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Commit 3c1a8844 authored by Chaotian Jing's avatar Chaotian Jing Committed by Ulf Hansson
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mmc: mediatek: add support of source_cg clock 



source clock need an independent cg to control, when doing clk mode
switch, need gate source clock to avoid hw issue(multi-bit sync hw hang)

Signed-off-by: default avatarChaotian Jing <chaotian.jing@mediatek.com>
Tested-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent d9dcbfc8

drivers/mmc/host/mtk-sd.c

+22 −1
Original line number Diff line number Diff line
@@ -372,6 +372,7 @@ struct msdc_host { 


	struct clk *src_clk;	/* msdc source clock */

	struct clk *h_clk;      /* msdc h_clk */

	struct clk *src_clk_cg; /* msdc source clock control gate */

	u32 mclk;		/* mmc subsystem clock frequency */

	u32 src_clk_freq;	/* source clock frequency */

	u32 sclk;		/* SD/MS bus clock frequency */
@@ -616,6 +617,7 @@ static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks) 


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->h_clk);

}
@@ -624,6 +626,7 @@ static void msdc_ungate_clock(struct msdc_host *host) 
{

	clk_prepare_enable(host->h_clk);

	clk_prepare_enable(host->src_clk);

	clk_prepare_enable(host->src_clk_cg);

	while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))

		cpu_relax();

}
@@ -692,6 +695,15 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz) 
			sclk = (host->src_clk_freq >> 2) / div;

		}

	}

	sdr_clr_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);

	/*

	 * As src_clk/HCLK use the same bit to gate/ungate,

	 * So if want to only gate src_clk, need gate its parent(mux).

	 */

	if (host->src_clk_cg)

		clk_disable_unprepare(host->src_clk_cg);

	else

		clk_disable_unprepare(clk_get_parent(host->src_clk));

	if (host->dev_comp->clk_div_bits == 8)

		sdr_set_field(host->base + MSDC_CFG,

			      MSDC_CFG_CKMOD | MSDC_CFG_CKDIV,
@@ -700,10 +712,14 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz) 
		sdr_set_field(host->base + MSDC_CFG,

			      MSDC_CFG_CKMOD_EXTRA | MSDC_CFG_CKDIV_EXTRA,

			      (mode << 12) | div);

	if (host->src_clk_cg)

		clk_prepare_enable(host->src_clk_cg);

	else

		clk_prepare_enable(clk_get_parent(host->src_clk));



	sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);

	while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))

		cpu_relax();

	sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);

	host->sclk = sclk;

	host->mclk = hz;

	host->timing = timing;
@@ -1822,6 +1838,11 @@ static int msdc_drv_probe(struct platform_device *pdev) 
		goto host_free;

	}



	/*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))

		host->src_clk_cg = NULL;



	host->irq = platform_get_irq(pdev, 0);

	if (host->irq < 0) {

		ret = -EINVAL;