From 9a5382e8ffe86412f442f6a34fde43f94aae530b Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Mon, 22 Aug 2016 16:52:21 +0200 Subject: i2c: mux: demux-pinctrl: invalidate properly when switching fails Make sure the index to the active channel is invalidated when switching fails. Signed-off-by: Wolfram Sang Signed-off-by: Wolfram Sang --- drivers/i2c/muxes/i2c-demux-pinctrl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c index 215ac87f606d..b6b9d2582fac 100644 --- a/drivers/i2c/muxes/i2c-demux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c @@ -107,6 +107,7 @@ static int i2c_demux_activate_master(struct i2c_demux_pinctrl_priv *priv, u32 ne of_changeset_revert(&priv->chan[new_chan].chgset); err: dev_err(priv->dev, "failed to setup demux-adapter %d (%d)\n", new_chan, ret); + priv->cur_chan = -EINVAL; return ret; } -- cgit From 488d69ea72457c7566b36eb0d484d579f19963c5 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Wed, 24 Aug 2016 11:19:28 +0200 Subject: i2c: sh_mobile: use proper device with dma_mapping_error We must use the same device we used for mapping. Signed-off-by: Wolfram Sang Reviewed-by: Geert Uytterhoeven Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-sh_mobile.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index 6fb3e2645992..05b1eeab9cf5 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -610,7 +610,7 @@ static void sh_mobile_i2c_xfer_dma(struct sh_mobile_i2c_data *pd) return; dma_addr = dma_map_single(chan->device->dev, pd->msg->buf, pd->msg->len, dir); - if (dma_mapping_error(pd->dev, dma_addr)) { + if (dma_mapping_error(chan->device->dev, dma_addr)) { dev_dbg(pd->dev, "dma map failed, using PIO\n"); return; } -- cgit From c13c29186c59b056d6ec141b5967c2ca3efc0c16 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Wed, 24 Aug 2016 11:19:29 +0200 Subject: i2c: rcar: use proper device with dma_mapping_error We must use the same device we used for mapping. Signed-off-by: Wolfram Sang Reviewed-by: Geert Uytterhoeven Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rcar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 52407f3c9e1c..9bd849dacee8 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -378,7 +378,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv) } dma_addr = dma_map_single(chan->device->dev, buf, len, dir); - if (dma_mapping_error(dev, dma_addr)) { + if (dma_mapping_error(chan->device->dev, dma_addr)) { dev_dbg(dev, "dma map failed, using PIO\n"); return; } -- cgit From b31cc4b37e8e33e84e9f990d0d84387f37ef01a1 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Mon, 15 Aug 2016 00:47:22 +0200 Subject: i2c: bcm-kona: fix inconsistent indenting smatch rightfully says: drivers/i2c/busses/i2c-bcm-kona.c:646 bcm_kona_i2c_xfer() warn: inconsistent indenting Signed-off-by: Wolfram Sang Reviewed-by: Tim Kryger --- drivers/i2c/busses/i2c-bcm-kona.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-bcm-kona.c b/drivers/i2c/busses/i2c-bcm-kona.c index f98743277e3c..258cb9a40ab3 100644 --- a/drivers/i2c/busses/i2c-bcm-kona.c +++ b/drivers/i2c/busses/i2c-bcm-kona.c @@ -643,7 +643,7 @@ static int bcm_kona_i2c_xfer(struct i2c_adapter *adapter, if (rc < 0) { dev_err(dev->device, "restart cmd failed rc = %d\n", rc); - goto xfer_send_stop; + goto xfer_send_stop; } } -- cgit From e35478eac030990e23a56bf11dc074c5a069124a Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 23 Aug 2016 17:28:03 +0200 Subject: i2c: mux: demux-pinctrl: run properly with multiple instances We can't use a static property for all the changesets, so we now create dynamic ones for each changeset. Signed-off-by: Wolfram Sang Fixes: 50a5ba87690814 ("i2c: mux: demux-pinctrl: add driver") Signed-off-by: Wolfram Sang --- drivers/i2c/muxes/i2c-demux-pinctrl.