From: Chen-Yu Tsai Date: Thu, 10 Aug 2017 03:29:54 +0000 (+0800) Subject: mmc: sunxi: Fix clock rate passed to sunxi_mmc_clk_set_phase X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=082bb85fbfb4b87787229182db4d22e5ed9fc8e6;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git mmc: sunxi: Fix clock rate passed to sunxi_mmc_clk_set_phase sunxi_mmc_clk_set_phase expects the actual card clock rate to be passed to it. When the internal divider code was reworked in change ("mmc: sunxi: Support MMC DDR52 transfer mode with new timing mode"), this requirement was missed, and the module clock rate was passed in instead. This broke 8 bit DDR MMC on old controllers, as the module clock rate is double the card clock rate, for which we have no valid delay settings. Fix this by applying the internal divider to the clock rate right after we configure it in hardware. Signed-off-by: Chen-Yu Tsai Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 6c7eb859ace1..da5f46a14497 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -821,6 +821,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, rval |= div - 1; mmc_writel(host, REG_CLKCR, rval); + /* update card clock rate to account for internal divider */ + rate /= div; + if (host->use_new_timings) { /* Don't touch the delay bits */ rval = mmc_readl(host, REG_SD_NTSR); @@ -828,6 +831,7 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, mmc_writel(host, REG_SD_NTSR, rval); } + /* sunxi_mmc_clk_set_phase expects the actual card clock rate */ ret = sunxi_mmc_clk_set_phase(host, ios, rate); if (ret) return ret; @@ -849,7 +853,7 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, return ret; /* And we just enabled our clock back */ - mmc->actual_clock = rate / div; + mmc->actual_clock = rate; return 0; }