tree bea32a4d9767a86df3e41b09ee0ad36055f8aabe
parent 32f4738b1754a398dc60a228277fdda8f5c0c44b
author Ying-Chun Liu (PaulLiu) <paulliu@debian.org> 1549982466 +0800
committer Ying-Chun Liu (PaulLiu) <paulliu@debian.org> 1551200817 +0800

rpi3: sdhost: SDHost driver improvement

This commit improves the SDHost driver for RPi3 as following:
 * Unblock MMC_CMD(17). Using MMC_CMD(17) is more efficient on
   block reading.
 * In some low probability that SEND_OP_COND might results CRC7
   error. We can consider that the command runs correctly. We don't
   need to retry this command so removing the code for retry.
 * Using MMC_BUS_WIDTH_1 as MMC default value to improve the stability.
 * Increase the clock to 50Mhz in data mode to speed up the io.
 * Change the pull resistors configuration to gain more stability.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org>