On Mon, Jan 30, 2017 at 11:06:05AM +0100, Ulf Hansson wrote:

On 27 January 2017 at 22:38, Maxime Ripard
[off-list ref] wrote:

quoted

The MMC2 controller on the A64 is kind of a special beast.

While the general controller design is the same than the other MMC
controllers in the SoC, it also has a bunch of features and changes that
prevent it to be driven in the same way.

It has for example a different bus width limit, a different maximum
frequency, and, for some reason, the maximum buffer size of a DMA
descriptor.

Add a new compatible specifically for this controller.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <redacted>
Tested-by: Florian Vaussard <redacted>
---
 drivers/mmc/host/sunxi-mmc.c | 8 ++++++++
 1 file changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 6bbe61397b7c..f0f6922bca8a 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c

@@ -5,6 +5,7 @@
  * (C) Copyright 2013-2014 O2S GmbH <www.o2s.ch>
  * (C) Copyright 2013-2014 David Lanzend?rfer <david.lanzendoerfer@o2s.ch>
  * (C) Copyright 2013-2014 Hans de Goede <hdegoede@redhat.com>
+ * (C) Copyright 2017 Sootech SA
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as

@@ -1096,12 +1097,19 @@ static const struct sunxi_mmc_cfg sun50i_a64_cfg = {
        .needs_new_timings = true,
 };

+static const struct sunxi_mmc_cfg sun50i_a64_emmc_cfg = {
+       .idma_des_size_bits = 13,
+       .clk_delays = NULL,
+       .can_calibrate = true,
+};
+
 static const struct of_device_id sunxi_mmc_of_match[] = {
        { .compatible = "allwinner,sun4i-a10-mmc", .data = &sun4i_a10_cfg },
        { .compatible = "allwinner,sun5i-a13-mmc", .data = &sun5i_a13_cfg },
        { .compatible = "allwinner,sun7i-a20-mmc", .data = &sun7i_a20_cfg },
        { .compatible = "allwinner,sun9i-a80-mmc", .data = &sun9i_a80_cfg },
        { .compatible = "allwinner,sun50i-a64-mmc", .data = &sun50i_a64_cfg },
+       { .compatible = "allwinner,sun50i-a64-emmc", .data = &sun50i_a64_emmc_cfg },

This should be documented in the DTS docs for sunxi as well. I expect
you to send a patch on top to take care of that.

You're right, I'll send a patch today.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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