Current driver supports only PIO mode. HW supports DMA, so add DMA mode support to the driver for better performance for larger xfers. Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202304050512.MN2oNY9Z-lkp@xxxxxxxxx/ Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@xxxxxxxxxxx> --- v1 -> v2: - modified commit message - addressed kernel test robot error - correct placement of header file includes - added more comments - coding style related changes - renamed variables - used u32/u8 instead of uint32_t/8_t - removed unnecessary casting - retain same MSTR_CONFIG as PIO for DMA --- drivers/spi/spi-qcom-qspi.c | 434 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 403 insertions(+), 31 deletions(-) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index fab1553..1b53480 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -2,6 +2,8 @@ // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. #include <linux/clk.h> +#include <linux/dmapool.h> +#include <linux/dma-mapping.h> #include <linux/interconnect.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -14,7 +16,6 @@ #include <linux/spi/spi.h> #include <linux/spi/spi-mem.h> - #define QSPI_NUM_CS 2 #define QSPI_BYTES_PER_WORD 4 @@ -62,6 +63,7 @@ #define WR_FIFO_FULL BIT(10) #define WR_FIFO_OVERRUN BIT(11) #define TRANSACTION_DONE BIT(16) +#define DMA_CHAIN_DONE BIT(31) #define QSPI_ERR_IRQS (RESP_FIFO_UNDERRUN | HRESP_FROM_NOC_ERR | \ WR_FIFO_OVERRUN) #define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \ @@ -108,6 +110,10 @@ #define RD_FIFO_RESET 0x0030 #define RESET_FIFO BIT(0) +#define NEXT_DMA_DESC_ADDR 0x0040 +#define CURRENT_DMA_DESC_ADDR 0x0044 +#define CURRENT_MEM_ADDR 0x0048 + #define CUR_MEM_ADDR 0x0048 #define HW_VERSION 0x004c #define RD_FIFO 0x0050 @@ -120,6 +126,27 @@ enum qspi_dir { QSPI_WRITE, }; +struct qspi_cmd_desc { + u32 data_address; + u32 next_descriptor; + u32 direction:1; + u32 multi_io_mode:3; + u32 reserved1:4; + u32 fragment:1; + u32 reserved2:7; + u32 length:16; + /* + * This marks end of HW cmd descriptor + * Fields down below are for SW usage to + * copy data from DMA buffer to rx buffer + */ + u8 *bounce_src; + u8 *bounce_dst; + u32 bounce_length; +}; + +#define QSPI_MAX_NUM_DESC 5 + struct qspi_xfer { union { const void *tx_buf; @@ -137,11 +164,36 @@ enum qspi_clocks { QSPI_NUM_CLKS }; +enum qspi_xfer_mode { + QSPI_INVALID, + QSPI_FIFO, + QSPI_DMA +}; + +/* number of entries in sgt returned from spi framework that we can support */ +#define QSPI_MAX_SG 5 + +/* 3 descriptors for head, aligned part and tail */ +#define QSPI_NUM_CMD_DESC 3 + +/* 2 descriptors for head, tail */ +#define QSPI_NUM_DAT_DESC 2 + struct qcom_qspi { void __iomem *base; struct device *dev; struct clk_bulk_data *clks; struct qspi_xfer xfer; + struct dma_pool *dma_cmd_pool; + struct dma_pool *dma_data_pool; + dma_addr_t dma_cmd_desc[QSPI_NUM_CMD_DESC*QSPI_MAX_SG]; + dma_addr_t dma_data_desc[QSPI_NUM_DAT_DESC*QSPI_MAX_SG]; + void *virt_cmd_desc[QSPI_NUM_CMD_DESC*QSPI_MAX_SG]; + void *virt_data_desc[QSPI_NUM_DAT_DESC*QSPI_MAX_SG]; + unsigned int n_cmd_desc; + unsigned int n_data_desc; + int xfer_mode; + u32 iomode; struct icc_path *icc_path_cpu_to_qspi; unsigned long last_speed; /* Lock to protect data accessed by IRQs */ @@ -151,18 +203,25 @@ struct qcom_qspi { static u32 qspi_buswidth_to_iomode(struct qcom_qspi *ctrl, unsigned int buswidth) { + u32 ret; + + /* for DMA we don't write to PIO_XFER_CFG register, so don't shift */ switch (buswidth) { case 1: - return SDR_1BIT << MULTI_IO_MODE_SHFT; + ret = (ctrl->xfer_mode == QSPI_DMA ? SDR_1BIT : SDR_1BIT << MULTI_IO_MODE_SHFT); + break; case 2: - return SDR_2BIT << MULTI_IO_MODE_SHFT; + ret = (ctrl->xfer_mode == QSPI_DMA ? SDR_2BIT : SDR_2BIT << MULTI_IO_MODE_SHFT); + break; case 4: - return SDR_4BIT << MULTI_IO_MODE_SHFT; + ret = (ctrl->xfer_mode == QSPI_DMA ? SDR_4BIT : SDR_4BIT << MULTI_IO_MODE_SHFT); + break; default: dev_warn_once(ctrl->dev, "Unexpected bus width: %u\n", buswidth); - return SDR_1BIT << MULTI_IO_MODE_SHFT; + ret = (ctrl->xfer_mode == QSPI_DMA ? SDR_1BIT : SDR_1BIT << MULTI_IO_MODE_SHFT); } + return ret; } static void qcom_qspi_pio_xfer_cfg(struct qcom_qspi *ctrl) @@ -223,6 +282,21 @@ static void qcom_qspi_handle_err(struct spi_master *master, spin_lock_irqsave(&ctrl->lock, flags); writel(0, ctrl->base + MSTR_INT_EN); ctrl->xfer.rem_bytes = 0; + + if (ctrl->xfer_mode == QSPI_DMA) { + int i; + + /* free cmd and data descriptors */ + for (i = 0; i < ctrl->n_data_desc; i++) + dma_pool_free(ctrl->dma_data_pool, ctrl->virt_data_desc[i], + ctrl->dma_data_desc[i]); + ctrl->n_data_desc = 0; + + for (i = 0; i < ctrl->n_cmd_desc; i++) + dma_pool_free(ctrl->dma_cmd_pool, ctrl->virt_cmd_desc[i], + ctrl->dma_cmd_desc[i]); + ctrl->n_cmd_desc = 0; + } spin_unlock_irqrestore(&ctrl->lock, flags); } @@ -230,6 +304,7 @@ static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) { int ret; unsigned int avg_bw_cpu; + unsigned int peak_bw_cpu; if (speed_hz == ctrl->last_speed) return 0; @@ -241,12 +316,16 @@ static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) return ret; } + avg_bw_cpu = Bps_to_icc(speed_hz); /* - * Set BW quota for CPU as driver supports FIFO mode only. - * We don't have explicit peak requirement so keep it equal to avg_bw. + * Set BW quota for CPU for FIFO to avg_bw + * as we don't have explicit peak requirement. + * TBD TBD TBD - change this as required for DMA. + * As of now same peak requirement seems to be working. */ - avg_bw_cpu = Bps_to_icc(speed_hz); - ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, avg_bw_cpu, avg_bw_cpu); + peak_bw_cpu = ctrl->xfer_mode == QSPI_FIFO ? avg_bw_cpu : avg_bw_cpu; + + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, avg_bw_cpu, peak_bw_cpu); if (ret) { dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu: %d\n", __func__, ret); @@ -258,6 +337,190 @@ static int qcom_qspi_set_speed(struct qcom_qspi *ctrl, unsigned long speed_hz) return 0; } +/* aligned