diff options
Diffstat (limited to 'drivers/spi/spi-qup.c')
| -rw-r--r-- | drivers/spi/spi-qup.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 4b6f6b2521..2af63040ac 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -6,12 +6,14 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/err.h> +#include <linux/interconnect.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/list.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/pm_opp.h> #include <linux/pm_runtime.h> #include <linux/spi/spi.h> #include <linux/dmaengine.h> @@ -121,11 +123,14 @@ #define SPI_DELAY_THRESHOLD 1 #define SPI_DELAY_RETRY 10 +#define SPI_BUS_WIDTH 8 + struct spi_qup { void __iomem *base; struct device *dev; struct clk *cclk; /* core clock */ struct clk *iclk; /* interface clock */ + struct icc_path *icc_path; /* interconnect to RAM */ int irq; spinlock_t lock; @@ -148,6 +153,8 @@ struct spi_qup { int mode; struct dma_slave_config rx_conf; struct dma_slave_config tx_conf; + + u32 bw_speed_hz; }; static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer); @@ -180,6 +187,23 @@ static inline bool spi_qup_is_valid_state(struct spi_qup *controller) return opstate & QUP_STATE_VALID; } +static int spi_qup_vote_bw(struct spi_qup *controller, u32 speed_hz) +{ + u32 needed_peak_bw; + int ret; + + if (controller->bw_speed_hz == speed_hz) + return 0; + + needed_peak_bw = Bps_to_icc(speed_hz * SPI_BUS_WIDTH); + ret = icc_set_bw(controller->icc_path, 0, needed_peak_bw); + if (ret) + return ret; + + controller->bw_speed_hz = speed_hz; + return 0; +} + static int spi_qup_set_state(struct spi_qup *controller, u32 state) { unsigned long loop; @@ -450,6 +474,12 @@ static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer, struct scatterlist *tx_sgl, *rx_sgl; int ret; + ret = spi_qup_vote_bw(qup, xfer->speed_hz); + if (ret) { + dev_err(qup->dev, "fail to vote for ICC bandwidth: %d\n", ret); + return -EIO; + } + if (xfer->rx_buf) rx_done = spi_qup_dma_done; else if (xfer->tx_buf) @@ -667,7 +697,7 @@ static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer) return -EIO; } - ret = clk_set_rate(controller->cclk, xfer->speed_hz); + ret = dev_pm_opp_set_rate(controller->dev, xfer->speed_hz); if (ret) { dev_err(controller->dev, "fail to set frequency %d", xfer->speed_hz); @@ -993,6 +1023,7 @@ static void spi_qup_set_cs(struct spi_device *spi, bool val) static int spi_qup_probe(struct platform_device *pdev) { struct spi_controller *host; + struct icc_path *icc_path; struct clk *iclk, *cclk; struct spi_qup *controller; struct resource *res; @@ -1018,6 +1049,11 @@ static int spi_qup_probe(struct platform_device *pdev) if (IS_ERR(iclk)) return PTR_ERR(iclk); + icc_path = devm_of_icc_get(dev, NULL); + if (IS_ERR(icc_path)) + return dev_err_probe(dev, PTR_ERR(icc_path), + "failed to get interconnect path\n"); + /* This is optional parameter */ if (of_property_read_u32(dev->of_node, "spi-max-frequency", &max_freq)) max_freq = SPI_MAX_RATE; @@ -1027,6 +1063,15 @@ static int spi_qup_probe(struct platform_device *pdev) return -ENXIO; } + ret = devm_pm_opp_set_clkname(dev, "core"); + if (ret) + return ret; + + /* OPP table is optional */ + ret = devm_pm_opp_of_add_table(dev); + if (ret && ret != -ENODEV) + return dev_err_probe(dev, ret, "invalid OPP table\n"); + host = spi_alloc_host(dev, sizeof(struct spi_qup)); if (!host) { dev_err(dev, "cannot allocate host\n"); @@ -1060,6 +1105,7 @@ static int spi_qup_probe(struct platform_device *pdev) controller->base = base; controller->iclk = iclk; controller->cclk = cclk; + controller->icc_path = icc_path; controller->irq = irq; ret = spi_qup_init_dma(host, res->start); @@ -1180,6 +1226,7 @@ static int spi_qup_pm_suspend_runtime(struct device *device) writel_relaxed(config, controller->base + QUP_CONFIG); clk_disable_unprepare(controller->cclk); + spi_qup_vote_bw(controller, 0); clk_disable_unprepare(controller->iclk); return 0; @@ -1231,6 +1278,7 @@ static int spi_qup_suspend(struct device *device) return ret; clk_disable_unprepare(controller->cclk); + spi_qup_vote_bw(controller, 0); clk_disable_unprepare(controller->iclk); return 0; } |