Hi,
Removed the unnecessary CC'd.
On 07/19/2016 04:51 PM, Jin Guojun wrote:
> From: j00226943 <j00226943@xxxxxxxxxxxxxxxxxxxx>
What is j00226943?
When you send the patch for dw_mmc controller, plz use the prefix "mmc: dw_mmc: ".
>
> Two more changes:
>
> Before we send cmd,we need to set CMD bit29 to
> 1 so that CMD and DATA sent to card through the HOLD Register,
> This is the explication in synosys host:To meet the relatively
> high Input Hold Time requirement for SDR12, SDR25, and other MMC
> speed modes, you should program bit[29]use_hold_Reg of the CMD
> register to 1'b1; the output data is then registered again in the
> cclk_in_drv domain by using the Hold Register as shown in Path B
> of Figure 10-8. However, for the higher speed modes of SDR104, SDR50
> and DDR50, you can meet the much smaller Input Hold Time requirement
> of 0.8ns by bypassing the Hold Register (Path A in Figure 10-8,
> programming CMD.use_hold_reg = 1'b0) and then adding delay elements
> on the output path as indicated
>
> We have no tuning function in our drivers,so we must do the
> Function piling when we init UHS card.
Sorry..this patch is NACK.
SDMMC_CMD_USE_HOLD_REG is already used by default in dw_mmc.c
Which kernel version did you use?
>
> Signed-off-by: Jin Guojun <kid.jin@xxxxxxxxxxxxx>
> ---
> drivers/mmc/host/dw_mmc-k3.c | 6 ++++++
> drivers/mmc/host/dw_mmc.c | 2 ++
> 2 files changed, 8 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
> index 63c2e2e..2cbfcc7 100644
> --- a/drivers/mmc/host/dw_mmc-k3.c
> +++ b/drivers/mmc/host/dw_mmc-k3.c
> @@ -125,10 +125,16 @@ static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> host->bus_hz = clk_get_rate(host->biu_clk);
> }
>
> +static void dw_mci_hi6220_prepare_command(struct dw_mci *host, u32 *cmdr)
> +{
> + *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +}
> +
> static const struct dw_mci_drv_data hi6220_data = {
> .switch_voltage = dw_mci_hi6220_switch_voltage,
> .set_ios = dw_mci_hi6220_set_ios,
> .parse_dt = dw_mci_hi6220_parse_dt,
> + .prepare_command = dw_mci_hi6220_prepare_command,
> };
There is no "prepare_command" hooks.
Best Regards,
Jaehoon Chung
>
> static const struct of_device_id dw_mci_k3_match[] = {
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 9dd1bd3..047e116 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1564,6 +1564,8 @@ static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>
> if (drv_data && drv_data->execute_tuning)
> err = drv_data->execute_tuning(slot, opcode);
> + else
> + err = 0;
> return err;
> }
>
>
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