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/muxes/i2c-demux-pinctrl.c b/drivers/i2c/muxes/i2c-demux-pinctrl.c index b6b9d2582fac..b3893f6282ba 100644 --- a/drivers/i2c/muxes/i2c-demux-pinctrl.c +++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c @@ -37,8 +37,6 @@ struct i2c_demux_pinctrl_priv { struct i2c_demux_pinctrl_chan chan[]; }; -static struct property status_okay = { .name = "status", .length = 3, .value = "ok" }; - static int i2c_demux_master_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) { struct i2c_demux_pinctrl_priv *priv = adap->algo_data; @@ -193,6 +191,7 @@ static int i2c_demux_pinctrl_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct i2c_demux_pinctrl_priv *priv; + struct property *props; int num_chan, i, j, err; num_chan = of_count_phandle_with_args(np, "i2c-parent", NULL); @@ -203,7 +202,10 @@ static int i2c_demux_pinctrl_probe(struct platform_device *pdev) priv = devm_kzalloc(&pdev->dev, sizeof(*priv) + num_chan * sizeof(struct i2c_demux_pinctrl_chan), GFP_KERNEL); - if (!priv) + + props = devm_kcalloc(&pdev->dev, num_chan, sizeof(*props), GFP_KERNEL); + + if (!priv || !props) return -ENOMEM; err = of_property_read_string(np, "i2c-bus-name", &priv->bus_name); @@ -221,8 +223,12 @@ static int i2c_demux_pinctrl_probe(struct platform_device *pdev) } priv->chan[i].parent_np = adap_np; + props[i].name = devm_kstrdup(&pdev->dev, "status", GFP_KERNEL); + props[i].value = devm_kstrdup(&pdev->dev, "ok", GFP_KERNEL); + props[i].length = 3; + of_changeset_init(&priv->chan[i].chgset); - of_changeset_update_property(&priv->chan[i].chgset, adap_np, &status_okay); + of_changeset_update_property(&priv->chan[i].chgset, adap_np, &props[i]); } priv->num_chan = num_chan; -- cgit From 30851a7c2155d0b321485e66386ea99191d8b3f5 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Thu, 25 Aug 2016 19:27:40 +0200 Subject: Documentation: i2c: slave-interface: add note for driver development Make it clear that adding slave support shall not disable master functionality. We can have both, so we should. Signed-off-by: Wolfram Sang --- Documentation/i2c/slave-interface | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/i2c/slave-interface b/Documentation/i2c/slave-interface index 80807adb8ded..7e2a228f21bc 100644 --- a/Documentation/i2c/slave-interface +++ b/Documentation/i2c/slave-interface @@ -145,6 +145,11 @@ If you want to add slave support to the bus driver: * Catch the slave interrupts and send appropriate i2c_slave_events to the backend. +Note that most hardware supports being master _and_ slave on the same bus. So, +if you extend a bus driver, please make sure that the driver supports that as +well. In almost all cases, slave support does not need to disable the master +functionality. + Check the i2c-rcar driver as an example. -- cgit From 664d58bf4d3406dc4404e29bcb8c89fd22589d57 Mon Sep 17 00:00:00 2001 From: Zhuo-hao Lee Date: Sat, 27 Aug 2016 15:39:30 +0800 Subject: i2c: designware: save the preset value of DW_IC_SDA_HOLD There are several ways to set the SDA hold time for i2c controller, including: Device Tree, built-in device properties and ACPI. However, if the SDA hold time is not specified by above method, we should read the value, where it is preset by firmware, and save it to sda_hold_time. This is needed because when i2c controller enters runtime suspend, the DW_IC_SDA_HOLD value will be reset to chipset default value. And during runtime resume, i2c_dw_init will be called to reconfigure i2c controller. If sda_hold_time is zero, the chipset default hold time will be used, that will be too short for some platforms. Therefore, to have a better tolerance, the DW_IC_SDA_HOLD value should be kept by sda_hold_time. Signed-off-by: Zhuo-hao Lee Reviewed-by: Andy Shevchenko Acked-by: Jarkko Nikula Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-designware-core.