diff options
Diffstat (limited to 'drivers/serial/tegra_hsuart.c')
| -rw-r--r-- | drivers/serial/tegra_hsuart.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/serial/tegra_hsuart.c b/drivers/serial/tegra_hsuart.c index 3709162e67dd..078e2965fafc 100644 --- a/drivers/serial/tegra_hsuart.c +++ b/drivers/serial/tegra_hsuart.c @@ -1076,14 +1076,20 @@ static unsigned long find_best_clock_source(struct tegra_uart_port *t, unsigned long fin_rate = rate; int final_index = -1; int count; + unsigned long error_2perc; pdata = u->dev->platform_data; if (!pdata || !pdata->parent_clk_count) return fin_rate; + error_2perc = (rate / 50); + for (count = 0; count < pdata->parent_clk_count; ++count) { parent_rate = pdata->parent_clk_list[count].fixed_clk_rate; + if (parent_rate < rate) + continue; + #ifndef CONFIG_ARCH_TEGRA_2x_SOC divider = clk_div71_get_divider(parent_rate, rate); @@ -1097,8 +1103,12 @@ static unsigned long find_best_clock_source(struct tegra_uart_port *t, final_index = count; fin_err = err_rate; fin_rate = new_rate; + if (fin_err < error_2perc) + break; } } + if (fin_err < error_2perc) + break; } #endif /* Get the divisor by uart controller dll/dlm */ @@ -1113,8 +1123,12 @@ static unsigned long find_best_clock_source(struct tegra_uart_port *t, final_index = count; fin_err = err_rate; fin_rate = parent_rate; + if (fin_err < error_2perc) + break; } } + if (fin_err < error_2perc) + break; } } |