[PATCH 7/8 v7] drm/i915/intel_i2c: remove POSTING_READ() from gmbus transfers

Daniel Kurtz
2012-03-30T11:54:17Z

The POSTING_READ() calls were originally added to make sure the writes
were flushed before any timing delays and across loops.
Now that the code has settled a bit, let's remove them.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
---
drivers/gpu/drm/i915/intel_i2c.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 60f90cb..73431ed 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -217,7 +217,6 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
(len << GMBUS_BYTE_COUNT_SHIFT) |
(msg->addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_READ | GMBUS_SW_RDY);
- POSTING_READ(GMBUS2 + reg_offset);
do {
int ret;
u32 val, loop = 0;
@@ -261,7 +260,6 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
(msg->len << GMBUS_BYTE_COUNT_SHIFT) |
(msg->addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
- POSTING_READ(GMBUS2 + reg_offset);
while (len) {
int ret;
u32 gmbus2;
@@ -272,7 +270,6 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
} while (--len && ++loop < 4);

I915_WRITE(GMBUS3 + reg_offset, val);
- POSTING_READ(GMBUS2 + reg_offset);

ret = wait_for((gmbus2 = I915_READ(GMBUS2 + reg_offset)) &
(GMBUS_SATOER | GMBUS_HW_RDY),
--
1.7.7.3