Merge branch 'drm-fixes-3.7' of git://people.freedesktop.org/~agd5f/linux

[karo-tx-linux.git] / drivers / i2c / busses / i2c-omap.c

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index db31eaed6ea59b32083df49f757c1fc949c60303..3525c9e62cb0f9bf23f47705fd86d3bba9707b45 100644 (file)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -43,7 +43,6 @@
 #include <linux/slab.h>
 #include <linux/i2c-omap.h>
 #include <linux/pm_runtime.h>
-#include <linux/pm_qos.h>
 
 /* I2C controller revisions */
 #define OMAP_I2C_OMAP1_REV_2           0x20
@@ -187,8 +186,9 @@ struct omap_i2c_dev {
        int                     reg_shift;      /* bit shift for I2C register addresses */
        struct completion       cmd_complete;
        struct resource         *ioarea;
-       u32                     latency;        /* maximum MPU wkup latency */
-       struct pm_qos_request   pm_qos_request;
+       u32                     latency;        /* maximum mpu wkup latency */
+       void                    (*set_mpu_wkup_lat)(struct device *dev,
+                                                   long latency);
        u32                     speed;          /* Speed of bus in kHz */
        u32                     dtrev;          /* extra revision from DT */
        u32                     flags;
@@ -494,7 +494,9 @@ static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx)
                dev->b_hw = 1; /* Enable hardware fixes */
 
        /* calculate wakeup latency constraint for MPU */
-       dev->latency = (1000000 * dev->threshold) / (1000 * dev->speed / 8);
+       if (dev->set_mpu_wkup_lat != NULL)
+               dev->latency = (1000000 * dev->threshold) /
+                       (1000 * dev->speed / 8);
 }
 
 /*
@@ -522,6 +524,9 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
        dev->buf = msg->buf;
        dev->buf_len = msg->len;
 
+       /* make sure writes to dev->buf_len are ordered */
+       barrier();
+
        omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
 
        /* Clear the FIFO Buffers */
@@ -579,7 +584,6 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
         */
        timeout = wait_for_completion_timeout(&dev->cmd_complete,
                                                OMAP_I2C_TIMEOUT);
-       dev->buf_len = 0;
        if (timeout == 0) {
                dev_err(dev->dev, "controller timed out\n");
                omap_i2c_init(dev);
@@ -629,16 +633,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
        if (r < 0)
                goto out;
 
-       /*
-        * When waiting for completion of a i2c transfer, we need to
-        * set a wake up latency constraint for the MPU. This is to
-        * ensure quick enough wakeup from idle, when transfer
-        * completes.
-        */
-       if (dev->latency)
-               pm_qos_add_request(&dev->pm_qos_request,
-                                  PM_QOS_CPU_DMA_LATENCY,
-                                  dev->latency);
+       if (dev->set_mpu_wkup_lat != NULL)
+               dev->set_mpu_wkup_lat(dev->dev, dev->latency);
 
        for (i = 0; i < num; i++) {
                r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
@@ -646,8 +642,8 @@ omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
                        break;
        }
 
-       if (dev->latency)
-               pm_qos_remove_request(&dev->pm_qos_request);
+       if (dev->set_mpu_wkup_lat != NULL)
+               dev->set_mpu_wkup_lat(dev->dev, -1);
 
        if (r == 0)
                r = num;
@@ -1104,6 +1100,7 @@ omap_i2c_probe(struct platform_device *pdev)
        } else if (pdata != NULL) {
                dev->speed = pdata->clkrate;
                dev->flags = pdata->flags;
+               dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat;
                dev->dtrev = pdata->rev;
        }
 
@@ -1159,8 +1156,9 @@ omap_i2c_probe(struct platform_device *pdev)
                        dev->b_hw = 1; /* Enable hardware fixes */
 
                /* calculate wakeup latency constraint for MPU */
-               dev->latency = (1000000 * dev->fifo_size) /
-                              (1000 * dev->speed / 8);
+               if (dev->set_mpu_wkup_lat != NULL)
+                       dev->latency = (1000000 * dev->fifo_size) /
+                                      (1000 * dev->speed / 8);
        }
 
        /* reset ASAP, clearing any IRQs */