* [RFC PATCH i2c-next 0/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases @ 2018-09-10 21:45 Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 2/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo 0 siblings, 2 replies; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-10 21:45 UTC (permalink / raw) To: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel Cc: Jarkko Nikula, James Feist, Vernon Mauery, Jae Hyun Yoo In multi-master environment, this driver side master cannot know exactly when peer master sends data to this side master so a case can be happened that this master tries to send data through the master_xfer function but slave data from peer master is still being processed by this driver. To prevent state corruption in the case, this patch adds checking if any slave operation is ongoing and it wait up to the timeout duration before starting a master_xfer operation. Please review this patch set. Thanks, -Jae Jae Hyun Yoo (2): dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting i2c: aspeed: Add bus idle waiting logic for multi-master use cases .../devicetree/bindings/i2c/i2c-aspeed.txt | 10 ++- drivers/i2c/busses/i2c-aspeed.c | 70 +++++++++++++++---- 2 files changed, 62 insertions(+), 18 deletions(-) -- 2.18.0 ^ permalink raw reply [flat|nested] 11+ messages in thread
* [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-10 21:45 [RFC PATCH i2c-next 0/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo @ 2018-09-10 21:45 ` Jae Hyun Yoo 2018-09-18 18:02 ` Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 2/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo 1 sibling, 1 reply; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-10 21:45 UTC (permalink / raw) To: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel Cc: Jarkko Nikula, James Feist, Vernon Mauery, Jae Hyun Yoo This commit adds 'idle-wait-timeout-ms' setting which can be used for bus idle waiting logic in multi-master environment. Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> --- Documentation/devicetree/bindings/i2c/i2c-aspeed.txt | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt index 8fbd8633a387..42ecaaf67172 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt @@ -13,9 +13,13 @@ Required Properties: - interrupts : interrupt number Optional Properties: -- bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz when not - specified -- multi-master : states that there is another master active on this bus. +- bus-frequency : frequency of the bus clock in Hz defaults to 100 kHz + when not specified +- multi-master : states that there is another master active on this + bus. +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when + multi-master is set, defaults to 100 ms when not + specified. Example: -- 2.18.0 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-10 21:45 ` [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting Jae Hyun Yoo @ 2018-09-18 18:02 ` Jae Hyun Yoo 2018-09-24 21:58 ` Wolfram Sang 0 siblings, 1 reply; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-18 18:02 UTC (permalink / raw) To: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel Cc: Jarkko Nikula, James Feist, Vernon Mauery On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: > +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when > + multi-master is set, defaults to 100 ms when not > + specified. Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard property. Jae ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-18 18:02 ` Jae Hyun Yoo @ 2018-09-24 21:58 ` Wolfram Sang 2018-09-24 22:15 ` Jae Hyun Yoo 0 siblings, 1 reply; 11+ messages in thread From: Wolfram Sang @ 2018-09-24 21:58 UTC (permalink / raw) To: Jae Hyun Yoo Cc: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel, Jarkko Nikula, James Feist, Vernon Mauery [-- Attachment #1: Type: text/plain, Size: 601 bytes --] On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote: > On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: > > +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when > > + multi-master is set, defaults to 100 ms when not > > + specified. > > Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard > property. No need. This binding is not a HW description, so not a DT property in my book. I still don't understand: Your IP core in master mode does not have a BUSY bit or similar which detects when a