[U-Boot] [PATCH v3 32/54] mmc: Calculate dwmmc FIFO threshold size if not provided

[Jaehoon Chung <jh80.chung@gmail.com>]

Hi, Simon.

On 06/24/2015 06:38 AM, Simon Glass wrote:
> We can calculate this. Add code to do this if it is not provided.

Did you consider the kernel side?

Best Regards,
Jaehoon Chung

> 
> Signed-off-by: Simon Glass <sjg@chromium.org>
> ---
> 
> Changes in v3: None
> Changes in v2: None
> 
>  drivers/mmc/dw_mmc.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
> index a034c3f..cce2a5d 100644
> --- a/drivers/mmc/dw_mmc.c
> +++ b/drivers/mmc/dw_mmc.c
> @@ -355,9 +355,15 @@ static int dwmci_init(struct mmc *mmc)
>  	dwmci_writel(host, DWMCI_IDINTEN, 0);
>  	dwmci_writel(host, DWMCI_BMOD, 1);
>  
> -	if (host->fifoth_val) {
> -		dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
> +	if (!host->fifoth_val) {
> +		uint32_t fifo_size;
> +
> +		fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
> +		fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
> +		host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
> +				TX_WMARK(fifo_size / 2);
>  	}
> +	dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
>  
>  	dwmci_writel(host, DWMCI_CLKENA, 0);
>  	dwmci_writel(host, DWMCI_CLKSRC, 0);
>