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gru: Increase SPI speed to 33MHz 

Increase the SPI bus speed to speed up boot time. The maximum supported
speed at 1.8V is 37.5MHz, and 33MHz is the next lowest convenient speed,
given the clock parents.

BUG=chrome-os-partner:56556
BRANCH=none
TEST=boot on gru and see that things still work correctly. Total time
spent on reading from SPI reduces from 185ms to 141ms.

Change-Id: I71436c9e343b18360fa63d528dea5cfcfbc831e6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d7576f6e53e407af61160be142c3d589e864a8cf
Original-Change-Id: I55a19f523817862e081d23469e94fd795456dd67
Original-Signed-off-by: Simon Glass <sjg@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/381313
Original-Commit-Ready: Julius Werner <jwerner@chromium.org>
Original-Tested-by: Simon Glass <sjg@google.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/16708
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Simon Glass 2016-09-04 18:56:46 -06:00 committed by Patrick Georgi
parent 2768a119ce
commit 584dbf2e3a
1 changed files with 2 additions and 1 deletions
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3
src/mainboard/google/gru/bootblock.c
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@ -82,7 +82,8 @@ void bootblock_mainboard_init(void)
/* Set pinmux and configure spi flashrom. */
write32(&rk3399_pmugrf->spi1_rxd, IOMUX_SPI1_RX);
write32(&rk3399_pmugrf->spi1_csclktx, IOMUX_SPI1_CSCLKTX);
rockchip_spi_init(CONFIG_BOOT_DEVICE_SPI_FLASH_BUS, 24750*KHz);
rockchip_spi_init(CONFIG_BOOT_DEVICE_SPI_FLASH_BUS, 33000*KHz);
rockchip_spi_set_sample_delay(CONFIG_BOOT_DEVICE_SPI_FLASH_BUS, 5);
/* Set pinmux and configure EC SPI. */
write32(&rk3399_grf->iomux_spi5, IOMUX_SPI5);