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[media] media: st-rc: Add reset support 

Some of the SOCs hold the IRB IP in softreset state by default.
For this IP to work driver needs to bring it out of softreset.
This patch adds support to reset the IP via reset framework.

Without this patch the driver can not work with SoCs which holds the IP
in softreset.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Srinivas Kandagatla 2014-01-14 08:04:21 -03:00 committed by Mauro Carvalho Chehab
parent 1045d81d30
commit 1d504b649f
1 changed files with 13 additions and 0 deletions
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13
drivers/media/rc/st_rc.c
View File

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <media/rc-core.h>
#include <linux/pinctrl/consumer.h>
@ -28,6 +29,7 @@ struct st_rc_device {
int sample_mult;
int sample_div;
bool rxuhfmode;
struct reset_control *rstc;
};
/* Registers */
@ -161,6 +163,10 @@ static void st_rc_hardware_init(struct st_rc_device *dev)
unsigned int rx_max_symbol_per = MAX_SYMB_TIME;
unsigned int rx_sampling_freq_div;
/* Enable the IP */
if (dev->rstc)
reset_control_deassert(dev->rstc);
clk_prepare_enable(dev->sys_clock);
baseclock = clk_get_rate(dev->sys_clock);
@ -271,6 +277,11 @@ static int st_rc_probe(struct platform_device *pdev)
else
rc_dev->rx_base = rc_dev->base;
rc_dev->rstc = reset_control_get(dev, NULL);
if (IS_ERR(rc_dev->rstc))
rc_dev->rstc = NULL;
rc_dev->dev = dev;
platform_set_drvdata(pdev, rc_dev);
st_rc_hardware_init(rc_dev);
@ -338,6 +349,8 @@ static int st_rc_suspend(struct device *dev)
writel(0x00, rc_dev->rx_base + IRB_RX_EN);
writel(0x00, rc_dev->rx_base + IRB_RX_INT_EN);
clk_disable_unprepare(rc_dev->sys_clock);
if (rc_dev->rstc)
reset_control_assert(rc_dev->rstc);
}
return 0;