AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

spi/bcm63xx-hsspi: keep pll clk enabled

Browse Source 
If the pll clock needs to be enabled to get its rate, it will also need
to be enabled to provide it. So ensure it is kept enabled through the
lifetime of the device.

Fixes: 0d7412ed1f ("spi/bcm63xx-hspi: Enable the clock before calling clk_get_rate().")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jonas Gorski 2018-08-28 13:44:11 +02:00 committed by Mark Brown
parent 8089babee1
commit 0fd85869c2
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/spi/spi-bcm63xx-hsspi.c
View File

@ -101,6 +101,7 @@ struct bcm63xx_hsspi {
struct platform_device *pdev;
struct clk *clk;
struct clk *pll_clk;
void __iomem *regs;
u8 __iomem *fifo;
@ -332,7 +333,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
struct resource *res_mem;
void __iomem *regs;
struct device *dev = &pdev->dev;
struct clk *clk;
struct clk *clk, *pll_clk = NULL;
int irq, ret;
u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
@ -358,7 +359,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
rate = clk_get_rate(clk);
if (!rate) {
struct clk *pll_clk = devm_clk_get(dev, "pll");
pll_clk = devm_clk_get(dev, "pll");
if (IS_ERR(pll_clk)) {
ret = PTR_ERR(pll_clk);
@ -373,19 +374,20 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
clk_disable_unprepare(pll_clk);
if (!rate) {
ret = -EINVAL;
goto out_disable_clk;
goto out_disable_pll_clk;
}
}
master = spi_alloc_master(&pdev->dev, sizeof(*bs));
if (!master) {
ret = -ENOMEM;
goto out_disable_clk;
goto out_disable_pll_clk;
}
bs = spi_master_get_devdata(master);
bs->pdev = pdev;
bs->clk = clk;
bs->pll_clk = pll_clk;
bs->regs = regs;
bs->speed_hz = rate;
bs->fifo = (u8 __iomem *)(bs->regs + HSSPI_FIFO_REG(0));
@ -440,6 +442,8 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
out_put_master:
spi_master_put(master);
out_disable_pll_clk:
clk_disable_unprepare(pll_clk);
out_disable_clk:
clk_disable_unprepare(clk);
return ret;
@ -453,6 +457,7 @@ static int bcm63xx_hsspi_remove(struct platform_device *pdev)
/* reset the hardware and block queue progress */
__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
clk_disable_unprepare(bs->pll_clk);
clk_disable_unprepare(bs->clk);
return 0;
@ -465,6 +470,7 @@ static int bcm63xx_hsspi_suspend(struct device *dev)
struct bcm63xx_hsspi *bs = spi_master_get_devdata(master);
spi_master_suspend(master);
clk_disable_unprepare(bs->pll_clk);
clk_disable_unprepare(bs->clk);
return 0;
@ -480,6 +486,12 @@ static int bcm63xx_hsspi_resume(struct device *dev)
if (ret)
return ret;
if (bs->pll_clk) {
ret = clk_prepare_enable(bs->pll_clk);
if (ret)
return ret;
}
spi_master_resume(master);
return 0;