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Commit e9ba570d authored by Jagadeesh Kona's avatar Jagadeesh Kona Committed by Jagadeesh Kona
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clk: qcom: clk-rcg2: Update logic to calculate D value for RCG 



The current implementation does not check for D value is within
the accepted range for a given M & N value. Update the logic to
calculate the final D value based on the range. While at it, add
support for 2/3 divider in frac_table_pixel.

Change-Id: Ia42b9197de6d594129b1a48106f8e5a2be70a1c6
Signed-off-by: default avatarTaniya Das <tdas@codeaurora.org>
Signed-off-by: default avatarJagadeesh Kona <jkona@codeaurora.org>
parent a4341e9d

drivers/clk/qcom/clk-rcg2.c

+12 −2
Original line number Diff line number Diff line
@@ -506,7 +506,7 @@ static bool clk_rcg2_current_config(struct clk_rcg2 *rcg, 


static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)

{

	u32 cfg, mask;

	u32 cfg, mask, d_val, not2d_val, n_minus_m;

	struct clk_hw *hw = &rcg->clkr.hw;

	int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
@@ -525,8 +525,17 @@ static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) 
		if (ret)

			return ret;



		/* Calculate 2d value */

		d_val = f->n;



		n_minus_m = f->n - f->m;

		n_minus_m *= 2;



		d_val = clamp_t(u32, d_val, f->m, n_minus_m);

		not2d_val = ~d_val & mask;



		ret = regmap_update_bits(rcg->clkr.regmap,

				rcg->cmd_rcgr + D_REG, mask, ~f->n);

				rcg->cmd_rcgr + D_REG, mask, not2d_val);

		if (ret)

			return ret;

	}
@@ -1102,6 +1111,7 @@ static const struct frac_entry frac_table_pixel[] = { 
	{ 2, 9 },

	{ 4, 9 },

	{ 1, 1 },

	{ 2, 3 },

	{ }

};