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Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Browse Source 
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:
Linus Torvalds 2019-03-15 14:16:28 -07:00
commit 51b1ac0fa2
6 changed files with 29 additions and 16 deletions
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7
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -86,7 +86,6 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev)
struct i2c_timings *t = &dev->timings;
u32 ss_ht = 0, fp_ht = 0, hs_ht = 0, fs_ht = 0;
dev->adapter.nr = -1;
dev->tx_fifo_depth = 32;
dev->rx_fifo_depth = 32;
@ -219,7 +218,7 @@ static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
dev->mode = DW_IC_SLAVE;
}
static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev)
{
u32 param, tx_fifo_depth, rx_fifo_depth;
@ -233,7 +232,6 @@ static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
if (!dev->tx_fifo_depth) {
dev->tx_fifo_depth = tx_fifo_depth;
dev->rx_fifo_depth = rx_fifo_depth;
dev->adapter.nr = id;
} else if (tx_fifo_depth >= 2) {
dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
tx_fifo_depth);
@ -358,13 +356,14 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
}
dw_i2c_set_fifo_size(dev, pdev->id);
dw_i2c_set_fifo_size(dev);
adap = &dev->adapter;
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_DEPRECATED;
ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
adap->dev.of_node = pdev->dev.of_node;
adap->nr = -1;
dev_pm_set_driver_flags(&pdev->dev,
DPM_FLAG_SMART_PREPARE |

8
drivers/i2c/busses/i2c-mt65xx.c
View File

@ -503,7 +503,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CON_RX, i2c->pdmabase + OFFSET_CON);
dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_rd_buf)
return -ENOMEM;
@ -526,7 +526,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CON_TX, i2c->pdmabase + OFFSET_CON);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_wr_buf)
return -ENOMEM;
@ -549,7 +549,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_CON);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 0);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_wr_buf)
return -ENOMEM;
@ -561,7 +561,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
return -ENOMEM;
}
dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 0);
dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 1);
if (!dma_rd_buf) {
dma_unmap_single(i2c->dev, wpaddr,
msgs->len, DMA_TO_DEVICE);

15
drivers/i2c/busses/i2c-rcar.c
View File

@ -363,9 +363,6 @@ static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
struct dma_chan *chan = priv->dma_direction == DMA_FROM_DEVICE
? priv->dma_rx : priv->dma_tx;
/* Disable DMA Master Received/Transmitted */
rcar_i2c_write(priv, ICDMAER, 0);
dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg),
sg_dma_len(&priv->sg), priv->dma_direction);
@ -375,6 +372,9 @@ static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
priv->flags |= ID_P_NO_RXDMA;
priv->dma_direction = DMA_NONE;
/* Disable DMA Master Received/Transmitted, must be last! */
rcar_i2c_write(priv, ICDMAER, 0);
}
static void rcar_i2c_cleanup_dma(struct rcar_i2c_priv *priv)
@ -611,6 +611,15 @@ static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)
return true;
}
/*
* This driver has a lock-free design because there are IP cores (at least
* R-Car Gen2) which have an inherent race condition in their hardware design.
* There, we need to clear RCAR_BUS_MASK_DATA bits as soon as possible after
* the interrupt was generated, otherwise an unwanted repeated message gets
* generated. It turned out that taking a spinlock at the beginning of the ISR
* was already causing repeated messages. Thus, this driver was converted to
* the now lockless behaviour. Please keep this in mind when hacking the driver.
*/
static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
{
struct rcar_i2c_priv *priv = ptr;

4
drivers/i2c/busses/i2c-sis630.c
View File

@ -478,7 +478,7 @@ static int sis630_setup(struct pci_dev *sis630_dev)
if (!request_region(smbus_base + SMB_STS, SIS630_SMB_IOREGION,
sis630_driver.name)) {
dev_err(&sis630_dev->dev,
"I/O Region 0x%04hx-0x%04hx for SMBus already in use.\n",
"I/O Region 0x%04x-0x%04x for SMBus already in use.\n",
smbus_base + SMB_STS,
smbus_base + SMB_STS + SIS630_SMB_IOREGION - 1);
retval = -EBUSY;
@ -528,7 +528,7 @@ static int sis630_probe(struct pci_dev *dev, const struct pci_device_id *id)
sis630_adapter.dev.parent = &dev->dev;
snprintf(sis630_adapter.name, sizeof(sis630_adapter.name),
"SMBus SIS630 adapter at %04hx", smbus_base + SMB_STS);
"SMBus SIS630 adapter at %04x", smbus_base + SMB_STS);
return i2c_add_adapter(&sis630_adapter);
}

2
drivers/i2c/busses/i2c-stm32f7.c
View File

@ -432,7 +432,7 @@ static int stm32f7_i2c_compute_timing(struct stm32f7_i2c_dev *i2c_dev,
STM32F7_I2C_ANALOG_FILTER_DELAY_MAX : 0);
dnf_delay = setup->dnf * i2cclk;
sdadel_min = setup->fall_time - i2c_specs[setup->speed].hddat_min -
sdadel_min = i2c_specs[setup->speed].hddat_min + setup->fall_time -
af_delay_min - (setup->dnf + 3) * i2cclk;
sdadel_max = i2c_specs[setup->speed].vddat_max - setup->rise_time -

9
drivers/i2c/i2c-core-base.c
View File

@ -2258,7 +2258,8 @@ EXPORT_SYMBOL(i2c_put_adapter);
/**
* i2c_get_dma_safe_msg_buf() - get a DMA safe buffer for the given i2c_msg
* @msg: the message to be checked
* @threshold: the minimum number of bytes for which using DMA makes sense
* @threshold: the minimum number of bytes for which using DMA makes sense.
* Should at least be 1.
*
* Return: NULL if a DMA safe buffer was not obtained. Use msg->buf with PIO.
* Or a valid pointer to be used with DMA. After use, release it by
@ -2268,7 +2269,11 @@ EXPORT_SYMBOL(i2c_put_adapter);
*/
u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold)
{
if (msg->len < threshold)
/* also skip 0-length msgs for bogus thresholds of 0 */
if (!threshold)
pr_debug("DMA buffer for addr=0x%02x with length 0 is bogus\n",
msg->addr);
if (msg->len < threshold || msg->len == 0)
return NULL;
if (msg->flags & I2C_M_DMA_SAFE)