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path: root/drivers/gpu/drm/i915/intel_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
-rw-r--r--drivers/gpu/drm/i915/intel_i2c.c54
1 files changed, 23 insertions, 31 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index a64f26c670af..1369fc41d039 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -114,8 +114,8 @@ intel_i2c_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- I915_WRITE(dev_priv->gpio_mmio_base + GMBUS0, 0);
- I915_WRITE(dev_priv->gpio_mmio_base + GMBUS4, 0);
+ I915_WRITE(GMBUS0, 0);
+ I915_WRITE(GMBUS4, 0);
}
static void intel_i2c_quirk_set(struct drm_i915_private *dev_priv, bool enable)
@@ -261,7 +261,6 @@ gmbus_wait_hw_status(struct drm_i915_private *dev_priv,
u32 gmbus4_irq_en)
{
int i;
- int reg_offset = dev_priv->gpio_mmio_base;
u32 gmbus2 = 0;
DEFINE_WAIT(wait);
@@ -271,13 +270,13 @@ gmbus_wait_hw_status(struct drm_i915_private *dev_priv,
/* Important: The hw handles only the first bit, so set only one! Since
* we also need to check for NAKs besides the hw ready/idle signal, we
* need to wake up periodically and check that ourselves. */
- I915_WRITE(GMBUS4 + reg_offset, gmbus4_irq_en);
+ I915_WRITE(GMBUS4, gmbus4_irq_en);
for (i = 0; i < msecs_to_jiffies_timeout(50); i++) {
prepare_to_wait(&dev_priv->gmbus_wait_queue, &wait,
TASK_UNINTERRUPTIBLE);
- gmbus2 = I915_READ_NOTRACE(GMBUS2 + reg_offset);
+ gmbus2 = I915_READ_NOTRACE(GMBUS2);
if (gmbus2 & (GMBUS_SATOER | gmbus2_status))
break;
@@ -285,7 +284,7 @@ gmbus_wait_hw_status(struct drm_i915_private *dev_priv,
}
finish_wait(&dev_priv->gmbus_wait_queue, &wait);
- I915_WRITE(GMBUS4 + reg_offset, 0);
+ I915_WRITE(GMBUS4, 0);
if (gmbus2 & GMBUS_SATOER)
return -ENXIO;
@@ -298,20 +297,19 @@ static int
gmbus_wait_idle(struct drm_i915_private *dev_priv)
{
int ret;
- int reg_offset = dev_priv->gpio_mmio_base;
-#define C ((I915_READ_NOTRACE(GMBUS2 + reg_offset) & GMBUS_ACTIVE) == 0)
+#define C ((I915_READ_NOTRACE(GMBUS2) & GMBUS_ACTIVE) == 0)
if (!HAS_GMBUS_IRQ(dev_priv->dev))
return wait_for(C, 10);
/* Important: The hw handles only the first bit, so set only one! */
- I915_WRITE(GMBUS4 + reg_offset, GMBUS_IDLE_EN);
+ I915_WRITE(GMBUS4, GMBUS_IDLE_EN);
ret = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
msecs_to_jiffies_timeout(10));
- I915_WRITE(GMBUS4 + reg_offset, 0);
+ I915_WRITE(GMBUS4, 0);
if (ret)
return 0;
@@ -325,9 +323,7 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
unsigned short addr, u8 *buf, unsigned int len,
u32 gmbus1_index)
{
- int reg_offset = dev_priv->gpio_mmio_base;
-
- I915_WRITE(GMBUS1 + reg_offset,
+ I915_WRITE(GMBUS1,
gmbus1_index |
GMBUS_CYCLE_WAIT |
(len << GMBUS_BYTE_COUNT_SHIFT) |
@@ -342,7 +338,7 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
if (ret)
return ret;
- val = I915_READ(GMBUS3 + reg_offset);
+ val = I915_READ(GMBUS3);
do {
*buf++ = val & 0xff;
val >>= 8;
@@ -380,7 +376,6 @@ static int
gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
unsigned short addr, u8 *buf, unsigned int len)
{
- int reg_offset = dev_priv->gpio_mmio_base;
unsigned int chunk_size = len;