START was detected and clears after a STOP? [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-24 21:58 ` Wolfram Sang @ 2018-09-24 22:15 ` Jae Hyun Yoo 2018-09-25 8:27 ` Wolfram Sang 0 siblings, 1 reply; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-24 22:15 UTC (permalink / raw) To: Wolfram Sang Cc: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel, Jarkko Nikula, James Feist, Vernon Mauery Hi Wolfram, On 9/24/2018 2:58 PM, Wolfram Sang wrote: > On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote: >> On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: >>> +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when >>> + multi-master is set, defaults to 100 ms when not >>> + specified. >> >> Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard >> property. > > No need. This binding is not a HW description, so not a DT property in > my book. I still don't understand: Your IP core in master mode does not > have a BUSY bit or similar which detects when a START was detected and > clears after a STOP? > Okay, I'll keep this property as it is then. Aspeed IP has the BUSY bit on the I2CD14 register and we are already using the bit in the current code for single-master use cases. Due to the bit doesn't cover well multi-master use cases so we need to improve the current busy checking logic using the 'Transfer Mode State Machine' bit fields on the same register through this patch set. Thanks for the review! Jae ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-24 22:15 ` Jae Hyun Yoo @ 2018-09-25 8:27 ` Wolfram Sang 2018-09-25 16:20 ` Jae Hyun Yoo 0 siblings, 1 reply; 11+ messages in thread From: Wolfram Sang @ 2018-09-25 8:27 UTC (permalink / raw) To: Jae Hyun Yoo Cc: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel, Jarkko Nikula, James Feist, Vernon Mauery [-- Attachment #1: Type: text/plain, Size: 989 bytes --] On Mon, Sep 24, 2018 at 03:15:46PM -0700, Jae Hyun Yoo wrote: > Hi Wolfram, > > On 9/24/2018 2:58 PM, Wolfram Sang wrote: > > On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote: > > > On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: > > > > +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when > > > > + multi-master is set, defaults to 100 ms when not > > > > + specified. > > > > > > Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard > > > property. > > > > No need. This binding is not a HW description, so not a DT property in > > my book. I still don't understand: Your IP core in master mode does not > > have a BUSY bit or similar which detects when a START was detected and > > clears after a STOP? > > > > Okay, I'll keep this property as it is then. Sorry for the misunderstanding. I don't think this a property, at all. It doesn't describe the hardware, it is more of a configuration thing, or? [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-25 8:27 ` Wolfram Sang @ 2018-09-25 16:20 ` Jae Hyun Yoo 2018-09-26 16:20 ` Jae Hyun Yoo 0 siblings, 1 reply; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-25 16:20 UTC (permalink / raw) To: Wolfram Sang Cc: linux-aspeed, James Feist, Andrew Jeffery, openbmc, Brendan Higgins, linux-kernel, Jarkko Nikula, Vernon Mauery, linux-arm-kernel, linux-i2c On 9/25/2018 1:27 AM, Wolfram Sang wrote: > On Mon, Sep 24, 2018 at 03:15:46PM -0700, Jae Hyun Yoo wrote: >> Hi Wolfram, >> >> On 9/24/2018 2:58 PM, Wolfram Sang wrote: >>> On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote: >>>> On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: >>>>> +- idle-wait-timeout-ms : bus idle waiting timeout in milliseconds when >>>>> + multi-master is set, defaults to 100 ms when not >>>>> + specified. >>>> >>>> Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard >>>> property. >>> >>> No need. This binding is not a HW description, so not a DT property in >>> my book. I still don't understand: Your IP core in master mode does not >>> have a BUSY bit or similar which detects when a START was detected and >>> clears after a STOP? >>> >> >> Okay, I'll keep this property as it is then. > > Sorry for the misunderstanding. I don't think this a property, at all. > It doesn't describe the hardware, it is more of a configuration thing, > or? > You are right. It doesn't describe the hardware but it needs to be configurable because it very depends on the peer master's behavior. If peer master sends a long packet usually, it