From: Chaotian Jing Date: Sat, 29 Sep 2018 02:29:55 +0000 (+0800) Subject: mmc: mediatek: add bus_clk control X-Git-Tag: v5.4-rc1~2435^2~41 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=258bac4a61af9c4e7bc045ce2a17c9eb8c5fd9a5;p=platform%2Fkernel%2Flinux-rpi.git 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 Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 0484138..1c1c967 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))