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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-01-27 22:38:39 +0100 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-02-13 13:20:52 +0100 |
| commit | 43c15e962c1240356a7e1aeca450d783dd903c55 (patch) | |
| tree | a1442af3d40900ea30b16b087cf6249819eab7b9 /drivers/mmc | |
| parent | mmc: sunxi: Add EMMC (MMC2) controller compatible (diff) | |
| download | linux-43c15e962c1240356a7e1aeca450d783dd903c55.tar.xz linux-43c15e962c1240356a7e1aeca450d783dd903c55.zip | |
mmc: sunxi: Add more debug informations
Add a bit more debug messages that can be helpful when debugging the clock
setup.
Also fill the actual_clock field in struct mmc_host to report properly the
current frequency in debugfs.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Tested-by: Florian Vaussard <florian.vaussard@heig-vd.ch>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sunxi-mmc.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index f0f6922bca8a..6ffcd2838272 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -661,6 +661,9 @@ static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en) unsigned long expire = jiffies + msecs_to_jiffies(750); u32 rval; + dev_dbg(mmc_dev(host->mmc), "%sabling the clock\n", + oclk_en ? "en" : "dis"); + rval = mmc_readl(host, REG_CLKCR); rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON | SDXC_MASK_DATA0); @@ -737,6 +740,7 @@ static int sunxi_mmc_clk_set_phase(struct sunxi_mmc_host *host, index = SDXC_CLK_50M_DDR; } } else { + dev_dbg(mmc_dev(host->mmc), "Invalid clock... returning\n"); return -EINVAL; } @@ -749,6 +753,7 @@ static int sunxi_mmc_clk_set_phase(struct sunxi_mmc_host *host, static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, struct mmc_ios *ios) { + struct mmc_host *mmc = host->mmc; long rate; u32 rval, clock = ios->clock; int ret; @@ -757,6 +762,9 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, if (ret) return ret; + /* Our clock is gated now */ + mmc->actual_clock = 0; + if (!ios->clock) return 0; @@ -767,17 +775,17 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, rate = clk_round_rate(host->clk_mmc, clock); if (rate < 0) { - dev_err(mmc_dev(host->mmc), "error rounding clk to %d: %ld\n", + dev_err(mmc_dev(mmc), "error rounding clk to %d: %ld\n", clock, rate); return rate; } - dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %ld\n", + dev_dbg(mmc_dev(mmc), "setting clk to %d, rounded %ld\n", clock, rate); /* setting clock rate */ ret = clk_set_rate(host->clk_mmc, rate); if (ret) { - dev_err(mmc_dev(host->mmc), "error setting clk to %ld: %d\n", + dev_err(mmc_dev(mmc), "error setting clk to %ld: %d\n", rate, ret); return ret; } @@ -812,7 +820,14 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host, * least on the A64). */ - return sunxi_mmc_oclk_onoff(host, 1); + ret = sunxi_mmc_oclk_onoff(host, 1); + if (ret) + return ret; + + /* And we just enabled our clock back */ + mmc->actual_clock = rate; + + return 0; } static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) |