staging: sm750fb: merge calcPLL and getPllValue into getChipClock

The getChipClock function is used only to get MXCLK frequency, which
makes most of getPllValue function unused and thus. The detection of
MXCLK frequency may be implemented directly in getChipClock rendering
getPllValue and calcPLL unused.
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_chip.c

@@ -34,54 +34,21 @@ logical_chip_type_t getChipType(void)
 	return chip;
 }
 
-static inline unsigned int calcPLL(pll_value_t *pPLL)
-{
-	return (pPLL->inputFreq * pPLL->M / pPLL->N / (1 << pPLL->OD) /
-		(1 << pPLL->POD));
-}
-
-static unsigned int getPllValue(clock_type_t clockType, pll_value_t *pPLL)
-{
-	unsigned int ulPllReg = 0;
-
-	pPLL->inputFreq = DEFAULT_INPUT_CLOCK;
-	pPLL->clockType = clockType;
-
-	switch (clockType) {
-	case MXCLK_PLL:
-		ulPllReg = PEEK32(MXCLK_PLL_CTRL);
-		break;
-	case PRIMARY_PLL:
-		ulPllReg = PEEK32(PANEL_PLL_CTRL);
-		break;
-	case SECONDARY_PLL:
-		ulPllReg = PEEK32(CRT_PLL_CTRL);
-		break;
-	case VGA0_PLL:
-		ulPllReg = PEEK32(VGA_PLL0_CTRL);
-		break;
-	case VGA1_PLL:
-		ulPllReg = PEEK32(VGA_PLL1_CTRL);
-		break;
-	}
-
-	pPLL->M = FIELD_GET(ulPllReg, PANEL_PLL_CTRL, M);
-	pPLL->N = FIELD_GET(ulPllReg, PANEL_PLL_CTRL, N);
-	pPLL->OD = FIELD_GET(ulPllReg, PANEL_PLL_CTRL, OD);
-	pPLL->POD = FIELD_GET(ulPllReg, PANEL_PLL_CTRL, POD);
-
-	return calcPLL(pPLL);
-}
-
 static unsigned int getChipClock(void)
 {
-	pll_value_t pll;
-#if 1
+	unsigned int pll_reg;
+	unsigned int M, N, OD, POD;
+
 	if (getChipType() == SM750LE)
 		return MHz(130);
-#endif
 
-	return getPllValue(MXCLK_PLL, &pll);
+	pll_reg = PEEK32(MXCLK_PLL_CTRL);
+	M = FIELD_GET(pll_reg, PANEL_PLL_CTRL, M);
+	N = FIELD_GET(pll_reg, PANEL_PLL_CTRL, N);
+	OD = FIELD_GET(pll_reg, PANEL_PLL_CTRL, OD);
+	POD = FIELD_GET(pll_reg, PANEL_PLL_CTRL, POD);
+
+	return DEFAULT_INPUT_CLOCK * M / N / (1 << OD) / (1 << POD);
 }
 
 /*