diff options
Diffstat (limited to 'src/ec')
| -rw-r--r-- | src/ec/google/chromeec/Kconfig | 7 | ||||
| -rw-r--r-- | src/ec/google/chromeec/ec_spi.c | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/Kconfig b/src/ec/google/chromeec/Kconfig index bec12fb10a..32a42133f2 100644 --- a/src/ec/google/chromeec/Kconfig +++ b/src/ec/google/chromeec/Kconfig @@ -43,6 +43,13 @@ config EC_GOOGLE_CHROMEEC_SPI_BUS depends on EC_GOOGLE_CHROMEEC_SPI hex "SPI bus for Google's Chrome EC" +config EC_GOOGLE_CHROMEEC_SPI_WAKEUP_DELAY_US + depends on EC_GOOGLE_CHROMEEC_SPI + int + default 0 + help + Force delay after asserting /CS to allow EC to wakeup. + config EC_GOOGLE_CHROMEEC_SPI_CHIP depends on EC_GOOGLE_CHROMEEC_SPI hex diff --git a/src/ec/google/chromeec/ec_spi.c b/src/ec/google/chromeec/ec_spi.c index 4b3e587266..d11348cff7 100644 --- a/src/ec/google/chromeec/ec_spi.c +++ b/src/ec/google/chromeec/ec_spi.c @@ -18,6 +18,7 @@ */ #include <console/console.h> +#include <delay.h> #include "ec.h" #include "ec_commands.h" #include <spi-generic.h> @@ -50,6 +51,10 @@ static int crosec_spi_io(size_t req_size, size_t resp_size, void *context) spi_claim_bus(slave); + /* Allow EC to ramp up clock after being awaken. + * See chrome-os-partner:32223 for more details. */ + udelay(CONFIG_EC_GOOGLE_CHROMEEC_SPI_WAKEUP_DELAY_US); + if (spi_xfer(slave, req_buf, req_size, NULL, 0)) { printk(BIOS_ERR, "%s: Failed to send request.\n", __func__); spi_release_bus(slave); |