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From: Alain Volmat <alain.volmat@st.com>
To: <broonie@kernel.org>, <amelie.delaunay@st.com>
Cc: <mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>,
	<linux-spi@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <fabrice.gasnier@st.com>,
	<alain.volmat@st.com>
Subject: [PATCH 5/5] spi: stm32: always perform registers configuration prior to transfer
Date: Fri, 7 Aug 2020 15:21:25 +0200	[thread overview]
Message-ID: <1596806485-3810-6-git-send-email-alain.volmat@st.com> (raw)
In-Reply-To: <1596806485-3810-1-git-send-email-alain.volmat@st.com>

SPI registers content may have been lost upon suspend/resume sequence.
So, always compute and apply the necessary configuration in
stm32_spi_transfer_one_setup routine.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
 drivers/spi/spi-stm32.c | 42 +++++++++++++++++-------------------------
 1 file changed, 17 insertions(+), 25 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index e196dbc5c432..7968d23347b6 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -1594,41 +1594,33 @@ static int stm32_spi_transfer_one_setup(struct stm32_spi *spi,
 	unsigned long flags;
 	unsigned int comm_type;
 	int nb_words, ret = 0;
+	int mbr;
 
 	spin_lock_irqsave(&spi->lock, flags);
 
 	spi->cur_xferlen = transfer->len;
 
-	if (spi->cur_bpw != transfer->bits_per_word) {
-		spi->cur_bpw = transfer->bits_per_word;
-		spi->cfg->set_bpw(spi);
-	}
-
-	if (spi->cur_speed != transfer->speed_hz) {
-		int mbr;
-
-		/* Update spi->cur_speed with real clock speed */
-		mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,
-					    spi->cfg->baud_rate_div_min,
-					    spi->cfg->baud_rate_div_max);
-		if (mbr < 0) {
-			ret = mbr;
-			goto out;
-		}
+	spi->cur_bpw = transfer->bits_per_word;
+	spi->cfg->set_bpw(spi);
 
-		transfer->speed_hz = spi->cur_speed;
-		stm32_spi_set_mbr(spi, mbr);
+	/* Update spi->cur_speed with real clock speed */
+	mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,
+				    spi->cfg->baud_rate_div_min,
+				    spi->cfg->baud_rate_div_max);
+	if (mbr < 0) {
+		ret = mbr;
+		goto out;
 	}
 
-	comm_type = stm32_spi_communication_type(spi_dev, transfer);
-	if (spi->cur_comm != comm_type) {
-		ret = spi->cfg->set_mode(spi, comm_type);
+	transfer->speed_hz = spi->cur_speed;
+	stm32_spi_set_mbr(spi, mbr);
 
-		if (ret < 0)
-			goto out;
+	comm_type = stm32_spi_communication_type(spi_dev, transfer);
+	ret = spi->cfg->set_mode(spi, comm_type);
+	if (ret < 0)
+		goto out;
 
-		spi->cur_comm = comm_type;
-	}
+	spi->cur_comm = comm_type;
 
 	if (spi->cfg->set_data_idleness)
 		spi->cfg->set_data_idleness(spi, transfer->len);
-- 
2.7.4


  parent reply	other threads:[~2020-08-07 13:23 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-07 13:21 [PATCH 0/5] spi: stm32: various driver fixes Alain Volmat
2020-08-07 13:21 ` [PATCH 1/5] spi: stm32h7: fix race condition at end of transfer Alain Volmat
2020-08-07 13:21 ` [PATCH 2/5] spi: stm32: fix fifo threshold level in case of short transfer Alain Volmat
2020-08-07 13:27   ` Mark Brown
2020-08-07 13:21 ` [PATCH 3/5] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate Alain Volmat
2020-08-07 13:21 ` [PATCH 4/5] spi: stm32: fixes suspend/resume management Alain Volmat
2020-08-07 13:21 ` Alain Volmat [this message]
2020-08-10 18:58 ` [PATCH 0/5] spi: stm32: various driver fixes Mark Brown

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