forked from luck/tmp_suning_uos_patched
Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "A set of driver bugfixes and an improvement for a core helper" * 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: i2c-designware-platdrv: Always use a dynamic adapter number i2c: i2c-designware-platdrv: Cleanup setting of the adapter number i2c: add extra check to safe DMA buffer helper i2c: i2c-stm32f7: Fix SDADEL minimum formula i2c: rcar: explain the lockless design i2c: rcar: fix concurrency issue related to ICDMAER i2c: sis630: correct format strings i2c: mediatek: modify threshold passed to i2c_get_dma_safe_msg_buf()
This commit is contained in:
commit
51b1ac0fa2
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@ -86,7 +86,6 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev)
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struct i2c_timings *t = &dev->timings;
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u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0;
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dev->adapter.nr = -1;
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dev->tx_fifo_depth = 32;
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dev->rx_fifo_depth = 32;
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@ -219,7 +218,7 @@ static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
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dev->mode = DW_IC_SLAVE;
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}
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static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
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static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev)
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{
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u32 param, tx_fifo_depth, rx_fifo_depth;
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@ -233,7 +232,6 @@ static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
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if (!dev->tx_fifo_depth) {
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dev->tx_fifo_depth = tx_fifo_depth;
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dev->rx_fifo_depth = rx_fifo_depth;
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dev->adapter.nr = id;
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} else if (tx_fifo_depth >= 2) {
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dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
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tx_fifo_depth);
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@ -358,13 +356,14 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
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div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
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}
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dw_i2c_set_fifo_size(dev, pdev->id);
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dw_i2c_set_fifo_size(dev);
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adap = &dev->adapter;
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adap->owner = THIS_MODULE;
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adap->class = I2C_CLASS_DEPRECATED;
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ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
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adap->dev.of_node = pdev->dev.of_node;
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adap->nr = -1;
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dev_pm_set_driver_flags(&pdev->dev,
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DPM_FLAG_SMART_PREPARE |
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@ -503,7 +503,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
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writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
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writel(I2C_DMA_CON_RX, i2c->pdmabase + OFFSET_CON);
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dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
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dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
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if (!dma_rd_buf)
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return -ENOMEM;
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@ -526,7 +526,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
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writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
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writel(I2C_DMA_CON_TX, i2c->pdmabase + OFFSET_CON);
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dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
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dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
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if (!dma_wr_buf)
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return -ENOMEM;
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@ -549,7 +549,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
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writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
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writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_CON);
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dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
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dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
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if (!dma_wr_buf)
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return -ENOMEM;
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@ -561,7 +561,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
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return -ENOMEM;
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}
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dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 0);
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dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 1);
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if (!dma_rd_buf) {
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dma_unmap_single(i2c->dev, wpaddr,
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msgs->len, DMA_TO_DEVICE);
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@ -363,9 +363,6 @@ static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
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struct dma_chan *chan = priv->dma_direction == DMA_FROM_DEVICE
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? priv->dma_rx : priv->dma_tx;
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/* Disable DMA Master Received/Transmitted */
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rcar_i2c_write(priv, ICDMAER, 0);
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dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg),
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sg_dma_len(&priv->sg), priv->dma_direction);
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@ -375,6 +372,9 @@ static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
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priv->flags |= ID_P_NO_RXDMA;
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priv->dma_direction = DMA_NONE;
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/* Disable DMA Master Received/Transmitted, must be last! */
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rcar_i2c_write(priv, ICDMAER, 0);
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}
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static void rcar_i2c_cleanup_dma(struct rcar_i2c_priv *priv)
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@ -611,6 +611,15 @@ static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)
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return true;
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}
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/*
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* This driver has a lock-free design because there are IP cores (at least
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* R-Car Gen2) which have an inherent race condition in their hardware design.
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* There, we need to clear RCAR_BUS_MASK_DATA bits as soon as possible after
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* the interrupt was generated, otherwise an unwanted repeated message gets
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* generated. It turned out that taking a spinlock at the beginning of the ISR
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* was already causing repeated messages. Thus, this driver was converted to
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* the now lockless behaviour. Please keep this in mind when hacking the driver.
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*/
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static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
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{
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struct rcar_i2c_priv *priv = ptr;
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@ -478,7 +478,7 @@ static int sis630_setup(struct pci_dev *sis630_dev)
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if (!request_region(smbus_base + SMB_STS, SIS630_SMB_IOREGION,
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sis630_driver.name)) {
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dev_err(&sis630_dev->dev,
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"I/O Region 0x%04hx-0x%04hx for SMBus already in use.\n",
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"I/O Region 0x%04x-0x%04x for SMBus already in use.\n",
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smbus_base + SMB_STS,
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smbus_base + SMB_STS + SIS630_SMB_IOREGION - 1);
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retval = -EBUSY;
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@ -528,7 +528,7 @@ static int sis630_probe(struct pci_dev *dev, const struct pci_device_id *id)
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sis630_adapter.dev.parent = &dev->dev;
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snprintf(sis630_adapter.name, sizeof(sis630_adapter.name),
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"SMBus SIS630 adapter at %04hx", smbus_base + SMB_STS);
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"SMBus SIS630 adapter at %04x", smbus_base + SMB_STS);
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return i2c_add_adapter(&sis630_adapter);
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}
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@ -432,7 +432,7 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
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STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0);
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dnf_delay = setup->dnf * i2cclk;
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sdadel_min = setup->fall_time - i2c_specs[setup->speed].hddat_min -
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sdadel_min = i2c_specs[setup->speed].hddat_min + setup->fall_time -
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af_delay_min - (setup->dnf + 3) * i2cclk;
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sdadel_max = i2c_specs[setup->speed].vddat_max - setup->rise_time -
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@ -2258,7 +2258,8 @@ EXPORT_SYMBOL(i2c_put_adapter);
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/**
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* i2c_get_dma_safe_msg_buf() - get a DMA safe buffer for the given i2c_msg
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* @msg: the message to be checked
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* @threshold: the minimum number of bytes for which using DMA makes sense
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* @threshold: the minimum number of bytes for which using DMA makes sense.
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* Should at least be 1.
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*
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* Return: NULL if a DMA safe buffer was not obtained. Use msg->buf with PIO.
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* Or a valid pointer to be used with DMA. After use, release it by
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@ -2268,7 +2269,11 @@ EXPORT_SYMBOL(i2c_put_adapter);
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*/
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u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold)
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{
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if (msg->len < threshold)
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/* also skip 0-length msgs for bogus thresholds of 0 */
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if (!threshold)
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pr_debug("DMA buffer for addr=0x%02x with length 0 is bogus\n",
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msg->addr);
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if (msg->len < threshold || msg->len == 0)
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return NULL;
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if (msg->flags & I2C_M_DMA_SAFE)
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