diff options
| author | Chaotian Jing <chaotian.jing@mediatek.com> | 2018-09-29 05:29:55 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-08 13:53:24 +0300 |
| commit | 258bac4a61af9c4e7bc045ce2a17c9eb8c5fd9a5 (patch) | |
| tree | 88bbce0cd7ca588b83c2f2d16b9fc84ff7bd1810 /drivers/mmc | |
| parent | 716b717ac07de239c6ad7bd3c38f2ef979280595 (diff) | |
| download | linux-258bac4a61af9c4e7bc045ce2a17c9eb8c5fd9a5.tar.xz | |
mmc: mediatek: add bus_clk control
when gate MSDC0_HCLK, access register will hang, even the MSDC driver
will never accessing register after HCLK was gated, but for safety, need
gate the bus_clk(which used to access register) too.
Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/mtk-sd.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 04841386b65d..1c1c9678c0e9 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -387,6 +387,7 @@ struct msdc_host { struct clk *src_clk; /* msdc source clock */ struct clk *h_clk; /* msdc h_clk */ + struct clk *bus_clk; /* bus clock which used to access register */ struct clk *src_clk_cg; /* msdc source clock control gate */ u32 mclk; /* mmc subsystem clock frequency */ u32 src_clk_freq; /* source clock frequency */ @@ -660,12 +661,14 @@ static void msdc_gate_clock(struct msdc_host *host) { clk_disable_unprepare(host->src_clk_cg); clk_disable_unprepare(host->src_clk); + clk_disable_unprepare(host->bus_clk); clk_disable_unprepare(host->h_clk); } static void msdc_ungate_clock(struct msdc_host *host) { clk_prepare_enable(host->h_clk); + clk_prepare_enable(host->bus_clk); clk_prepare_enable(host->src_clk); clk_prepare_enable(host->src_clk_cg); while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB)) @@ -1900,6 +1903,9 @@ static int msdc_drv_probe(struct platform_device *pdev) goto host_free; } + host->bus_clk = devm_clk_get(&pdev->dev, "bus_clk"); + if (IS_ERR(host->bus_clk)) + host->bus_clk = NULL; /*source clock control gate is optional clock*/ host->src_clk_cg = devm_clk_get(&pdev->dev, "source_cg"); if (IS_ERR(host->src_clk_cg)) |