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media: atmel-isc: Add spin lock for clock enable ops 

Add the spin lock for the clock enable and disable operations.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Wenyou Yang 2017-10-10 04:46:36 +02:00 committed by Mauro Carvalho Chehab
parent cd1a77e3c9
commit cab1dea3be
1 changed files with 14 additions and 1 deletions
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15
drivers/media/platform/atmel/atmel-isc.c
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@ -65,6 +65,7 @@ struct isc_clk {
struct clk_hw hw;
struct clk *clk;
struct regmap *regmap;
spinlock_t lock;
u8 id;
u8 parent_id;
u32 div;
@ -312,26 +313,37 @@ static int isc_clk_enable(struct clk_hw *hw)
struct isc_clk *isc_clk = to_isc_clk(hw);
u32 id = isc_clk->id;
struct regmap *regmap = isc_clk->regmap;
unsigned long flags;
unsigned int status;
dev_dbg(isc_clk->dev, "ISC CLK: %s, div = %d, parent id = %d\n",
__func__, isc_clk->div, isc_clk->parent_id);
spin_lock_irqsave(&isc_clk->lock, flags);
regmap_update_bits(regmap, ISC_CLKCFG,
ISC_CLKCFG_DIV_MASK(id) | ISC_CLKCFG_SEL_MASK(id),
(isc_clk->div << ISC_CLKCFG_DIV_SHIFT(id)) |
(isc_clk->parent_id << ISC_CLKCFG_SEL_SHIFT(id)));
regmap_write(regmap, ISC_CLKEN, ISC_CLK(id));
spin_unlock_irqrestore(&isc_clk->lock, flags);
return 0;
regmap_read(regmap, ISC_CLKSR, &status);
if (status & ISC_CLK(id))
return 0;
else
return -EINVAL;
}
static void isc_clk_disable(struct clk_hw *hw)
{
struct isc_clk *isc_clk = to_isc_clk(hw);
u32 id = isc_clk->id;
unsigned long flags;
spin_lock_irqsave(&isc_clk->lock, flags);
regmap_write(isc_clk->regmap, ISC_CLKDIS, ISC_CLK(id));
spin_unlock_irqrestore(&isc_clk->lock, flags);
}
static int isc_clk_is_enabled(struct clk_hw *hw)
@ -492,6 +504,7 @@ static int isc_clk_register(struct isc_device *isc, unsigned int id)
isc_clk->regmap = regmap;
isc_clk->id = id;
isc_clk->dev = isc->dev;
spin_lock_init(&isc_clk->lock);
isc_clk->clk = clk_register(isc->dev, &isc_clk->hw);
if (IS_ERR(isc_clk->clk)) {