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index c6922b806fb7..fcd973d5131e 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -367,13 +367,17 @@ int i2c_dw_init(struct dw_i2c_dev *dev) dev_dbg(dev->dev, "Fast-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt); /* Configure SDA Hold Time if required */ - if (dev->sda_hold_time) { - reg = dw_readl(dev, DW_IC_COMP_VERSION); - if (reg >= DW_IC_SDA_HOLD_MIN_VERS) + reg = dw_readl(dev, DW_IC_COMP_VERSION); + if (reg >= DW_IC_SDA_HOLD_MIN_VERS) { + if (dev->sda_hold_time) { dw_writel(dev, dev->sda_hold_time, DW_IC_SDA_HOLD); - else - dev_warn(dev->dev, - "Hardware too old to adjust SDA hold time."); + } else { + /* Keep previous hold time setting if no one set it */ + dev->sda_hold_time = dw_readl(dev, DW_IC_SDA_HOLD); + } + } else { + dev_warn(dev->dev, + "Hardware too old to adjust SDA hold time.\n"); } /* Configure Tx/Rx FIFO threshold levels */ -- cgit From e0603c8dd298171bd64227c65c6bbd6a861e1a78 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Wed, 31 Aug 2016 11:38:48 +0200 Subject: i2c: Spelling s/acknowedge/acknowledge/ Signed-off-by: Geert Uytterhoeven Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-cadence.c | 2 +- drivers/i2c/busses/i2c-rk3x.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c index 90bbd9f9dd8f..3c16a2f7c673 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -767,7 +767,7 @@ static int cdns_i2c_setclk(unsigned long clk_in, struct cdns_i2c *id) * depending on the scaling direction. * * Return: NOTIFY_STOP if the rate change should be aborted, NOTIFY_OK - * to acknowedge the change, NOTIFY_DONE if the notification is + * to acknowledge the change, NOTIFY_DONE if the notification is * considered irrelevant. */ static int cdns_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 2bc8b01153d6..dce1abd43c7f 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -918,7 +918,7 @@ static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate) * Code adapted from i2c-cadence.c. * * Return: NOTIFY_STOP if the rate change should be aborted, NOTIFY_OK - * to acknowedge the change, NOTIFY_DONE if the notification is + * to acknowledge the change, NOTIFY_DONE if the notification is * considered irrelevant. */ static int rk3x_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long -- cgit From cbfff439c54f37fc363b1d365183fa61af43585c Mon Sep 17 00:00:00 2001 From: Doug Anderson Date: Mon, 29 Aug 2016 14:22:36 -0700 Subject: i2c: rk3x: Restore clock settings at resume time Depending on a number of factors including: - Which exact Rockchip SoC we're working with - How deep we suspend - Which i2c port we're on We might lose the state of the i2c registers at suspend time. Specifically we've found that on rk3399 the i2c ports that are not in the PMU power domain lose their state with the current suspend depth configured by ARM Tursted Firmware. Note that there are very few actual i2c registers that aren't configured per transfer anyway so all we actually need to re-configure are the clock config registers. We'll just add a call to rk3x_i2c_adapt_div() at resume time and be done with it. NOTE: On rk3399 on ports whose power was lost, I put printouts in at resume time. I saw things like: before: con=0x00010300, div=0x00060006 after: con=0x00010200, div=0x00180025 Signed-off-by: Douglas Anderson Reviewed-by: David Wu Tested-by: David Wu [wsa: removed duplicate const] Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rk3x.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index dce1abd43c7f..5c5b7cada8be 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -1111,6 +1111,15 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap, return ret < 0 ? ret : num; } +static __maybe_unused int rk3x_i2c_resume(struct device *dev) +{ + struct rk3x_i2c *i2c = dev_get_drvdata(dev); + + rk3x_i2c_adapt_div(i2c, clk_get_rate(i2c->clk)); + + return 0; +} + static u32 rk3x_i2c_func(struct i2c_adapter *adap) { return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING; @@ -1334,12 +1343,15 @@ static int rk3x_i2c_remove(struct platform_device *pdev) return 0; } +static SIMPLE_DEV_PM_OPS(rk3x_i2c_pm_ops, NULL, rk3x_i2c_resume); + static struct platform_driver rk3x_i2c_driver = { .probe = rk3x_i2c_probe, .remove = rk3x_i2c_remove, .driver = { .name = "rk3x-i2c", .of_match_table = rk3x_i2c_match, + .pm = &rk3x_i2c_pm_ops, }, }; -- cgit