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

[Jaehoon Chung]

On 01/22/2013 02:55 PM, Amarendra Reddy wrote:
> Hi Jaehoon,
> The 'timeout' value cant be removed as it is being used.
Sorry..i missed it.
> 
> 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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> 
> 
> 
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