diff options
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/rockchip/clk_rk3399.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c index c0bb80c..0b4ea82 100644 --- a/drivers/clk/rockchip/clk_rk3399.c +++ b/drivers/clk/rockchip/clk_rk3399.c @@ -142,6 +142,7 @@ enum { CLK_EMMC_PLL_SHIFT = 8, CLK_EMMC_PLL_MASK = 0x7 << CLK_EMMC_PLL_SHIFT, CLK_EMMC_PLL_SEL_GPLL = 0x1, + CLK_EMMC_PLL_SEL_24M = 0x5, CLK_EMMC_DIV_CON_SHIFT = 0, CLK_EMMC_DIV_CON_MASK = 0x7f << CLK_EMMC_DIV_CON_SHIFT, @@ -642,9 +643,13 @@ static ulong rk3399_mmc_get_clk(struct rk3399_cru *cru, uint clk_id) default: return -EINVAL; } - div = (con>>CLK_EMMC_DIV_CON_SHIFT) & CLK_EMMC_DIV_CON_MASK; + div = (con & CLK_EMMC_DIV_CON_MASK) >> CLK_EMMC_DIV_CON_SHIFT; - return DIV_TO_RATE(GPLL_HZ, div); + if ((con & CLK_EMMC_PLL_MASK) >> CLK_EMMC_PLL_SHIFT + == CLK_EMMC_PLL_SEL_24M) + return DIV_TO_RATE(24*1024*1024, div); + else + return DIV_TO_RATE(GPLL_HZ, div); } static ulong rk3399_mmc_set_clk(struct rk3399_cru *cru, @@ -655,14 +660,22 @@ static ulong rk3399_mmc_set_clk(struct rk3399_cru *cru, switch (clk_id) { case SCLK_SDMMC: - /* Select clk_sdmmc source from GPLL too */ + /* Select clk_sdmmc source from GPLL by default */ src_clk_div = GPLL_HZ / set_rate; - assert(src_clk_div - 1 < 127); - rk_clrsetreg(&cru->clksel_con[16], - CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK, - CLK_EMMC_PLL_SEL_GPLL << CLK_EMMC_PLL_SHIFT | - (src_clk_div - 1) << CLK_EMMC_DIV_CON_SHIFT); + if (src_clk_div > 127) { + /* use 24MHz source for 400KHz clock */ + src_clk_div = 24*1024*1024 / set_rate; + rk_clrsetreg(&cru->clksel_con[16], + CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK, + CLK_EMMC_PLL_SEL_24M << CLK_EMMC_PLL_SHIFT | + (src_clk_div - 1) << CLK_EMMC_DIV_CON_SHIFT); + } else { + rk_clrsetreg(&cru->clksel_con[16], + CLK_EMMC_PLL_MASK | CLK_EMMC_DIV_CON_MASK, + CLK_EMMC_PLL_SEL_GPLL << CLK_EMMC_PLL_SHIFT | + (src_clk_div - 1) << CLK_EMMC_DIV_CON_SHIFT); + } break; case SCLK_EMMC: /* Select aclk_emmc source from GPLL */ |