u32 val, loop;
@@ -390,8 +385,8 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
len -= 1;
}
- I915_WRITE(GMBUS3 + reg_offset, val);
- I915_WRITE(GMBUS1 + reg_offset,
+ I915_WRITE(GMBUS3, val);
+ I915_WRITE(GMBUS1,
GMBUS_CYCLE_WAIT |
(chunk_size << GMBUS_BYTE_COUNT_SHIFT) |
(addr << GMBUS_SLAVE_ADDR_SHIFT) |
@@ -404,7 +399,7 @@ gmbus_xfer_write_chunk(struct drm_i915_private *dev_priv,
val |= *buf++ << (8 * loop);
} while (--len && ++loop < 4);
- I915_WRITE(GMBUS3 + reg_offset, val);
+ I915_WRITE(GMBUS3, val);
ret = gmbus_wait_hw_status(dev_priv, GMBUS_HW_RDY,
GMBUS_HW_RDY_EN);
@@ -452,7 +447,6 @@ gmbus_is_index_read(struct i2c_msg *msgs, int i, int num)
static int
gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
{
- int reg_offset = dev_priv->gpio_mmio_base;
u32 gmbus1_index = 0;
u32 gmbus5 = 0;
int ret;
@@ -466,13 +460,13 @@ gmbus_xfer_index_read(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
/* GMBUS5 holds 16-bit index */
if (gmbus5)
- I915_WRITE(GMBUS5 + reg_offset, gmbus5);
+ I915_WRITE(GMBUS5, gmbus5);
ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
/* Clear GMBUS5 after each index transfer */
if (gmbus5)
- I915_WRITE(GMBUS5 + reg_offset, 0);
+ I915_WRITE(GMBUS5, 0);
return ret;
}
@@ -486,7 +480,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
struct intel_gmbus,
adapter);
struct drm_i915_private *dev_priv = bus->dev_priv;
- int i = 0, inc, try = 0, reg_offset;
+ int i = 0, inc, try = 0;
int ret = 0;
intel_aux_display_runtime_get(dev_priv);
@@ -497,10 +491,8 @@ gmbus_xfer(struct i2c_adapter *adapter,
goto out;
}
- reg_offset = dev_priv->gpio_mmio_base;
-
retry:
- I915_WRITE(GMBUS0 + reg_offset, bus->reg0);
+ I915_WRITE(GMBUS0, bus->reg0);
for (; i < num; i += inc) {
inc = 1;
@@ -530,7 +522,7 @@ retry:
* a STOP on the very first cycle. To simplify the code we
* unconditionally generate the STOP condition with an additional gmbus
* cycle. */
- I915_WRITE(GMBUS1 + reg_offset, GMBUS_CYCLE_STOP | GMBUS_SW_RDY);
+ I915_WRITE(GMBUS1, GMBUS_CYCLE_STOP | GMBUS_SW_RDY);
/* Mark the GMBUS interface as disabled after waiting for idle.
* We will re-enable it at the start of the next xfer,
@@ -541,7 +533,7 @@ retry:
adapter->name);
ret = -ETIMEDOUT;
}
- I915_WRITE(GMBUS0 + reg_offset, 0);
+ I915_WRITE(GMBUS0, 0);
ret = ret ?: i;
goto out;
@@ -570,9 +562,9 @@ clear_err:
* of resetting the GMBUS controller and so clearing the
* BUS_ERROR raised by the slave's NAK.
*/
- I915_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT);
- I915_WRITE(GMBUS1 + reg_offset, 0);
- I915_WRITE(GMBUS0 + reg_offset, 0);
+ I915_WRITE(GMBUS1, GMBUS_SW_CLR_INT);
+ I915_WRITE(GMBUS1, 0);
+ I915_WRITE(GMBUS0, 0);
DRM_DEBUG_KMS("GMBUS [%s] NAK for addr: %04x %c(%d)\n",
adapter->name, msgs[i].addr,
@@ -595,7 +587,7 @@ clear_err:
timeout:
DRM_INFO("GMBUS [%s] timed out, falling back to bit banging on pin %d\n",
bus->adapter.name, bus->reg0 & 0xff);
- I915_WRITE(GMBUS0 + reg_offset, 0);
+ I915_WRITE(GMBUS0, 0);
/* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */
bus->force_bit = 1;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.