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| author | Philippe Schenker <philippe.schenker@toradex.com> | 2021-10-15 10:25:51 +0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2021-10-20 17:42:55 +0200 |
| commit | 936bf172638b390c6fc5e49b461ba534a65a21c9 (patch) | |
| tree | 70f5896cf1fc3167096ee03f27f0f3b68df66484 /board/toradex | |
| parent | 463a01c7e4cd88d95a6cb8b5ae92ae2b19a8dda7 (diff) | |
| download | u-boot-936bf172638b390c6fc5e49b461ba534a65a21c9.tar.gz u-boot-936bf172638b390c6fc5e49b461ba534a65a21c9.tar.bz2 u-boot-936bf172638b390c6fc5e49b461ba534a65a21c9.zip | |
colibri-imx6ull: fix setup of nand gpmi clock
NXP used to setup the gpmi clock root from gpmi_clk in early versions
in their downstream BSP. [1]
However on mainline the gpmi clock root was always setup from enfc
since the beginning of the i.MX 6 series SoCs, which is still the same
today. [2]
NXP followed the mainline approach at some point and changed
setup_gpmi_io_clk to setup gpmi clock root from enfc which left faulty
code behind in our board file. [3]
This commit follows the change of NXP as it improves the performance of
the NAND from ~1.2 MiB/s to ~12 MiB/s. [3]
This change was verified to work in recovery-mode and u-boot loaded
from NAND on all four Colibri iMX6ULL SKUs from Toradex.
The frequency used to read the NAND, measured on RE# (Read Enable):
before this patch: 1.4 MHz
after this patch: 22 MHz
in Linux Kernel: 50 MHz
[1] https://source.codeaurora.org/external/imx/uboot-imx/tree/arch/arm/cpu/armv7/mx6/clock.c?h=nxp/imx_v2016.03_4.1.15_2.0.0_ga#n62
[2] commit 23608e23fd65 ("i.mx: add the initial support for freescale i.MX6Q processor")
[3] https://source.codeaurora.org/external/imx/uboot-imx/commit/?id=7a82a19ceabfb04bbc1591a67c99751748781c7d
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Diffstat (limited to 'board/toradex')
| -rw-r--r-- | board/toradex/colibri-imx6ull/colibri-imx6ull.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/board/toradex/colibri-imx6ull/colibri-imx6ull.c b/board/toradex/colibri-imx6ull/colibri-imx6ull.c index 01f5561596..fd54688272 100644 --- a/board/toradex/colibri-imx6ull/colibri-imx6ull.c +++ b/board/toradex/colibri-imx6ull/colibri-imx6ull.c @@ -53,8 +53,9 @@ int dram_init(void) #ifdef CONFIG_NAND_MXS static void setup_gpmi_nand(void) { - setup_gpmi_io_clk((3 << MXC_CCM_CSCDR1_BCH_PODF_OFFSET) | - (3 << MXC_CCM_CSCDR1_GPMI_PODF_OFFSET)); + setup_gpmi_io_clk((MXC_CCM_CS2CDR_ENFC_CLK_PODF(0) | + MXC_CCM_CS2CDR_ENFC_CLK_PRED(3) | + MXC_CCM_CS2CDR_ENFC_CLK_SEL(3))); } #endif /* CONFIG_NAND_MXS */ |