| Message ID | 1402381612-3029-1-git-send-email-clsee@altera.com |
|---|---|
| State | Accepted |
| Delegated to: | Pantelis Antoniou |
| Headers | show |
Hi Chin, On Jun 10, 2014, at 9:26 AM, Chin Liang See wrote: > 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); > -- > 1.7.9.5 > Applied, thanks. -- Pantelis
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);
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(-)