The commit 3b804b370d ("mmc: rockchip_sdhci: Disable DMA mode using a
device tree property") and commit 2cc6cde647 ("mmc: rockchip_sdhci:
Limit number of blocks read in a single command") implemented a
workaround to fix loading a part of TF-A into SRAM from eMMC in SPL.
This has resulted in very slow read performance of FIT from eMMC in SPL
on RK3588.
Change to make use of a bounce buffer to significantly improve the read
performance when malloc_limit is large enough and use PIO mode as fall
back.
Also update the size of align_buffer to use SDHCI_DEFAULT_BOUNDARY_SIZE
instead of a hardcoded 512 * 1024.
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://patchwork.ozlabs.org/patch/1895377/
320e366321