On Sat, Nov 13, 2010 at 12:44:42AM +0100, Gregory CLEMENT wrote:
> When SPI wake up from OFF mode, CS is in the wrong state: force it
> to the inactive state.
>
> During the system life, I monitored the CS behavior using a oscilloscope.
> I also activated debug in omap2_mcspi, so I saw when driver disable
> the clocks and restore context when device is not used.
> Each time the CS was in the correct state.
> It was only when system was put suspend to ram with off-mode
> activated that on resume the CS was in wrong state( ie activated).
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Looks okay to me, but I'd like to get an ack from other users before I
merge it. Also some minor comments below.
> ---
> drivers/spi/omap2_mcspi.c | 35 +++++++++++++++++++++++++++++++++++
> 1 files changed, 35 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
> index 2a651e6..43d92fc 100644
> --- a/drivers/spi/omap2_mcspi.c
> +++ b/drivers/spi/omap2_mcspi.c
> @@ -1305,11 +1305,46 @@ static int __exit omap2_mcspi_remove(struct
> platform_device *pdev)
> /* work with hotplug and coldplug */
> MODULE_ALIAS("platform:omap2_mcspi");
> +#ifdef CONFIG_PM
> +/* When SPI wake up from off-mode, CS is in activate state. If it was in
> + * unactive state when driver was suspend, then force it to
> unactive state at
Patch is line-wrap damaged. Check your mailer configuration.
> + * wake up.
> + */
> +static int omap2_mcspi_resume(struct platform_device *pdev)
> +{
> + struct spi_master *master;
> + struct omap2_mcspi_cs *cs;
> + struct omap2_mcspi *mcspi;
> +
> + master = dev_get_drvdata(&pdev->dev);
> + mcspi = spi_master_get_devdata(master);
These 5 lines can be collapsed a bit:
struct spi_master *master = dev_get_drvdata(&pdev->dev);
struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
struct omap2_mcspi_cs *cs;
> + omap2_mcspi_enable_clocks(mcspi);
> + list_for_each_entry(cs, &omap2_mcspi_ctx[master->bus_num - 1].cs,
> + node) {
> + if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
> +
> + /* We need to togle CS state for OMAP take this
spelling. s/togle/toggle
> + * change in account.
> + */
> + MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 1);
> + __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
> + MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 0);
> + __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
> + }
> + }
> + omap2_mcspi_disable_clocks(mcspi);
> + return 0;
> +}
> +#else
> +#define omap2_mcspi_resume NULL
> +#endif
> +
> static struct platform_driver omap2_mcspi_driver = {
> .driver = {
> .name = "omap2_mcspi",
> .owner = THIS_MODULE,
> },
> + .resume = omap2_mcspi_resume,
> .remove = __exit_p(omap2_mcspi_remove),
> };
> -- 1.7.0.4
>
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