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authorSimon Glass <sjg@chromium.org>2016-09-04 18:56:46 -0600
committerPatrick Georgi <pgeorgi@google.com>2016-10-04 21:18:21 +0200
commit584dbf2e3a1ac0638ad02c954c2d220278adfbf1 (patch)
tree58acdc38486400a2d30232ff79255fa8a515a5c9 /src/mainboard/google/gru
parent2768a119ce08893975f3bf6788fd31c7071e7c9a (diff)
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>
Diffstat (limited to 'src/mainboard/google/gru')
-rw-r--r--src/mainboard/google/gru/bootblock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mainboard/google/gru/bootblock.c b/src/mainboard/google/gru/bootblock.c
index 2214a5caf7..26af58cd81 100644
--- a/src/mainboard/google/gru/bootblock.c
+++ b/src/mainboard/google/gru/bootblock.c
@@ -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);