From: heiko@sntech.de (Heiko Stuebner)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/4] phy: rockchip-emmc: configure default output tap delay
Date: Fri, 17 Jun 2016 01:36:45 +0200 [thread overview]
Message-ID: <1614232.pce5aJ6WZ3@phil> (raw)
In-Reply-To: <1463092986-61777-3-git-send-email-briannorris@chromium.org>
Am Donnerstag, 12. Mai 2016, 15:43:05 schrieb Brian Norris:
> The output tap delay controls helps maintain the hold requirements for
> eMMC. The exact value is dependent on the SoC and other factors, though
> it isn't really an exact science. But the default of 0 is not very good,
> as it doesn't give the eMMC much hold time, so let's bump up to 4
> (approx 90 degree phase?). If we need to configure this any further
> (e.g., based on board or speed factors), we may need to consider a
> device tree representation.
>
> Suggested-by: Shawn Lin <shawn.lin@rock-chips.com>
> Signed-off-by: Brian Norris <briannorris@chromium.org>
on my rk3399-evb board the emmc still runs nicely with this patch, so
Tested-by: Heiko Stuebner <heiko@sntech.de>
next prev parent reply other threads:[~2016-06-16 23:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-12 22:43 [PATCH 1/4] phy: rockchip-emmc: give DLL some extra time to be ready Brian Norris
2016-05-12 22:43 ` [PATCH 2/4] phy: rockchip-emmc: configure frequency range and drive impedance Brian Norris
2016-05-13 1:02 ` Shawn Lin
2016-05-13 18:46 ` Doug Anderson
2016-05-13 21:04 ` Brian Norris
2016-05-24 4:51 ` Doug Anderson
2016-05-13 21:09 ` [PATCH v2 " Brian Norris
2016-05-13 22:04 ` Doug Anderson
2016-06-16 23:36 ` Heiko Stuebner
2016-06-20 13:11 ` [PATCH " Kishon Vijay Abraham I
2016-05-12 22:43 ` [PATCH 3/4] phy: rockchip-emmc: configure default output tap delay Brian Norris
2016-05-13 22:25 ` Doug Anderson
2016-05-16 4:15 ` Shawn Lin
2016-05-16 15:12 ` Doug Anderson
2016-06-16 23:36 ` Heiko Stuebner [this message]
2016-06-20 13:11 ` Kishon Vijay Abraham I
2016-05-12 22:43 ` [PATCH 4/4] phy: rockchip-emmc: reindent the register definitions Brian Norris
2016-05-13 22:26 ` Doug Anderson
2016-06-16 23:37 ` Heiko Stuebner
2016-06-20 13:12 ` Kishon Vijay Abraham I
2016-05-13 22:01 ` [PATCH 1/4] phy: rockchip-emmc: give DLL some extra time to be ready Doug Anderson
2016-06-16 23:35 ` Heiko Stuebner
2016-06-20 13:11 ` Kishon Vijay Abraham I
2016-06-20 16:19 ` Brian Norris
2016-06-20 16:25 ` Doug Anderson
2016-06-20 16:50 ` Brian Norris
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