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| author | Yann Gautier <yann.gautier@foss.st.com> | 2022-09-13 13:23:44 +0200 |
|---|---|---|
| committer | Jaehoon Chung <jh80.chung@samsung.com> | 2022-10-24 18:01:59 +0900 |
| commit | be1872982e425375a7da6ac75da946f9d15df405 (patch) | |
| tree | 9e59c53825a634b7e721265f7464613f2d590cd2 /drivers/mmc | |
| parent | 12fc8efe5ad3d57ee82e0a4c548f5c47f473a9b4 (diff) | |
| download | u-boot-be1872982e425375a7da6ac75da946f9d15df405.tar.gz u-boot-be1872982e425375a7da6ac75da946f9d15df405.tar.bz2 u-boot-be1872982e425375a7da6ac75da946f9d15df405.zip | |
mmc: stm32_sdmmc2: add dual data rate support
To support dual data rate with STM32 sdmmc2 driver, the dedicated bit
(DDR - BIT(18)) needs to be set in the CLKRC register. Clock bypass
(no divider) is not allowed in this case. This is required for the
eMMC DDR modes.
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/stm32_sdmmc2.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/stm32_sdmmc2.c b/drivers/mmc/stm32_sdmmc2.c index 7ab4d949e7..952d02f9b8 100644 --- a/drivers/mmc/stm32_sdmmc2.c +++ b/drivers/mmc/stm32_sdmmc2.c @@ -598,13 +598,16 @@ static int stm32_sdmmc2_set_ios(struct udevice *dev) * clk_div > 0 and NEGEDGE = 1 => command and data generated on * SDMMCCLK falling edge */ - if (desired && ((sys_clock > desired) || + if (desired && (sys_clock > desired || mmc->ddr_mode || IS_RISING_EDGE(plat->clk_reg_msk))) { clk = DIV_ROUND_UP(sys_clock, 2 * desired); if (clk > SDMMC_CLKCR_CLKDIV_MAX) clk = SDMMC_CLKCR_CLKDIV_MAX; } + if (mmc->ddr_mode) + clk |= SDMMC_CLKCR_DDR; + if (mmc->bus_width == 4) clk |= SDMMC_CLKCR_WIDBUS_4; if (mmc->bus_width == 8) |