diff options
Diffstat (limited to 'src/soc/nvidia/tegra/i2c.c')
| -rw-r--r-- | src/soc/nvidia/tegra/i2c.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/src/soc/nvidia/tegra/i2c.c b/src/soc/nvidia/tegra/i2c.c index 555d0318c1..26c2559d84 100644 --- a/src/soc/nvidia/tegra/i2c.c +++ b/src/soc/nvidia/tegra/i2c.c @@ -19,6 +19,7 @@ #include <arch/io.h> #include <console/console.h> +#include <delay.h> #include <device/i2c.h> #include <stdlib.h> #include <string.h> @@ -30,6 +31,7 @@ static void do_bus_clear(int bus) struct tegra_i2c_bus_info *info = &tegra_i2c_info[bus]; struct tegra_i2c_regs * const regs = info->base; uint32_t bc; + int i, timeout_ms = 10; // BUS CLEAR regs (from TRM): // 1. Reset the I2C controller (already done) @@ -41,16 +43,20 @@ static void do_bus_clear(int bus) write32(bc, ®s->bus_clear_config); // 4.1 Set MSTR_CONFIG_LOAD and wait for clear write32(I2C_CONFIG_LOAD_MSTR_CONFIG_LOAD_ENABLE, ®s->config_load); - do { + for (i = 0; i < timeout_ms * 10 && (read32(®s->config_load) & + I2C_CONFIG_LOAD_MSTR_CONFIG_LOAD_ENABLE); i++) { printk(BIOS_DEBUG, "%s: wait for MSTR_CONFIG_LOAD to clear\n", __func__); - } while (read32(®s->config_load) & I2C_CONFIG_LOAD_MSTR_CONFIG_LOAD_ENABLE); + udelay(100); + } // 5. Set ENABLE to start the bus clear op write32(bc | I2C_BUS_CLEAR_CONFIG_BC_ENABLE, ®s->bus_clear_config); - do { + for (i = 0; i < timeout_ms * 10 && (read32(®s->bus_clear_config) & + I2C_BUS_CLEAR_CONFIG_BC_ENABLE); i++) { printk(BIOS_DEBUG, "%s: wait for bus clear completion\n", __func__); - } while (read32(®s->bus_clear_config) & I2C_BUS_CLEAR_CONFIG_BC_ENABLE); + udelay(100); + } } static int tegra_i2c_send_recv(int bus, int read, |