On Sat, Jan 03, 2015 at 12:46:32PM +0100, Pavel Machek wrote:
> For omap3, proper implementation of eocz bit is needed. It was
> actually a TODO in the driver.
>
> When periodic mode is not enabled, it is neccessary to force reads.
>
> Signed-off-by: Pavel Machek <pa...@ucw.cz>
>
> diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> index 634b6ce..ee63d08 100644
> --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
> @@ -43,6 +43,8 @@
>
> #include "ti-bandgap.h"
>
> +static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id);
> +
> /*** Helper functions to access registers and their bitfields ***/
>
> /**
> @@ -852,14 +831,20 @@ int ti_bandgap_read_temperature(struct ti_bandgap *bgp,
> int id,
> if (ret)
> return ret;
>
> + if (!TI_BANDGAP_HAS(bgp, MODE_CONFIG)) {
> + ret = ti_bandgap_force_single_read(bgp, id);
not sure MODE_CONFIG is sufficient condition for single read on all OMAP
versions.
> + if (ret)
> + return ret;
> + }
> +
> spin_lock(&bgp->lock);
> temp = ti_bandgap_read_temp(bgp, id);
> spin_unlock(&bgp->lock);
>
> - ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
> + ret = ti_bandgap_adc_to_mcelsius(bgp, temp, &temp);
this one should be part of your clean up patch
> if (ret)
> return -EIO;
>
> *temperature = temp;
>
> return 0;
> @@ -917,7 +903,8 @@ void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp,
> int id)
> static int
> ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
> {
> - u32 temp = 0, counter = 1000;
> + u32 counter = 1000;
> + struct temp_sensor_registers *tsr;
>
> /* Select single conversion mode */
> if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
> @@ -925,16 +912,27 @@ ti_bandgap_force_single_read(struct ti_bandgap *bgp,
> int id)
>
> /* Start of Conversion = 1 */
> RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1);
> - /* Wait until DTEMP is updated */
> - temp = ti_bandgap_read_temp(bgp, id);
>
> - while ((temp == 0) && --counter)
> - temp = ti_bandgap_read_temp(bgp, id);
> - /* REVISIT: Check correct condition for end of conversion */
> + /* Wait for EOCZ going up */
> + tsr = bgp->conf->sensors[id].registers;
> +
> + while (--counter) {
> + if (ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
> + tsr->bgap_eocz_mask)
> + break;
> + }
>
> /* Start of Conversion = 0 */
> RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0);
>
> + /* Wait for EOCZ going down */
> + counter = 1000;
> + while (--counter) {
> + if (!(ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
> + tsr->bgap_eocz_mask))
> + break;
> + }
> +
> return 0;
> }
>
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures)
> http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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