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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 <wens@csie.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chen-Yu Tsai 2017-08-10 11:29:54 +08:00 committed by Ulf Hansson
parent 41279f0197
commit 082bb85fbf
1 changed files with 5 additions and 1 deletions
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6
drivers/mmc/host/sunxi-mmc.c
View File

@ -821,6 +821,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
rval |= div - 1; rval |= div - 1;
mmc_writel(host, REG_CLKCR, rval); mmc_writel(host, REG_CLKCR, rval);
/* update card clock rate to account for internal divider */
rate /= div;
if (host->use_new_timings) { if (host->use_new_timings) {
/* Don't touch the delay bits */ /* Don't touch the delay bits */
rval = mmc_readl(host, REG_SD_NTSR); 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); 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); ret = sunxi_mmc_clk_set_phase(host, ios, rate);
if (ret) if (ret)
return ret; return ret;
@ -849,7 +853,7 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
return ret; return ret;
/* And we just enabled our clock back */ /* And we just enabled our clock back */
mmc->actual_clock = rate / div; mmc->actual_clock = rate;
return 0; return 0;
} }