to 32 bytes, not to cross 1KB boundary */ +#define QSPI_ALIGN_REQ 32 +#define QSPI_BOUNDARY_REQ 1024 + +static int qcom_qspi_alloc_desc(struct qcom_qspi *ctrl, uint8_t *virt_ptr, + dma_addr_t dma_ptr, uint32_t n_bytes) +{ + struct qspi_cmd_desc *virt_cmd_desc, *prev; + uint8_t *virt_data_desc; + dma_addr_t dma_cmd_desc, dma_data_desc; + + if (virt_ptr && n_bytes >= QSPI_ALIGN_REQ) { + dev_err(ctrl->dev, + "Exiting to avert memory overwrite, n_bytes-%d\n", n_bytes); + return -ENOMEM; + } + + /* allocate for dma cmd descriptor */ + virt_cmd_desc = (struct qspi_cmd_desc *)dma_pool_alloc(ctrl->dma_cmd_pool, + GFP_KERNEL, &dma_cmd_desc); + if (!virt_cmd_desc) { + dev_err(ctrl->dev, + "Could not allocate for cmd_desc\n"); + return -ENOMEM; + } + ctrl->virt_cmd_desc[ctrl->n_cmd_desc] = virt_cmd_desc; + ctrl->dma_cmd_desc[ctrl->n_cmd_desc] = dma_cmd_desc; + ctrl->n_cmd_desc++; + + /* allocate for dma data descriptor if unaligned else use pre-aligned */ + if (virt_ptr) { + virt_data_desc = (uint8_t *)dma_pool_zalloc(ctrl->dma_data_pool, + GFP_KERNEL, &dma_data_desc); + if (!virt_data_desc) { + dev_err(ctrl->dev, + "Could not allocate for data_desc\n"); + return -ENOMEM; + } + ctrl->virt_data_desc[ctrl->n_data_desc] = virt_data_desc; + ctrl->dma_data_desc[ctrl->n_data_desc] = dma_data_desc; + ctrl->n_data_desc++; + + /* + * for tx copy xfer data into allocated buffer + * for rx setup bounce info to copy after xfer + */ + if (ctrl->xfer.dir == QSPI_WRITE) { + memcpy(virt_data_desc, virt_ptr, n_bytes); + } else { + virt_cmd_desc->bounce_src = virt_data_desc; + virt_cmd_desc->bounce_dst = virt_ptr; + virt_cmd_desc->bounce_length = n_bytes; + } + } else { + dma_data_desc = dma_ptr; + } + + /* setup cmd descriptor */ + virt_cmd_desc->data_address = dma_data_desc; + virt_cmd_desc->next_descriptor = 0; + virt_cmd_desc->direction = ctrl->xfer.dir; + virt_cmd_desc->multi_io_mode = ctrl->iomode; + virt_cmd_desc->reserved1 = 0; + virt_cmd_desc->fragment = 0; + virt_cmd_desc->reserved2 = 0; + virt_cmd_desc->length = n_bytes; + + /* update previous descriptor */ + if (ctrl->n_cmd_desc >= 2) { + prev = (ctrl->virt_cmd_desc)[ctrl->n_cmd_desc - 2]; + prev->next_descriptor = dma_cmd_desc; + prev->fragment = 1; + } + + return 0; +} + +static int qcom_qspi_setup_dma_desc(struct qcom_qspi *ctrl, + struct spi_transfer *xfer) +{ + int ret; + struct sg_table *sgt; + unsigned int sg_total_len = 0; + dma_addr_t dma_ptr_sg; + unsigned int dma_len_sg; + uint32_t prolog_bytes, aligned_bytes, epilog_bytes; + dma_addr_t aligned_addr; + int i; + uint8_t *byte_ptr; + + if (ctrl->n_cmd_desc || ctrl->n_data_desc) { + dev_err(ctrl->dev, "Remnant dma buffers cmd-%d, data-%d\n", + ctrl->n_cmd_desc, ctrl->n_data_desc); + return -EIO; + } + + sgt = (ctrl->xfer.dir == QSPI_READ) ? &xfer->rx_sg : &xfer->tx_sg; + if (!sgt->nents || sgt->nents > QSPI_MAX_SG) { + dev_err(ctrl->dev, "Cannot handle %d entries in scatter list\n", sgt->nents); + return -EINVAL; + } + + for (i = 0; i < sgt->nents; i++) + sg_total_len += sg_dma_len(sgt->sgl + i); + if (sg_total_len != xfer->len) { + dev_err(ctrl->dev, "Data lengths mismatch\n"); + return -EINVAL; + } + + if (ctrl->xfer.dir == QSPI_READ) + byte_ptr = xfer->rx_buf; + else + byte_ptr = (uint8_t *)xfer->tx_buf; + + for (i = 0; i < sgt->nents; i++) { + dma_ptr_sg = sg_dma_address(sgt->sgl + i); + dma_len_sg = sg_dma_len(sgt->sgl + i); + + aligned_addr = PTR_ALIGN(dma_ptr_sg, QSPI_ALIGN_REQ); + + prolog_bytes = min(dma_len_sg, (unsigned int)(aligned_addr - dma_ptr_sg)); + if (prolog_bytes) { + ret = qcom_qspi_alloc_desc(ctrl, byte_ptr, 0, prolog_bytes); + if (ret) + goto cleanup; + byte_ptr += prolog_bytes; + } + + aligned_bytes = PTR_ALIGN_DOWN(dma_len_sg - prolog_bytes, QSPI_ALIGN_REQ); + if (aligned_bytes) { + ret = qcom_qspi_alloc_desc(ctrl, 0, aligned_addr, aligned_bytes); + if (ret) + goto cleanup; + byte_ptr += aligned_bytes; + } + + epilog_bytes = dma_len_sg - prolog_bytes - aligned_bytes; + if (epilog_bytes) { + ret = qcom_qspi_alloc_desc(ctrl, byte_ptr, 0, epilog_bytes); + if (ret) + goto cleanup; + byte_ptr += epilog_bytes; + } + } + return 0; + +cleanup: + dev_err(ctrl->dev, "ERROR cleanup in setup_dma_desc\n"); + for (i = 0; i < ctrl->n_data_desc; i++) + dma_pool_free(ctrl->dma_data_pool, ctrl->virt_data_desc[i], + ctrl->dma_data_desc[i]); + ctrl->n_data_desc = 0; + + for (i = 0; i < ctrl->n_cmd_desc; i++) + dma_pool_free(ctrl->dma_cmd_pool, ctrl->virt_cmd_desc[i], + ctrl->dma_cmd_desc[i]); + ctrl->n_cmd_desc = 0; + return ret; +} + +static void qcom_qspi_dma_xfer(struct qcom_qspi *ctrl) +{ + /* Ack any previous interrupts that might be hanging around */ + writel(DMA_CHAIN_DONE, ctrl->base + MSTR_INT_STATUS); + + /* Setup new interrupts */ + writel(DMA_CHAIN_DONE, ctrl->base + MSTR_INT_EN); + + /* flush all writes */ + wmb(); + + /* kick off transfer */ + writel((uint32_t)(uintptr_t)(ctrl->dma_cmd_desc)[0], ctrl->base + NEXT_DMA_DESC_ADDR); +} + +/* Switch to DMA if transfer length exceeds this */ +#define QSPI_MAX_BYTES_FIFO 64 + +static bool qcom_qspi_can_dma(struct spi_controller *ctlr, + struct spi_device *slv, struct spi_transfer *xfer) +{ + return xfer->len > QSPI_MAX_BYTES_FIFO ? true : false; +} + static int qcom_qspi_transfer_one(struct spi_master *master, struct spi_device *slv, struct spi_transfer *xfer) @@ -266,6 +529,7 @@ static int qcom_qspi_transfer_one(struct spi_master *master, int ret; unsigned long speed_hz; unsigned long flags; + u32 mstr_cfg; speed_hz = slv->max_speed_hz; if (xfer->speed_hz) @@ -276,6 +540,7 @@ static int qcom_qspi_transfer_one(struct spi_master *master, return ret; spin_lock_irqsave(&ctrl->lock, flags); + mstr_cfg = readl(ctrl->base + MSTR_CONFIG); /* We are half duplex, so either rx or tx will be set */ if (xfer->rx_buf) { @@ -290,7 +555,25 @@ static int qcom_qspi_transfer_one(struct spi_master *master, ctrl->xfer.is_last = list_is_last(&xfer->transfer_list, &master->cur_msg->transfers); ctrl->xfer.rem_bytes = xfer->len; - qcom_qspi_pio_xfer(ctrl); + + if (qcom_qspi_can_dma(master, slv, xfer)) { + ctrl->xfer_mode = QSPI_DMA; + ctrl->iomode = qspi_buswidth_to_iomode(ctrl, ctrl->xfer.buswidth); + mstr_cfg |= DMA_ENABLE; + writel(mstr_cfg, ctrl->base + MSTR_CONFIG); + + ret = qcom_qspi_setup_dma_desc(ctrl, xfer); + if (ret) { + spin_unlock_irqrestore(&ctrl->lock, flags); + return ret; + } + qcom_qspi_dma_xfer(ctrl); + } else { + ctrl->xfer_mode = QSPI_FIFO; + mstr_cfg &= ~DMA_ENABLE; + writel(mstr_cfg, ctrl->base + MSTR_CONFIG); + qcom_qspi_pio_xfer(ctrl); + } spin_unlock_irqrestore(&ctrl->lock, flags); @@ -328,6 +611,40 @@ static int qcom_qspi_prepare_message(struct spi_master *master, return 0; } +static int qcom_qspi_alloc_dma(struct qcom_qspi *ctrl) +{ + /* allocate for cmd descriptors pool */ + ctrl->dma_cmd_pool = dma_pool_create("qspi cmd desc pool", + ctrl->dev, sizeof(struct qspi_cmd_desc), 0, 0); + if (!ctrl->dma_cmd_pool) { + dev_err(ctrl->dev, "Could not create dma pool for cmd_desc\n"); + return -ENOMEM; + } + + /* + * allocate for data descriptors pool as per alignment + * and boundary requirements + */ + ctrl->dma_data_pool = dma_pool_create("qspi data desc pool", + ctrl->dev, QSPI_ALIGN_REQ, QSPI_ALIGN_REQ, QSPI_BOUNDARY_REQ); + if (!ctrl->dma_data_pool) { + dev_err(ctrl->dev, "Could not create dma pool for data desc\n"); + dma_pool_destroy(ctrl->dma_cmd_pool); + return -ENOMEM; + } + + return 0; +} + +static void qcom_qspi_free_dma(struct qcom_qspi *ctrl) +{ + /* free pool buffers */ + dma_pool_destroy(ctrl->dma_data_pool); + + /* free pool */ + dma_pool_destroy(ctrl->dma_cmd_pool); +} + static irqreturn_t pio_read(struct qcom_qspi *ctrl) { u32 rd_fifo_status; @@ -426,27 +743,63 @@ static irqreturn_t qcom_qspi_irq(int irq, void *dev_id) int_status = readl(ctrl->base + MSTR_INT_STATUS); writel(int_status, ctrl->base + MSTR_INT_STATUS); - if (ctrl->xfer.dir == QSPI_WRITE) { - if (int_status & WR_FIFO_EMPTY) - ret = pio_write(ctrl); - } else { - if (int_status & RESP_FIFO_RDY) - ret = pio_read(ctrl); - } - - if (int_status & QSPI_ERR_IRQS) { - if (int_status & RESP_FIFO_UNDERRUN) - dev_err(ctrl->dev, "IRQ error: FIFO underrun\n"); - if (int_status & WR_FIFO_OVERRUN) - dev_err(ctrl->dev, "IRQ error: FIFO overrun\n"); - if (int_status & HRESP_FROM_NOC_ERR) - dev_err(ctrl->dev, "IRQ error: NOC response error\n"); - ret = IRQ_HANDLED; - } - - if (!ctrl->xfer.rem_bytes) { - writel(0, ctrl->base + MSTR_INT_EN); - spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); + switch (ctrl->xfer_mode) { + case QSPI_FIFO: + if (ctrl->xfer.dir == QSPI_WRITE) { + if (int_status & WR_FIFO_EMPTY) + ret = pio_write(ctrl); + } else { + if (int_status & RESP_FIFO_RDY) + ret = pio_read(ctrl); + } + + if (int_status & QSPI_ERR_IRQS) { + if (int_status & RESP_FIFO_UNDERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO underrun\n"); + if (int_status & WR_FIFO_OVERRUN) + dev_err(ctrl->dev, "IRQ error: FIFO overrun\n"); + if (int_status & HRESP_FROM_NOC_ERR) + dev_err(ctrl->dev, "IRQ error: NOC response error\n"); + ret = IRQ_HANDLED; + } + + if (!ctrl->xfer.rem_bytes) { + writel(0, ctrl->base + MSTR_INT_EN); + spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); + } + break; + case QSPI_DMA: + if (int_status & DMA_CHAIN_DONE) { + int i; + + writel(0, ctrl->base + MSTR_INT_EN); + + if (ctrl->xfer.dir == QSPI_READ) { + struct qspi_cmd_desc *cmd_desc; + + for (i = 0; i < ctrl->n_cmd_desc; i++) { + cmd_desc = (struct qspi_cmd_desc *)ctrl->virt_cmd_desc[i]; + memcpy(cmd_desc->bounce_dst, + cmd_desc->bounce_src, cmd_desc->bounce_length); + } + } + + for (i = 0; i < ctrl->n_data_desc; i++) + dma_pool_free(ctrl->dma_data_pool, ctrl->virt_data_desc[i], + ctrl->dma_data_desc[i]); + ctrl->n_data_desc = 0; + + for (i = 0; i < ctrl->n_cmd_desc; i++) + dma_pool_free(ctrl->dma_cmd_pool, ctrl->virt_cmd_desc[i], + ctrl->dma_cmd_desc[i]); + ctrl->n_cmd_desc = 0; + + ret = IRQ_HANDLED; + spi_finalize_current_transfer(dev_get_drvdata(ctrl->dev)); + } + break; + default: + dev_err(ctrl->dev, "Unknown xfer mode:%d", ctrl->xfer_mode); } spin_unlock(&ctrl->lock); @@ -487,6 +840,9 @@ static int qcom_qspi_probe(struct platform_device *pdev) if (ret) return ret; + /* set default mode to FIFO */ + ctrl->xfer_mode = QSPI_FIFO; + ctrl->icc_path_cpu_to_qspi = devm_of_icc_get(dev, "qspi-config"); if (IS_ERR(ctrl->icc_path_cpu_to_qspi)) return dev_err_probe(dev, PTR_ERR(ctrl->icc_path_cpu_to_qspi), @@ -517,7 +873,12 @@ static int qcom_qspi_probe(struct platform_device *pdev) return ret; } + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + return dev_err_probe(dev, ret, "could not set DMA mask\n"); + master->max_speed_hz = 300000000; + master->max_dma_len = 65536; /* as per HPG */ master->num_chipselect = QSPI_NUM_CS; master->bus_num = -1; master->dev.of_node = pdev->dev.of_node; @@ -528,6 +889,7 @@ static int qcom_qspi_probe(struct platform_device *pdev) master->prepare_message = qcom_qspi_prepare_message; master->transfer_one = qcom_qspi_transfer_one; master->handle_err = qcom_qspi_handle_err; + master->can_dma = qcom_qspi_can_dma; master->auto_runtime_pm = true; ret = devm_pm_opp_set_clkname(&pdev->dev, "core"); @@ -540,6 +902,11 @@ static int qcom_qspi_probe(struct platform_device *pdev) return ret; } + /* allocate for DMA descriptor pools */ + ret = qcom_qspi_alloc_dma(ctrl); + if (ret) + return ret; + pm_runtime_use_autosuspend(dev); pm_runtime_set_autosuspend_delay(dev, 250); pm_runtime_enable(dev); @@ -556,10 +923,15 @@ static int qcom_qspi_probe(struct platform_device *pdev) static void qcom_qspi_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); + struct qcom_qspi *ctrl; + + ctrl = spi_master_get_devdata(master); /* Unregister _before_ disabling pm_runtime() so we stop transfers */ spi_unregister_master(master); + qcom_qspi_free_dma(ctrl); + pm_runtime_disable(&pdev->dev); } -- Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by the Linux Foundation.