should have a long timeout value since a slave receiving operation takes long time, and it should be adjusted with an optimal value with taking some experiments to make it not too long. Any suggestion? Thanks, Jae ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-25 16:20 ` Jae Hyun Yoo @ 2018-09-26 16:20 ` Jae Hyun Yoo 2018-09-26 16:27 ` Wolfram Sang 0 siblings, 1 reply; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-26 16:20 UTC (permalink / raw) To: Wolfram Sang Cc: linux-aspeed, James Feist, Andrew Jeffery, openbmc, Brendan Higgins, linux-kernel, Jarkko Nikula, Vernon Mauery, linux-arm-kernel, linux-i2c On 9/25/2018 9:20 AM, Jae Hyun Yoo wrote: > On 9/25/2018 1:27 AM, Wolfram Sang wrote: >> On Mon, Sep 24, 2018 at 03:15:46PM -0700, Jae Hyun Yoo wrote: >>> Hi Wolfram, >>> >>> On 9/24/2018 2:58 PM, Wolfram Sang wrote: >>>> On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote: >>>>> On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote: >>>>>> +- idle-wait-timeout-ms : bus idle waiting timeout in >>>>>> milliseconds when >>>>>> + multi-master is set, defaults to 100 ms when not >>>>>> + specified. >>>>> >>>>> Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard >>>>> property. >>>> >>>> No need. This binding is not a HW description, so not a DT property in >>>> my book. I still don't understand: Your IP core in master mode does not >>>> have a BUSY bit or similar which detects when a START was detected and >>>> clears after a STOP? >>>> >>> >>> Okay, I'll keep this property as it is then. >> >> Sorry for the misunderstanding. I don't think this a property, at all. >> It doesn't describe the hardware, it is more of a configuration thing, >> or? >> > > You are right. It doesn't describe the hardware but it needs to be > configurable because it very depends on the peer master's behavior. > If peer master sends a long packet usually, it should have a long > timeout value since a slave receiving operation takes long time, > and it should be adjusted with an optimal value with taking some > experiments to make it not too long. Any suggestion? > Should I use timeout in struct i2c_adapter instead just like i2c-mpc does? ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-26 16:20 ` Jae Hyun Yoo @ 2018-09-26 16:27 ` Wolfram Sang 2018-09-26 16:32 ` Jae Hyun Yoo 0 siblings, 1 reply; 11+ messages in thread From: Wolfram Sang @ 2018-09-26 16:27 UTC (permalink / raw) To: Jae Hyun Yoo Cc: linux-aspeed, James Feist, Andrew Jeffery, openbmc, Brendan Higgins, linux-kernel, Jarkko Nikula, Vernon Mauery, linux-arm-kernel, linux-i2c [-- Attachment #1: Type: text/plain, Size: 103 bytes --] > Should I use timeout in struct i2c_adapter instead just like i2c-mpc > does? I would accept that. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting 2018-09-26 16:27 ` Wolfram Sang @ 2018-09-26 16:32 ` Jae Hyun Yoo 0 siblings, 0 replies; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-26 16:32 UTC (permalink / raw) To: Wolfram Sang Cc: linux-aspeed, Andrew Jeffery, Vernon Mauery, openbmc, Brendan Higgins, linux-kernel, Jarkko Nikula, James Feist, linux-arm-kernel, linux-i2c On 9/26/2018 9:27 AM, Wolfram Sang wrote: > >> Should I use timeout in struct i2c_adapter instead just like i2c-mpc >> does? > > I would accept that. > Okay, I will submit a new patch set. Thanks! Jae ^ permalink raw reply [flat|nested] 11+ messages in thread
* [RFC PATCH i2c-next 2/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases 2018-09-10 21:45 [RFC PATCH i2c-next 0/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting Jae Hyun Yoo @ 2018-09-10 21:45 ` Jae Hyun Yoo 1 sibling, 0 replies; 11+ messages in thread From: Jae Hyun Yoo @ 2018-09-10 21:45 UTC (permalink / raw) To: Brendan Higgins, Benjamin Herrenschmidt, Joel Stanley, Andrew Jeffery, linux-i2c, openbmc, linux-arm-kernel, linux-aspeed, linux-kernel Cc: Jarkko Nikula, James Feist, Vernon Mauery, Jae Hyun Yoo In multi-master environment, this driver side master cannot know exactly when peer master sends data to this side master so a case can be happened that this master tries to send data through the master_xfer function but slave data from peer master is still being processed by this driver. To prevent state corruption in the case, this patch adds checking if any slave operation is ongoing and it wait up to the timeout duration before starting a master_xfer operation. Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com> --- drivers/i2c/busses/i2c-aspeed.c | 70 ++++++++++++++++++++++++++------- 1 file changed, 55 insertions(+), 15 deletions(-) diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index c258c4d9a4c0..73359eda98be 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/completion.h> +#include <linux/delay.h> #include <linux/err.h> #include <linux/errno.h> #include <linux/i2c.h> @@ -99,6 +100,7 @@ ASPEED_I2CD_INTR_TX_ACK) /* 0x14 : I2CD Command/Status Register */ +#define ASPEED_I2CD_XFER_MODE_STS_MASK GENMASK(22, 19) #define ASPEED_I2CD_SCL_LINE_STS BIT(18) #define ASPEED_I2CD_SDA_LINE_STS BIT(17) #define ASPEED_I2CD_BUS_BUSY_STS BIT(16) @@ -115,6 +117,10 @@ /* 0x18 : I2CD Slave Device Address Register */ #define ASPEED_I2CD_DEV_ADDR_MASK GENMASK(6, 0) +/* Timeout for bus busy checking */ +#define ASPEED_I2CD_IDLE_WAIT_TIMEOUT_MS_DEFAULT 100 /* 100 ms */ +#define ASPEED_I2CD_BUS_BUSY_CHECK_INTERVAL_US 10000 /* 10 ms */ + enum aspeed_i2c_master_state { ASPEED_I2C_MASTER_INACTIVE, ASPEED_I2C_MASTER_START, @@ -155,6 +161,9 @@ struct aspeed_i2c_bus { int cmd_err; /* Protected only by i2c_lock_bus */ int master_xfer_result; + /* Multi-master */ + bool multi_master; + u32 idle_wait_timeout_ms; #if IS_ENABLED(CONFIG_I2C_SLAVE) struct i2c_client *slave; enum aspeed_i2c_slave_state slave_state; @@ -590,27 +599,49 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id) return irq_remaining ? IRQ_NONE : IRQ_HANDLED; } +static int aspeed_i2c_check_bus_busy(struct aspeed_i2c_bus *bus) +{ + u32 status_check_mask = ASPEED_I2CD_BUS_BUSY_STS; + ktime_t timeout; + + if (bus->multi_master) { + might_sleep(); + timeout = ktime_add_ms(ktime_get(), bus->idle_wait_timeout_ms); + /* + * ASPEED_I2CD_XFER_MODE_STS_MASK is marked as + * 'for debugging purpose only' in datasheet but ASPEED + * confirmed that this reflects real information and good to be + * used in practical code. It will be used only in multi-master + * use cases. + */ + status_check_mask |= ASPEED_I2CD_XFER_MODE_STS_MASK; + } + + for (;;) { + if (!(readl(bus->base + ASPEED_I2C_CMD_REG) & + status_check_mask)) + return 0; + if (!bus->multi_master) + break; + if (ktime_compare(ktime_get(), timeout) > 0) + break; + usleep_range((ASPEED_I2CD_BUS_BUSY_CHECK_INTERVAL_US >> 2) + 1, + ASPEED_I2CD_BUS_BUSY_CHECK_INTERVAL_US); + } + + return aspeed_i2c_recover_bus(bus); +} + static int aspeed_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { struct aspeed_i2c_bus *bus = i2c_get_adapdata(adap); unsigned long time_left, flags; - int ret = 0; - - spin_lock_irqsave(&bus->lock, flags); - bus->cmd_err = 0; - /* If bus is busy, attempt recovery. We assume a single master - * environment. - */ - if (readl(bus->base + ASPEED_I2C_CMD_REG) & ASPEED_I2CD_BUS_BUSY_STS) { - spin_unlock_irqrestore(&bus->lock, flags); - ret = aspeed_i2c_recover_bus(bus); - if (ret) - return ret; - spin_lock_irqsave(&bus->lock, flags); - } + if (aspeed_i2c_check_bus_busy(bus)) + return -EAGAIN; + spin_lock_irqsave(&bus->lock, flags); bus->cmd_err = 0; bus->msgs = msgs; bus->msgs_index = 0; @@ -798,8 +829,17 @@ static int aspeed_i2c_init(struct aspeed_i2c_bus *bus, if (ret < 0) return ret; - if (!of_property_read_bool(pdev->dev.of_node, "multi-master")) + if (of_property_read_bool(pdev->dev.of_node, "multi-master")) { + bus->multi_master = true; + ret = of_property_read_u32(pdev->dev.of_node, + "idle-wait-timeout-ms", + &bus->idle_wait_timeout_ms); + if (ret) + bus->idle_wait_timeout_ms = + ASPEED_I2CD_IDLE_WAIT_TIMEOUT_MS_DEFAULT; + } else { fun_ctrl_reg |= ASPEED_I2CD_MULTI_MASTER_DIS; + } /* Enable Master Mode */ writel(readl(bus->base + ASPEED_I2C_FUN_CTRL_REG) | fun_ctrl_reg, -- 2.18.0 ^ permalink raw reply related [flat|nested] 11+ messages in thread
end of thread, other threads:[~2018-09-26 16:33 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-09-10 21:45 [RFC PATCH i2c-next 0/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting Jae Hyun Yoo 2018-09-18 18:02 ` Jae Hyun Yoo 2018-09-24 21:58 ` Wolfram Sang 2018-09-24 22:15 ` Jae Hyun Yoo 2018-09-25 8:27 ` Wolfram Sang 2018-09-25 16:20 ` Jae Hyun Yoo 2018-09-26 16:20 ` Jae Hyun Yoo 2018-09-26 16:27 ` Wolfram Sang 2018-09-26 16:32 ` Jae Hyun Yoo 2018-09-10 21:45 ` [RFC PATCH i2c-next 2/2] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Jae Hyun Yoo
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