From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from arroyo.ext.ti.com ([192.94.94.40]:33444 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965645AbaH1JIT (ORCPT ); Thu, 28 Aug 2014 05:08:19 -0400 From: Vignesh R To: Samuel Ortiz , Lee Jones , Sebastian Andrzej Siewior , Jonathan Cameron CC: , Felipe Balbi , , Vignesh R Subject: [PATCH] iio: adc: ti_am335x_adc: Fix TSC operation after ADC continouous mode Date: Thu, 28 Aug 2014 14:37:00 +0530 Message-ID: <1409216820-11506-1-git-send-email-vigneshr@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org After enabling and disabling ADC continuous mode via sysfs, ts_print_raw fails to return any data. This is because when ADC is configured for continuous mode, it disables touch screen steps.These steps are not re-enabled when ADC continuous mode is disabled. Therefore existing values of REG_SE needs to be cached before enabling continuous mode and disabling touch screen steps and enabling ADC steps. The cached value are to be restored to REG_SE once ADC is disabled. Fixes: 7ca6740cd1cd ("The continues-read mode remains unchanged") Signed-off-by: Vignesh R --- drivers/mfd/ti_am335x_tscadc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index d4e860413bb5..e3076afe6b3c 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -54,7 +54,7 @@ void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val) unsigned long flags; spin_lock_irqsave(&tsadc->reg_lock, flags); - tsadc->reg_se_cache = val; + tsadc->reg_se_cache |= val; if (tsadc->adc_waiting) wake_up(&tsadc->reg_se_wait); else if (!tsadc->adc_in_use) @@ -97,6 +97,7 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) { spin_lock_irq(&tsadc->reg_lock); + tsadc->reg_se_cache |= val; am335x_tscadc_need_adc(tsadc); tscadc_writel(tsadc, REG_SE, val); -- 1.7.9.5