSEC_PER_SEC,
731 MX51_ECSPI_PERIOD_MIN_DELAY_SCK + 1,
732 spi_imx->spi_bus_clk);
733
734 word_delay_sck = DIV_U64_ROUND_UP((u64)word_delay_ns * spi_imx->spi_bus_clk,
735 NSEC_PER_SEC);
736 }
737 }
738
> 739 if (!FIELD_FIT(MX51_ECSPI_PERIOD_MASK, word_delay_sck))
740 return -EINVAL;
741
> 742 writel(FIELD_PREP(MX51_ECSPI_PERIOD_MASK, word_delay_sck),
743 spi_imx->base + MX51_ECSPI_PERIOD);
744
745 return 0;
746 }
747
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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