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drivers: espi: xec: Allow to intercept eSPI host suspend/reset warnings

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Fix #22188
Introduce config option to disable automatic acknowledge via
virtual wires on response to eSPI host suspend and reset warnings.
This will give the opportunity for eSPI slave systems that need to
perform preparations before reset or suspend.

Signed-off-by: Jose Alberto Meza <jose.a.meza.arellano@intel.com>
This commit is contained in:
Jose Alberto Meza 2020-01-24 15:00:41 -08:00 • committed by Johan Hedberg
commit 77b7b42f1d
2 changed files with 38 additions and 0 deletions
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13
drivers/espi/Kconfig
View file

@ -40,6 +40,19 @@ config ESPI_VWIRE_CHANNEL
help help
eSPI Controller supports virtual wires channel. eSPI Controller supports virtual wires channel.
if ESPI_VWIRE_CHANNEL
config ESPI_AUTOMATIC_WARNING_ACKNOWLEDGE
bool "Automatic acknowledge for eSPI HOST warnings"
default y
help
Enable automatic acknowledge from eSPI slave towards eSPI host
whenever it receives suspend or reset warning.
If this is disabled, it means the app wants to be give the opportunity
to prepare for either HOST suspend or reset.
endif # ESPI_VWIRE_CHANNEL
config ESPI_OOB_CHANNEL config ESPI_OOB_CHANNEL
bool "eSPI Out-of-band channel" bool "eSPI Out-of-band channel"
help help

25
drivers/espi/espi_mchp_xec.c
View file

@ -789,18 +789,43 @@ static void vw_host_rst_warn_isr(struct device *dev)
{ {
u8_t status; u8_t status;
#ifndef CONFIG_ESPI_AUTOMATIC_WARNING_ACKNOWLEDGE
struct espi_xec_data *data = (struct espi_xec_data *)(dev->driver_data);
struct espi_event evt = { ESPI_BUS_EVENT_VWIRE_RECEIVED, 0, 0 };
#endif
espi_xec_receive_vwire(dev, ESPI_VWIRE_SIGNAL_HOST_RST_WARN, &status); espi_xec_receive_vwire(dev, ESPI_VWIRE_SIGNAL_HOST_RST_WARN, &status);
#ifndef CONFIG_ESPI_AUTOMATIC_WARNING_ACKNOWLEDGE
evt.evt_details = ESPI_VWIRE_SIGNAL_HOST_RST_WARN;
evt.evt_details = ESPI_BUS_EVENT_VWIRE_RECEIVED;
espi_send_callbacks(&data->callbacks, dev, evt);
#else
k_busy_wait(ESPI_XEC_VWIRE_ACK_DELAY); k_busy_wait(ESPI_XEC_VWIRE_ACK_DELAY);
espi_xec_send_vwire(dev, ESPI_VWIRE_SIGNAL_HOST_RST_ACK, status); espi_xec_send_vwire(dev, ESPI_VWIRE_SIGNAL_HOST_RST_ACK, status);
#endif
} }
static void vw_sus_warn_isr(struct device *dev) static void vw_sus_warn_isr(struct device *dev)
{ {
u8_t status; u8_t status;
#ifndef CONFIG_ESPI_AUTOMATIC_WARNING_ACKNOWLEDGE
struct espi_xec_data *data = (struct espi_xec_data *)(dev->driver_data);
struct espi_event evt = { ESPI_BUS_EVENT_VWIRE_RECEIVED, 0, 0 };
#endif
espi_xec_receive_vwire(dev, ESPI_VWIRE_SIGNAL_SUS_WARN, &status); espi_xec_receive_vwire(dev, ESPI_VWIRE_SIGNAL_SUS_WARN, &status);
#ifndef CONFIG_ESPI_AUTOMATIC_WARNING_ACKNOWLEDGE
evt.evt_details = ESPI_BUS_EVENT_VWIRE_RECEIVED;
evt.evt_data = status;
espi_send_callbacks(&data->callbacks, dev, evt);
#else
k_busy_wait(ESPI_XEC_VWIRE_ACK_DELAY); k_busy_wait(ESPI_XEC_VWIRE_ACK_DELAY);
espi_xec_send_vwire(dev, ESPI_VWIRE_SIGNAL_SUS_ACK, status); espi_xec_send_vwire(dev, ESPI_VWIRE_SIGNAL_SUS_ACK, status);
#endif
} }
static void ibf_isr(struct device *dev) static void ibf_isr(struct device *dev)