On Wed, 4 Sep 2019 at 04:28, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
>
> default_sample_phase is used to make sure the cards are enumurated
> properly and will be set to 0 if not assigned. However, the sample
> phase should depends on the tuned phase if running higher clock rate.
> If all phases work but default_sample_phase isn't assigned, driver
> set sample phase to 0 for this case, which isn't the best choice,
> because we always expect to set phase to the middle of window. To
> solve the following continually issues we have seen in the test, we
> need set phase to the more stable one, 180, if all phases work.
>
> mmcblk1: error -84 transferring data, sector 1735064, nr 8, cmd
> response 0x900, card status 0xb00
> mmcblk1: retrying using single block read
> dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
> mmcblk1: retrying because a re-tune was needed
>
> .....
>
> mmcblk1: error -84 transferring data, sector 1728672, nr 248, cmd
> response 0x900, card status 0xb00
> mmcblk1: retrying using single block read
> dwmmc_rockchip ff0f0000.dwmmc: All phases work, using default phase 0.
>
> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Is this ready to be tagged for stable, or think its better to get it
tested a while and then send a backport to Greg etc instead?
In any case, applied for next, thanks!
Kind regards
Uffe
> ---
>
> drivers/mmc/host/dw_mmc-rockchip.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
> index d4d0213..9ef9723 100644
> --- a/drivers/mmc/host/dw_mmc-rockchip.c
> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> @@ -209,9 +209,8 @@ static int dw_mci_rk3288_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
> }
>
> if (ranges[0].start == 0 && ranges[0].end == priv->num_phases - 1) {
> - clk_set_phase(priv->sample_clk, priv->default_sample_phase);
> - dev_info(host->dev, "All phases work, using default phase %d.",
> - priv->default_sample_phase);
> + clk_set_phase(priv->sample_clk, 180);
> + dev_info(host->dev, "All phases work, using phase 180.");
> goto free;
> }
>
> --
> 1.9.1
>
>
>
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