[PATCH v3 03/16] spi: dw: Discard static DW DMA slave structures
From: Serge Semin <hidden>
Date: 2020-05-21 01:22:58
Also in:
linux-mips, linux-spi, lkml
Subsystem:
spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
Having them declared is redundant since each struct dw_dma_chan has the same structure embedded and the structure from the passed dma_chan private pointer will be copied there as a result of the next calls chain: dma_request_channel() -> find_candidate() -> dma_chan_get() -> device_alloc_chan_resources() = dwc_alloc_chan_resources() -> dw_dma_filter(). So just remove the static dw_dma_chan structures and use a locally declared data instance with dst_id/src_id set to the same values as the static copies used to have. Co-developed-by: Georgy Vlasov <redacted> Signed-off-by: Georgy Vlasov <redacted> Co-developed-by: Ramil Zaripov <redacted> Signed-off-by: Ramil Zaripov <redacted> Signed-off-by: Serge Semin <redacted> Cc: Alexey Malahov <redacted> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <redacted> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - Explicitly initialize the dw_dma_slave members on stack. --- drivers/spi/spi-dw-mid.c | 19 ++++++++----------- drivers/spi/spi-dw.h | 2 -- 2 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
index cf99832ba271..8446bad0528c 100644
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c@@ -21,9 +21,6 @@ #define RX_BUSY 0 #define TX_BUSY 1 -static struct dw_dma_slave mid_dma_tx = { .dst_id = 1 }; -static struct dw_dma_slave mid_dma_rx = { .src_id = 0 }; - static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) { struct dw_dma_slave *s = param;
@@ -37,9 +34,11 @@ static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) { + struct dw_dma_slave slave = { + .src_id = 0, + .dst_id = 0 + }; struct pci_dev *dma_dev; - struct dw_dma_slave *tx = dws->dma_tx; - struct dw_dma_slave *rx = dws->dma_rx; dma_cap_mask_t mask; /*
@@ -54,14 +53,14 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) dma_cap_set(DMA_SLAVE, mask); /* 1. Init rx channel */ - rx->dma_dev = &dma_dev->dev; - dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, rx); + slave.dma_dev = &dma_dev->dev; + dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, &slave); if (!dws->rxchan) goto err_exit; /* 2. Init tx channel */ - tx->dma_dev = &dma_dev->dev; - dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, tx); + slave.dst_id = 1; + dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, &slave); if (!dws->txchan) goto free_rxchan;
@@ -386,8 +385,6 @@ static const struct dw_spi_dma_ops mfld_dma_ops = { static void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) { - dws->dma_tx = &mid_dma_tx; - dws->dma_rx = &mid_dma_rx; dws->dma_ops = &mfld_dma_ops; }
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 81364f501b7e..60e9e430ce7b 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h@@ -146,8 +146,6 @@ struct dw_spi { unsigned long dma_chan_busy; dma_addr_t dma_addr; /* phy address of the Data register */ const struct dw_spi_dma_ops *dma_ops; - void *dma_tx; - void *dma_rx; /* Bus interface info */ void *priv;
--
2.25.1