ping Ulf....
2015-02-15 23:43 GMT+08:00 Barry Song <21cnbao@xxxxxxxxx>:
> From: weijun yang <york.yang@xxxxxxx>
>
> For the original tuning code, delay value is set to SD Bus Clock Delay
> Register (SD_CLK_DELAY_SETTING) as (val | (Val << 7) | (val << 16)),
> which means CLK_DELAY_IN1, CLK_DELAY_IN2 and CLK_DELAY_OUT are the
> same and with 128 steps. This is doubtful. In CSR design specification
> documents CS-304575-DR-3H, this issue is clarified, the delay[13:0] in
> SD_CLK_DELAY_SETTING is simplied to the concatenation of {CLK_DELAY_IN2,
> CLK_DELAY_IN1}.
> Besides, for CMD19 tuning, no need to set CLK_DELAY_OUT([22,16]
> of SD_CLK_DELAY_SETTING).
>
> Signed-off-by: weijun yang <york.yang@xxxxxxx>
> Signed-off-by: Barry Song <baohua.song@xxxxxxx>
> ---
> drivers/mmc/host/sdhci-sirf.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-sirf.c b/drivers/mmc/host/sdhci-sirf.c
> index f6f82ec..4331409 100644
> --- a/drivers/mmc/host/sdhci-sirf.c
> +++ b/drivers/mmc/host/sdhci-sirf.c
> @@ -56,7 +56,7 @@ static int sdhci_sirf_execute_tuning(struct sdhci_host *host, u32 opcode)
> int tuning_seq_cnt = 3;
> u8 phase, tuned_phases[SIRF_TUNING_COUNT];
> u8 tuned_phase_cnt = 0;
> - int rc, longest_range = 0;
> + int rc = 0, longest_range = 0;
> int start = -1, end = 0, tuning_value = -1, range = 0;
> u16 clock_setting;
> struct mmc_host *mmc = host->mmc;
> @@ -68,7 +68,7 @@ retry:
> phase = 0;
> do {
> sdhci_writel(host,
> - clock_setting | phase | (phase << 7) | (phase << 16),
> + clock_setting | phase,
> SDHCI_CLK_DELAY_SETTING);
>
> if (!mmc_send_tuning(mmc)) {
> @@ -102,7 +102,7 @@ retry:
> */
> phase = tuning_value;
> sdhci_writel(host,
> - clock_setting | phase | (phase << 7) | (phase << 16),
> + clock_setting | phase,
> SDHCI_CLK_DELAY_SETTING);
>
> dev_dbg(mmc_dev(mmc), "%s: Setting the tuning phase to %d\n",
> --
> 1.9.1
>
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