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Commit abaaf3e1 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6:
  mfd: Avoid twl6040-codec PLL reconfiguration when not needed
  mfd: Store twl6040-codec mclk configuration
parents 71ea4efe 2bd05db7

drivers/mfd/twl6040-core.c

+77 −51
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ int twl6040_power(struct twl6040 *twl6040, int on) 
		/* Default PLL configuration after power up */

		twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;

		twl6040->sysclk = 19200000;

		twl6040->mclk = 32768;

	} else {

		/* already powered-down */

		if (!twl6040->power_count) {
@@ -305,6 +306,7 @@ int twl6040_power(struct twl6040 *twl6040, int on) 
			twl6040_power_down(twl6040);

		}

		twl6040->sysclk = 0;

		twl6040->mclk = 0;

	}



out:
@@ -324,9 +326,17 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, 
	hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);

	lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);



	/* Force full reconfiguration when switching between PLL */

	if (pll_id != twl6040->pll) {

		twl6040->sysclk = 0;

		twl6040->mclk = 0;

	}



	switch (pll_id) {

	case TWL6040_SYSCLK_SEL_LPPLL:

		/* low-power PLL divider */

		/* Change the sysclk configuration only if it has been canged */

		if (twl6040->sysclk != freq_out) {

			switch (freq_out) {

			case 17640000:

				lppllctl |= TWL6040_LPLLFIN;
@@ -336,11 +346,18 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, 
				break;

			default:

				dev_err(twl6040->dev,

				"freq_out %d not supported\n", freq_out);

					"freq_out %d not supported\n",

					freq_out);

				ret = -EINVAL;

				goto pll_out;

			}

		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,

					  lppllctl);

		}



		/* The PLL in use has not been change, we can exit */

		if (twl6040->pll == pll_id)

			break;



		switch (freq_in) {

		case 32768:
@@ -371,6 +388,7 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, 
			goto pll_out;

		}



		if (twl6040->mclk != freq_in) {

			hppllctl &= ~TWL6040_MCLK_MSK;



			switch (freq_in) {
@@ -404,15 +422,22 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, 
				goto pll_out;

			}



		/* enable clock slicer to ensure input waveform is square */

			/*

			 * enable clock slicer to ensure input waveform is

			 * square

			 */

			hppllctl |= TWL6040_HPLLSQRENA;



		twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl);

			twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,

					  hppllctl);

			usleep_range(500, 700);

			lppllctl |= TWL6040_HPLLSEL;

		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,

					  lppllctl);

			lppllctl &= ~TWL6040_LPLLENA;

		twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);

			twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,

					  lppllctl);

		}

		break;

	default:

		dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
@@ -421,6 +446,7 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, 
	}



	twl6040->sysclk = freq_out;

	twl6040->mclk = freq_in;

	twl6040->pll = pll_id;



pll_out:

include/linux/mfd/twl6040.h

+2 −0
Original line number Diff line number Diff line
@@ -187,8 +187,10 @@ struct twl6040 { 
	int rev;

	u8 vibra_ctrl_cache[2];



	/* PLL configuration */

	int pll;

	unsigned int sysclk;

	unsigned int mclk;



	unsigned int irq;

	unsigned int irq_base;