soc: xilinx: vcu: remove calculation of PLL configuration

As the consumers are now responsible for setting the clock rate via
clock framework, the clock rate is now calculated using round_rate and
the driver does not need to calculate the clock rate beforehand.

Remove the code that calculates the PLL configuration.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/20210121071659.1226489-12-m.tretter@pengutronix.de
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: tretter

drivers/soc/xilinx/xlnx_vcu.c

@@ -59,10 +59,6 @@
 #define MHZ				1000000
 #define FVCO_MIN			(1500U * MHZ)
 #define FVCO_MAX			(3000U * MHZ)
-#define DIVISOR_MIN			0
-#define DIVISOR_MAX			63
-#define FRAC				100
-#define LIMIT				(10 * MHZ)
 
 /**
  * struct xvcu_device - Xilinx VCU init device structure
@@ -482,111 +478,6 @@ static struct clk_hw *xvcu_register_pll(struct device *dev,
 	return hw;
 }
 
-/**
- * xvcu_set_vcu_pll_info - Set the VCU PLL info
- * @xvcu:	Pointer to the xvcu_device structure
- *
- * Programming the VCU PLL based on the user configuration
- * (ref clock freq, core clock freq, mcu clock freq).
- * Core clock frequency has higher priority than mcu clock frequency
- * Errors in following cases
- *    - When mcu or clock clock get from logicoreIP is 0
- *    - When VCU PLL DIV related bits value other than 1
- *    - When proper data not found for given data
- *    - When sis570_1 clocksource related operation failed
- *
- * Return:	Returns status, either success or error+reason
- */
-static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu)
-{
-	u32 refclk, coreclk, mcuclk, inte, deci;
-	u32 divisor_mcu, divisor_core, fvco;
-	u32 pll_clk;
-	u32 mod;
-	int i;
-	const struct xvcu_pll_cfg *found = NULL;
-
-	regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK, &inte);
-	regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK_DEC, &deci);
-	regmap_read(xvcu->logicore_reg_ba, VCU_CORE_CLK, &coreclk);
-	coreclk *= MHZ;
-	regmap_read(xvcu->logicore_reg_ba, VCU_MCU_CLK, &mcuclk);
-	mcuclk *= MHZ;
-	if (!mcuclk || !coreclk) {
-		dev_err(xvcu->dev, "Invalid mcu and core clock data\n");
-		return -EINVAL;
-	}
-
-	refclk = (inte * MHZ) + (deci * (MHZ / FRAC));
-	dev_dbg(xvcu->dev, "Ref clock from logicoreIP is %uHz\n", refclk);
-	dev_dbg(xvcu->dev, "Core clock from logicoreIP is %uHz\n", coreclk);
-	dev_dbg(xvcu->dev, "Mcu clock from logicoreIP is %uHz\n", mcuclk);
-
-	for (i = ARRAY_SIZE(xvcu_pll_cfg) - 1; i >= 0; i--) {
-		const struct xvcu_pll_cfg *cfg = &xvcu_pll_cfg[i];
-
-		fvco = cfg->fbdiv * refclk;
-		if (fvco >= FVCO_MIN && fvco <= FVCO_MAX) {
-			pll_clk = fvco / VCU_PLL_DIV2;
-			if (fvco % VCU_PLL_DIV2 != 0)
-				pll_clk++;
-			mod = pll_clk % coreclk;
-			if (mod < LIMIT) {
-				divisor_core = pll_clk / coreclk;
-			} else if (coreclk - mod < LIMIT) {
-				divisor_core = pll_clk / coreclk;
-				divisor_core++;
-			} else {
-				continue;
-			}
-			if (divisor_core >= DIVISOR_MIN &&
-			    divisor_core <= DIVISOR_MAX) {
-				found = cfg;
-				divisor_mcu = pll_clk / mcuclk;
-				mod = pll_clk % mcuclk;
-				if (mcuclk - mod < LIMIT)
-					divisor_mcu++;
-				break;
-			}
-		}
-	}
-
-	if (!found) {
-		dev_err(xvcu->dev, "Invalid clock combination.\n");
-		return -EINVAL;
-	}
-
-	coreclk = pll_clk / divisor_core;
-	mcuclk = pll_clk / divisor_mcu;
-	dev_dbg(xvcu->dev, "Actual Ref clock freq is %uHz\n", refclk);
-	dev_dbg(xvcu->dev, "Actual Core clock freq is %uHz\n", coreclk);
-	dev_dbg(xvcu->dev, "Actual Mcu clock freq is %uHz\n", mcuclk);
-
-	return 0;
-}
-
-/**
- * xvcu_set_pll - PLL init sequence
- * @xvcu:	Pointer to the xvcu_device structure
- *
- * Call the api to set the PLL info and once that is done then
- * init the PLL sequence to make the PLL stable.
- *
- * Return:	Returns status, either success or error+reason
- */
-static int xvcu_set_pll(struct xvcu_device *xvcu)
-{
-	int ret;
-
-	ret = xvcu_set_vcu_pll_info(xvcu);
-	if (ret) {
-		dev_err(xvcu->dev, "failed to set pll info\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static struct clk_hw *xvcu_clk_hw_register_leaf(struct device *dev,
 						const char *name,
 						const struct clk_parent_data *parent_data,
@@ -834,13 +725,6 @@ static int xvcu_probe(struct platform_device *pdev)
 	 */
 	regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, VCU_GASKET_VALUE);
 
-	/* Do the PLL Settings based on the ref clk,core and mcu clk freq */
-	ret = xvcu_set_pll(xvcu);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to set the pll\n");
-		goto error_pll_ref;
-	}
-
 	ret = xvcu_register_clock_provider(xvcu);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register clock provider\n");
@@ -853,7 +737,6 @@ static int xvcu_probe(struct platform_device *pdev)
 
 error_clk_provider:
 	xvcu_unregister_clock_provider(xvcu);
-error_pll_ref:
 	clk_disable_unprepare(xvcu->aclk);
 	return ret;
 }