linux-kernel - Applied "spi: rockchip: simplify use

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Date:   Mon,  5 Nov 2018 12:06:25 +0000 (GMT)
From:   Mark Brown <broonie@...nel.org>
To:     Emil Renner Berthing <kernel@...il.dk>
Cc:     Heiko Stuebner <heiko@...ech.de>, Mark Brown <broonie@...nel.org>,
        linux-spi@...r.kernel.org, Addy Ke <addy.ke@...k-chips.com>,
        Mark Brown <broonie@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Applied "spi: rockchip: simplify use_dma logic" to the spi tree

The patch

   spi: rockchip: simplify use_dma logic

has been applied to the spi tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From eff0275e5253604429aedc42b008c5fcaa6cc597 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <kernel@...il.dk>
Date: Wed, 31 Oct 2018 11:57:06 +0100
Subject: [PATCH] spi: rockchip: simplify use_dma logic

We only need to know if we're using dma when setting
up the transfer, so just use a local variable for
that.

Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/spi/spi-rockchip.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 45a1479c1a29..ba60cbcd45c2 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -184,8 +184,6 @@ struct rockchip_spi {
 	void *rx_end;
 
 	bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
-
-	bool use_dma;
 };
 
 static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
@@ -450,7 +448,8 @@ static int rockchip_spi_prepare_dma(struct rockchip_spi *rs,
 }
 
 static void rockchip_spi_config(struct rockchip_spi *rs,
-		struct spi_device *spi, struct spi_transfer *xfer)
+		struct spi_device *spi, struct spi_transfer *xfer,
+		bool use_dma)
 {
 	u32 div = 0;
 	u32 dmacr = 0;
@@ -471,7 +470,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs,
 	else
 		cr0 |= CR0_XFM_TO << CR0_XFM_OFFSET;
 
-	if (rs->use_dma) {
+	if (use_dma) {
 		if (xfer->tx_buf)
 			dmacr |= TF_DMA_EN;
 		if (xfer->rx_buf)
@@ -537,6 +536,7 @@ static int rockchip_spi_transfer_one(
 		struct spi_transfer *xfer)
 {
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
+	bool use_dma;
 
 	WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
 		(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
@@ -559,15 +559,11 @@ static int rockchip_spi_transfer_one(
 	rs->rx = xfer->rx_buf;
 	rs->rx_end = rs->rx + xfer->len;
 
-	/* we need prepare dma before spi was enabled */
-	if (master->can_dma && master->can_dma(master, spi, xfer))
-		rs->use_dma = true;
-	else
-		rs->use_dma = false;
+	use_dma = master->can_dma ? master->can_dma(master, spi, xfer) : false;
 
-	rockchip_spi_config(rs, spi, xfer);
+	rockchip_spi_config(rs, spi, xfer, use_dma);
 
-	if (rs->use_dma)
+	if (use_dma)
 		return rockchip_spi_prepare_dma(rs, master, xfer);
 
 	return rockchip_spi_pio_transfer(rs);
-- 
2.19.0.rc2