[PATCH v5 08/11] clk: mediatek: fix pll setting

Mars Cheng
2018-07-17T08:52:29Z

From: Owen Chen <owen.chen@mediatek.com>

1. pcwibits: The integer bits of pcw for plls is extend to 8 bits,
add a variable to indicate this change and
backward-compatible.
2. fmin: The pll freqency lower-bound is vary from 1GMhz to
1.5Ghz, add a variable to indicate platform-dependent.

Signed-off-by: Owen Chen <owen.chen@mediatek.com>
---
drivers/clk/mediatek/clk-mtk.h | 2 ++
drivers/clk/mediatek/clk-pll.c | 45 ++++++++++++++++++++++++++++++++++------
2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
index f83c2bb..1882221 100644
--- a/drivers/clk/mediatek/clk-mtk.h
+++ b/drivers/clk/mediatek/clk-mtk.h
@@ -215,7 +215,9 @@ struct mtk_pll_data {
const struct clk_ops *ops;
u32 rst_bar_mask;
unsigned long fmax;
+ unsigned long fmin;
int pcwbits;
+ int pcwibits;
uint32_t pcw_reg;
int pcw_shift;
const struct mtk_pll_div_table *div_table;
diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index f54e401..df571e5 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -27,7 +27,7 @@
#define CON0_BASE_EN BIT(0)
#define CON0_PWR_ON BIT(0)
#define CON0_ISO_EN BIT(1)
-#define CON0_PCW_CHG BIT(31)
+#define CON1_PCW_CHG BIT(31)

#define AUDPLL_TUNER_EN BIT(31)

@@ -69,11 +69,13 @@ static unsigned long __mtk_pll_recalc_rate(struct mtk_clk_pll *pll, u32 fin,
{
int pcwbits = pll->data->pcwbits;
int pcwfbits;
+ int ibits;
u64 vco;
u8 c = 0;

/* The fractional part of the PLL divider. */
- pcwfbits = pcwbits > INTEGER_BITS ? pcwbits - INTEGER_BITS : 0;
+ ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+ pcwfbits = pcwbits > ibits ? pcwbits - ibits : 0;

vco = (u64)fin * pcw;

@@ -93,9 +95,31 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
{
u32 con1, val;
int pll_en;
+ u32 tuner_en = 0;
+ u32 tuner_en_mask;
+ void __iomem *tuner_en_addr = NULL;

pll_en = readl(pll->base_addr + REG_CON0) & CON0_BASE_EN;

+ /* disable tuner */
+ if (pll->tuner_en_addr) {
+ tuner_en_addr = pll->tuner_en_addr;
+ tuner_en_mask = BIT(pll->data->tuner_en_bit);
+ } else if (pll->tuner_addr) {
+ tuner_en_addr = pll->tuner_addr;
+ tuner_en_mask = AUDPLL_TUNER_EN;
+ }
+
+ if (tuner_en_addr) {
+ val = readl(tuner_en_addr);
+ tuner_en = val & tuner_en_mask;
+
+ if (tuner_en) {
+ val &= ~tuner_en_mask;
+ writel(val, tuner_en_addr);
+ }
+ }
+
/* set postdiv */
val = readl(pll->pd_addr);
val &= ~(POSTDIV_MASK << pll->data->pd_shift);
@@ -116,12 +140,20 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
con1 = readl(pll->base_addr + REG_CON1);

if (pll_en)
- con1 |= CON0_PCW_CHG;
+ con1 |= CON1_PCW_CHG;

writel(con1, pll->base_addr + REG_CON1);
+
if (pll->tuner_addr)
writel(con1 + 1, pll->tuner_addr);

+ /* restore tuner_en */
+ if (tuner_en_addr && tuner_en) {
+ val = readl(tuner_en_addr);
+ val |= tuner_en_mask;
+ writel(val, tuner_en_addr);
+ }
+
if (pll_en)
udelay(20);
}
@@ -138,9 +170,10 @@ static void mtk_pll_set_rate_regs(struct mtk_clk_pll *pll, u32 pcw,
static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
u32 freq, u32 fin)
{
- unsigned long fmin = 1000 * MHZ;
+ unsigned long fmin = pll->data->fmin ? pll->data->fmin : 1000 * MHZ;
const struct mtk_pll_div_table *div_table = pll->data->div_table;
u64 _pcw;
+ int ibits;
u32 val;

if (freq > pll->data->fmax)
@@ -164,7 +197,8 @@ static void mtk_pll_calc_values(struct mtk_clk_pll *pll, u32 *pcw, u32 *postdiv,
}

/* _pcw = freq * postdiv / fin * 2^pcwfbits */
- _pcw = ((u64)freq << val) << (pll->data->pcwbits - INTEGER_BITS);
+ ibits = pll->data->pcwibits ? pll->data->pcwibits : INTEGER_BITS;
+ _pcw = ((u64)freq << val) << (pll->data->pcwbits - ibits);
do_div(_pcw, fin);

*pcw = (u32)_pcw;
@@ -192,7 +226,6 @@ static unsigned long mtk_pll_recalc_rate(struct clk_hw *hw,

postdiv = (readl(pll->pd_addr) >> pll->data->pd_shift) & POSTDIV_MASK;
postdiv = 1 << postdiv;
-
pcw = readl(pll->pcw_addr) >> pll->data->pcw_shift;
pcw &= GENMASK(pll->data->pcwbits - 1, 0);

--
1.7.9.5