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f90bc0f97f
linux/drivers/char/ipmi
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Andrew Jeffery f90bc0f97f ipmi: kcs: Poll OBF briefly to reduce OBE latency 
The ASPEED KCS devices don't provide a BMC-side interrupt for the host
reading the output data register (ODR). The act of the host reading ODR
clears the output buffer full (OBF) flag in the status register (STR),
informing the BMC it can transmit a subsequent byte.

On the BMC side the KCS client must enable the OBE event *and* perform a
subsequent read of STR anyway to avoid races - the polling provides a
window for the host to read ODR if data was freshly written while
minimising BMC-side latency.

Fixes: 28651e6c42 ("ipmi: kcs_bmc: Allow clients to control KCS IRQ state")
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Message-Id: <20220812144741.240315-1-andrew@aj.id.au>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
2022-10-17 09:51:26 -05:00
..
bt-bmc.c ipmi: bt: Add ast2600 compatible string 2021-10-07 14:02:45 -05:00
ipmb_dev_int.c i2c: Make remove callback return void 2022-08-16 12:46:26 +02:00
ipmi_bt_sm.c ipmi: Clean up some printks 2020-09-15 09:57:45 -05:00
ipmi_devintf.c ipmi:devintf: Return a proper error when recv buffer too small 2021-10-05 06:54:16 -05:00
ipmi_dmi.c ipmi_si: Rework some include files 2019-08-02 07:25:03 -05:00
ipmi_dmi.h ipmi_si: Rework some include files 2019-08-02 07:25:03 -05:00
ipmi_ipmb.c Fix a bunch of little problems in IPMI 2022-10-11 10:42:25 -07:00
ipmi_kcs_sm.c ipmi: Clean up some printks 2020-09-15 09:57:45 -05:00
ipmi_msghandler.c ipmi: Remove unused struct watcher_entry 2022-09-28 06:48:54 -05:00
ipmi_plat_data.c ipmi: Handle device properties with software node API 2021-03-10 19:00:02 -06:00
ipmi_plat_data.h ipmi: Add the i2c-addr property for SSIF interfaces 2019-04-24 09:02:53 -05:00
ipmi_powernv.c ipmi:powernv: Convert ipmi_smi_t to struct ipmi_smi 2018-09-18 16:15:33 -05:00
ipmi_poweroff.c ipmi: Add an intializer for ipmi_recv_msg struct 2022-05-12 10:00:03 -05:00
ipmi_si_hardcode.c ipmi_si: Join string literals back 2021-04-02 12:53:42 -05:00
ipmi_si_hotmod.c ipmi_si: Join string literals back 2021-04-02 12:53:42 -05:00
ipmi_si_intf.c ipmi:si: Convert pr_debug() to dev_dbg() 2022-05-12 10:00:04 -05:00
ipmi_si_mem_io.c ipmi_si: Rework some include files 2019-08-02 07:25:03 -05:00
ipmi_si_parisc.c parisc: Make struct parisc_driver::remove() return void 2021-08-30 10:18:25 +02:00
ipmi_si_pci.c ipmi_si: Join string literals back 2021-04-02 12:53:42 -05:00
ipmi_si_platform.c parisc: Make struct parisc_driver::remove() return void 2021-08-30 10:18:25 +02:00
ipmi_si_port_io.c ipmi_si: Rework some include files 2019-08-02 07:25:03 -05:00
ipmi_si_sm.h ipmi_si: Rework some include files 2019-08-02 07:25:03 -05:00
ipmi_si.h parisc: Make struct parisc_driver::remove() return void 2021-08-30 10:18:25 +02:00
ipmi_smic_sm.c ipmi: Clean up some printks 2020-09-15 09:57:45 -05:00
ipmi_ssif.c Fix a bunch of little problems in IPMI 2022-10-11 10:42:25 -07:00
ipmi_watchdog.c ipmi: Add an intializer for ipmi_recv_msg struct 2022-05-12 10:00:03 -05:00
Kconfig ipmi: ssif_bmc: Add SSIF BMC driver 2022-10-17 09:51:26 -05:00
kcs_bmc_aspeed.c ipmi: kcs: Poll OBF briefly to reduce OBE latency 2022-10-17 09:51:26 -05:00
kcs_bmc_cdev_ipmi.c ipmi: Add __init/__exit annotations to module init/exit funcs 2022-09-22 10:55:46 -05:00
kcs_bmc_client.h ipmi: kcs_bmc: Allow clients to control KCS IRQ state 2021-06-21 19:50:28 -05:00
kcs_bmc_device.h ipmi: kcs_bmc: Allow clients to control KCS IRQ state 2021-06-21 19:50:28 -05:00
kcs_bmc_npcm7xx.c ipmi: kcs_bmc: Enable IBF on open 2021-06-21 19:50:28 -05:00
kcs_bmc_serio.c ipmi: Add __init/__exit annotations to module init/exit funcs 2022-09-22 10:55:46 -05:00
kcs_bmc.c ipmi: kcs_bmc: Enable IBF on open 2021-06-21 19:50:28 -05:00
kcs_bmc.h ipmi: kcs_bmc: Allow clients to control KCS IRQ state 2021-06-21 19:50:28 -05:00
Makefile ipmi: ssif_bmc: Add SSIF BMC driver 2022-10-17 09:51:26 -05:00
ssif_bmc.c ipmi: ssif_bmc: Add SSIF BMC driver 2022-10-17 09:51:26 -05:00