Re: [PATCH v2 1/6] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-11 Thread Maxime Ripard
On Tue, Jan 10, 2017 at 12:30:41AM +, André Przywara wrote: > On 09/01/17 16:46, Maxime Ripard wrote: > > Experience have shown that the using the autocalibration could severely > > degrade the performances of the MMC bus. > > > > Allwinner is using in its BSP a delay set to 0 for all the mod

Re: [PATCH v2 1/6] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-09 Thread André Przywara
On 09/01/17 16:46, Maxime Ripard wrote: > Experience have shown that the using the autocalibration could severely > degrade the performances of the MMC bus. > > Allwinner is using in its BSP a delay set to 0 for all the modes but HS400. > Remove the calibration code for now, and add comments to d

[PATCH v2 1/6] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-09 Thread Maxime Ripard
Experience have shown that the using the autocalibration could severely degrade the performances of the MMC bus. Allwinner is using in its BSP a delay set to 0 for all the modes but HS400. Remove the calibration code for now, and add comments to document our findings. Signed-off-by: Maxime Ripar