[U-Boot] [PATCH 2/3] mmc: store hwpart in the block device

[Tom Rini]

On Mon, Dec 07, 2015 at 11:38:49AM -0700, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> This will allow us to have multiple block device structs each referring
> to the same eMMC device, yet different HW partitions.
> 
> For now, there is still a single block device per eMMC device. As before,
> this block device always accesses whichever HW partition was most recently
> selected. Clients wishing to make use of multiple block devices referring
> to different HW partitions can simply take a copy of this block device
> once it points at the correct HW partition, and use each one as they wish.
> This feature will be used by the next patch.
> 
> In the future, perhaps get_device() could be enhanced to return a
> dynamically allocated block device struct, to avoid the client needing to
> copy it in order to maintain multiple block devices. However, this would
> require all users to be updated to free those block device structs at some
> point, which is rather a large change.
> 
> Most callers of mmc_switch_part() wish to permanently switch the default
> MMC block device's HW partition. Enhance mmc_switch_part() so that it does
> this. This removes the need for callers to do this. However,
> common/env_mmc.c needs to save and restore the current HW partition. Make
> it do this more explicitly.
> 
> Replace use of mmc_switch_part() with mmc_select_hwpart() in order to
> remove duplicate code that skips the call if that HW partition is already
> selected.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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