[U-Boot] [PATCH V5 03/10] DWMMC: Initialise dwmci and resolve EMMC read write issues

[Amarendra Reddy]

Hi Jaehoon,
The 'timeout' value cant be removed as it is being used.

Thanks & Regards
Amarendra

On 22 January 2013 08:14, Jaehoon Chung <jh80.chung at samsung.com> wrote:

> Hi Amar,
>
> On 01/21/2013 08:43 PM, Amar wrote:
> > This patch enumerates dwmci and set auto stop command during
> > dwmci initialisation.
> > EMMC read/write is not happening in current implementation
> > due to improper fifo size computation. Hence Modified the fifo size
> > computation to resolve EMMC read write issues.
> >
> > Signed-off-by: Amar <amarendra.xt at samsung.com>
> > ---
> > Changes since V1:
> >         1)Created the macros RX_WMARK_SHIFT and RX_WMARK_MASK in header
> file.
> >
> > Changes since V2:
> >         1)Updation of commit message and resubmition of proper patch set.
> >
> > Changes since V3:
> >         1)Updated to use the macro DWMCI_CTRL_SEND_AS_CCSD instead of
> >         the hard coded value (1 << 10).
> >
> > Changes since V4:
> >         1)Updated the function dwmci_send_cmd() to use get_timer()
> instead
> >         of using mdelay(1).
> >
> >  drivers/mmc/dw_mmc.c | 23 ++++++++++++++++-------
> >  1 file changed, 16 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
> > index 4070d4e..391ed93 100644
> > --- a/drivers/mmc/dw_mmc.c
> > +++ b/drivers/mmc/dw_mmc.c
> > @@ -129,13 +129,13 @@ static int dwmci_send_cmd(struct mmc *mmc, struct
> mmc_cmd *cmd,
> >       unsigned int timeout = 100000;
> We can remove the timeout value.
> If you remove this, it looks good to me.
>
> Acked-by: Jaehoon Chung <jh80.chung at samsung.com>
>
> Best Regards,
> Jaehoon Chung
>  >       u32 retry = 10000;
> >       u32 mask, ctrl;
> > +     ulong start = get_timer(0);
> >
> >       while (dwmci_readl(host, DWMCI_STATUS) & DWMCI_BUSY) {
> > -             if (timeout == 0) {
> > +             if (get_timer(start) > timeout) {
> >                       printf("Timeout on data busy\n");
> >                       return TIMEOUT;
> >               }
> > -             timeout--;
> >       }
> >
> >       dwmci_writel(host, DWMCI_RINTSTS, DWMCI_INTMSK_ALL);
> > @@ -143,7 +143,6 @@ static int dwmci_send_cmd(struct mmc *mmc, struct
> mmc_cmd *cmd,
> >       if (data)
> >               dwmci_prepare_data(host, data);
> >
> > -
> >       dwmci_writel(host, DWMCI_CMDARG, cmd->cmdarg);
> >
> >       if (data)
> > @@ -314,7 +313,7 @@ static void dwmci_set_ios(struct mmc *mmc)
> >  static int dwmci_init(struct mmc *mmc)
> >  {
> >       struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
> > -     u32 fifo_size, fifoth_val;
> > +     u32 fifo_size, fifoth_val, ier;
> >
> >       dwmci_writel(host, DWMCI_PWREN, 1);
> >
> > @@ -323,6 +322,14 @@ static int dwmci_init(struct mmc *mmc)
> >               return -1;
> >       }
> >
> > +     /* Enumerate at 400KHz */
> > +     dwmci_setup_bus(host, mmc->f_min);
> > +
> > +     /* Set auto stop command */
> > +     ier = dwmci_readl(host, DWMCI_CTRL);
> > +     ier |= DWMCI_CTRL_SEND_AS_CCSD;
> > +     dwmci_writel(host, DWMCI_CTRL, ier);
> > +
> >       dwmci_writel(host, DWMCI_RINTSTS, 0xFFFFFFFF);
> >       dwmci_writel(host, DWMCI_INTMASK, 0);
> >
> > @@ -332,11 +339,13 @@ static int dwmci_init(struct mmc *mmc)
> >       dwmci_writel(host, DWMCI_BMOD, 1);
> >
> >       fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
> > +     fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
> >       if (host->fifoth_val)
> >               fifoth_val = host->fifoth_val;
> > -     else
> > -             fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size/2 -1) |
> > -                     TX_WMARK(fifo_size/2);
> > +     else {
> > +             fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
> > +                     TX_WMARK(fifo_size / 2);
> > +     }
> >       dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);
> >
> >       dwmci_writel(host, DWMCI_CLKENA, 0);
> >
>
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