Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-25 Thread Maxime Ripard
Hi Ulf, On Tue, Jan 24, 2017 at 09:16:12AM +0100, Ulf Hansson wrote: > On 16 January 2017 at 17:56, 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

Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-24 Thread Andre Przywara
Hi Ulf, On 24/01/17 08:16, Ulf Hansson wrote: > On 16 January 2017 at 17:56, 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 HS

Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-24 Thread Ulf Hansson
On 16 January 2017 at 17:56, 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 com

[PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64

2017-01-16 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. Reviewed-by: Andre Przywara