From: Fabrice Gasnier <fabrice.gasnier@st.com>
To: <jic23@kernel.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <mcoquelin.stm32@gmail.com>,
<alexandre.torgue@st.com>, <fabrice.gasnier@st.com>,
<linux-iio@vger.kernel.org>, <lars@metafoo.de>, <knaack.h@gmx.de>,
<pmeerw@pmeerw.net>, <linux-stm32@st-md-mailman.stormreply.com>,
<arnaud.pouliquen@st.com>, <olivier.moysan@st.com>
Subject: [PATCH 2/8] iio: adc: stm32-dfsdm: continuous mode depends on current mode
Date: Wed, 6 Mar 2019 09:55:18 +0100 [thread overview]
Message-ID: <1551862524-25098-3-git-send-email-fabrice.gasnier@st.com> (raw)
In-Reply-To: <1551862524-25098-1-git-send-email-fabrice.gasnier@st.com>
DFSDM regular continuous mode usage depends on current mode (not DMA):
- for single conversion, RCONT doesn't need to be set.
- for buffer mode, RCONT has to be set (e.g. INDIO_BUFFER_SOFTWARE
used by audio currently).
This is related to filter configuration, move it to relevant routine.
This is precursor patch to ease support of triggered buffer mode.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/iio/adc/stm32-dfsdm-adc.c | 54 +++++++++++++++++++--------------------
1 file changed, 27 insertions(+), 27 deletions(-)
diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index fcd4a1c..8690672 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -38,6 +38,10 @@
#define DFSDM_MAX_RES BIT(31)
#define DFSDM_DATA_RES BIT(23)
+/* Filter configuration */
+#define DFSDM_CR1_CFG_MASK (DFSDM_CR1_RCH_MASK | DFSDM_CR1_RCONT_MASK | \
+ DFSDM_CR1_RSYNC_MASK)
+
enum sd_converter_type {
DFSDM_AUDIO,
DFSDM_IIO,
@@ -262,11 +266,13 @@ static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm,
DFSDM_CR1_DFEN_MASK, DFSDM_CR1_DFEN(0));
}
-static int stm32_dfsdm_filter_configure(struct stm32_dfsdm *dfsdm,
+static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc,
unsigned int fl_id, unsigned int ch_id)
{
- struct regmap *regmap = dfsdm->regmap;
- struct stm32_dfsdm_filter *fl = &dfsdm->fl_list[fl_id];
+ struct iio_dev *indio_dev = iio_priv_to_dev(adc);
+ struct regmap *regmap = adc->dfsdm->regmap;
+ struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id];
+ u32 cr1;
int ret;
/* Average integrator oversampling */
@@ -287,14 +293,16 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm *dfsdm,
return ret;
/* No scan mode supported for the moment */
- ret = regmap_update_bits(regmap, DFSDM_CR1(fl_id), DFSDM_CR1_RCH_MASK,
- DFSDM_CR1_RCH(ch_id));
- if (ret)
- return ret;
+ cr1 = DFSDM_CR1_RCH(ch_id);
+
+ /* Continuous conversions triggered by SPI clock in buffer mode */
+ if (indio_dev->currentmode & INDIO_BUFFER_SOFTWARE)
+ cr1 |= DFSDM_CR1_RCONT(1);
- return regmap_update_bits(regmap, DFSDM_CR1(fl_id),
- DFSDM_CR1_RSYNC_MASK,
- DFSDM_CR1_RSYNC(fl->sync_mode));
+ cr1 |= DFSDM_CR1_RSYNC(fl->sync_mode);
+
+ return regmap_update_bits(regmap, DFSDM_CR1(fl_id), DFSDM_CR1_CFG_MASK,
+ cr1);
}
static int stm32_dfsdm_channel_parse_of(struct stm32_dfsdm *dfsdm,
@@ -426,47 +434,39 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc,
{
struct regmap *regmap = adc->dfsdm->regmap;
int ret;
- unsigned int dma_en = 0, cont_en = 0;
+ unsigned int dma_en = 0;
ret = stm32_dfsdm_start_channel(adc->dfsdm, chan->channel);
if (ret < 0)
return ret;
- ret = stm32_dfsdm_filter_configure(adc->dfsdm, adc->fl_id,
- chan->channel);
+ ret = stm32_dfsdm_filter_configure(adc, adc->fl_id, chan->channel);
if (ret < 0)
goto stop_channels;
if (dma) {
/* Enable DMA transfer*/
dma_en = DFSDM_CR1_RDMAEN(1);
- /* Enable conversion triggered by SPI clock*/
- cont_en = DFSDM_CR1_RCONT(1);
}
/* Enable DMA transfer*/
ret = regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
DFSDM_CR1_RDMAEN_MASK, dma_en);
if (ret < 0)
- goto stop_channels;
-
- /* Enable conversion triggered by SPI clock*/
- ret = regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
- DFSDM_CR1_RCONT_MASK, cont_en);
- if (ret < 0)
- goto stop_channels;
+ goto filter_unconfigure;
ret = stm32_dfsdm_start_filter(adc->dfsdm, adc->fl_id);
if (ret < 0)
- goto stop_channels;
+ goto stop_dma;
return 0;
-stop_channels:
+stop_dma:
regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
DFSDM_CR1_RDMAEN_MASK, 0);
-
+filter_unconfigure:
regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
- DFSDM_CR1_RCONT_MASK, 0);
+ DFSDM_CR1_CFG_MASK, 0);
+stop_channels:
stm32_dfsdm_stop_channel(adc->dfsdm, chan->channel);
return ret;
@@ -484,7 +484,7 @@ static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc,
DFSDM_CR1_RDMAEN_MASK, 0);
regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
- DFSDM_CR1_RCONT_MASK, 0);
+ DFSDM_CR1_CFG_MASK, 0);
stm32_dfsdm_stop_channel(adc->dfsdm, chan->channel);
}
--
2.7.4
next prev parent reply other threads:[~2019-03-06 8:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 8:55 [PATCH 0/8] iio: adc: stm32-dfsdm: add buffer modes Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 1/8] iio: adc: stm32-dfsdm: make spi_master_freq more accurate Fabrice Gasnier
2019-03-10 10:09 ` Jonathan Cameron
2019-03-21 13:41 ` Fabrice Gasnier
2019-03-06 8:55 ` Fabrice Gasnier [this message]
2019-03-06 8:55 ` [PATCH 3/8] iio: adc: stm32-dfsdm: move dma enable from start_conv() to start_dma() Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 4/8] iio: adc: stm32-dfsdm: move dma slave config to start routine Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 5/8] iio: adc: stm32-dfsdm: enable hw consumer Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 6/8] iio: adc: stm32-dfsdm: add support for scan mode Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 7/8] iio: adc: stm32-dfsdm: add support for buffer modes Fabrice Gasnier
2019-03-10 10:21 ` Jonathan Cameron
2019-03-15 18:01 ` Fabrice Gasnier
2019-03-16 14:10 ` Jonathan Cameron
2019-03-21 13:41 ` Fabrice Gasnier
2019-03-06 8:55 ` [PATCH 8/8] iio: adc: stm32-dfsdm: claim direct mode for raw read and settings Fabrice Gasnier
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