To fix the clock divider calculation error when the controller clock same as the operating frequency. This is known as bypass mode. In this mode, the divider should be 0.
Signed-off-by: Chin Liang See clsee@altera.com Cc: Pantelis Antoniou panto@antoniou-consulting.com Cc: Rajeshwari Shinde rajeshwari.s@samsung.com Cc: Jaehoon Chung jh80.chung@samsung.com Cc: Mischa Jonker mjonker@synopsys.com --- drivers/mmc/dw_mmc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 5bf36a0..0df30bc 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -245,7 +245,10 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq) return -EINVAL; }
- div = DIV_ROUND_UP(sclk, 2 * freq); + if (sclk == freq) + div = 0; /* bypass mode */ + else + div = DIV_ROUND_UP(sclk, 2 * freq);
dwmci_writel(host, DWMCI_CLKENA, 0); dwmci_writel(host, DWMCI_CLKSRC, 0);