diff mbox series

[v2,1/2] clk: qcom: clk-rcg2: Update logic to calculate D value for RCG

Message ID 20220202172540.2458-1-tdas@codeaurora.org
State New
Headers show
Series [v2,1/2] clk: qcom: clk-rcg2: Update logic to calculate D value for RCG | expand

Commit Message

Taniya Das Feb. 2, 2022, 5:25 p.m. UTC 
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.

Fixes: 99cbd064b059f ("clk: qcom: Support display RCG clocks")
Signed-off-by: Taniya Das <tdas@codeaurora.org>
---
* Split the patch and update the Fixes tag.

 drivers/clk/qcom/clk-rcg2.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member
of the Code Aurora Forum, hosted by the  Linux Foundation.

Comments

Stephen Boyd Feb. 17, 2022, 11:06 p.m. UTC | #1 
Quoting Taniya Das (2022-02-02 09:25:40)
> Support the new numerator and denominator for pixel clock.
> 
> Fixes: 99cbd064b059f ("clk: qcom: Support display RCG clocks")
> Signed-off-by: Taniya Das <tdas@codeaurora.org>

I guess the previous patch is to make this patch work? Please mention
that in the first patches commit text.

> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>
diff mbox series

Patch

diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index e1b1b426fae4..34251ec98def 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -264,7 +264,7 @@  static int clk_rcg2_determine_floor_rate(struct clk_hw *hw,

 static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
 {
-	u32 cfg, mask;
+	u32 cfg, mask, d_val, not2d_val;
 	struct clk_hw *hw = &rcg->clkr.hw;
 	int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);

@@ -283,8 +283,18 @@  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;
+
+		if (d_val > ((f->n - f->m) * 2))
+			d_val = (f->n - f->m) * 2;
+		else if (d_val < f->m)
+			d_val = f->m;
+
+		not2d_val = ~d_val & mask;
+
 		ret = regmap_update_bits(rcg->clkr.regmap,
-				RCG_D_OFFSET(rcg), mask, ~f->n);
+				RCG_D_OFFSET(rcg), mask, not2d_val);
 		if (ret)
 			return ret;
 	}