On Mon, Dec 07, 2015 at 11:38:49AM -0700, Stephen Warren wrote:
From: Stephen Warren swarren@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@nvidia.com
Reviewed-by: Tom Rini trini@konsulko.com