Currently i2c register restore is done always. Adding conditional restore. The i2c register restore is done only if the context is lost. Also remove the definition of SYSS_RESETDONE_MASK and use the one in omap_hwmod.h. Cc: Kevin Hilman <khilman@xxxxxx> Cc: Ben Dooks <ben-linux@xxxxxxxxx> Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx> --- Previous discurssion http://lists.infradead.org/pipermail/linux-arm-kernel/2011-July/058747.html drivers/i2c/busses/i2c-omap.c | 36 +++++++++++++++++++++++------------- 1 files changed, 23 insertions(+), 13 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index f19bb7e..c07e3e4 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -43,6 +43,7 @@ #include <linux/slab.h> #include <linux/i2c-omap.h> #include <linux/pm_runtime.h> +#include <plat/omap_device.h> /* I2C controller revisions */ #define OMAP_I2C_OMAP1_REV_2 0x20 @@ -157,9 +158,6 @@ enum { #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */ #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ -/* OCP_SYSSTATUS bit definitions */ -#define SYSS_RESETDONE_MASK (1 << 0) - /* OCP_SYSCONFIG bit definitions */ #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) #define SYSC_SIDLEMODE_MASK (0x3 << 3) @@ -206,6 +204,7 @@ struct omap_i2c_dev { u16 syscstate; u16 westate; u16 errata; + int dev_lost_count; }; static const u8 reg_map_ip_v1[] = { @@ -1151,12 +1150,24 @@ omap_i2c_remove(struct platform_device *pdev) } #ifdef CONFIG_PM_RUNTIME +static void omap_i2c_restore(struct omap_i2c_dev *dev) +{ + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); + omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate); + omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate); + omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate); + omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, dev->bufstate); + omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate); + omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); +} static int omap_i2c_runtime_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); u16 iv; + _dev->dev_lost_count = omap_device_get_context_loss_count(pdev); + _dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG); if (_dev->dtrev == OMAP_I2C_IP_VERSION_2) omap_i2c_write_reg(_dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1); @@ -1180,16 +1191,15 @@ static int omap_i2c_runtime_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); - if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { - omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0); - omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate); - omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate); - omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate); - omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate); - omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate); - omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate); - omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); - } + int loss_cnt = omap_device_get_context_loss_count(pdev); + if (loss_cnt < 0) + return loss_cnt; + + if (_dev->dev_lost_count == loss_cnt && _dev->dev_lost_count) + return 0; + + if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) + omap_i2c_restore(_dev); /* * Don't write to this register if the IE state is 0 as it can -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
