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drm/i915/intel_i2c: remove POSTING_READ() from gmbus transfers 

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>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Kurtz 2012-03-30 19:46:42 +08:00 committed by Daniel Vetter
parent 90e6b26d6b
commit e2ba4fb313
1 changed files with 0 additions and 3 deletions
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3
drivers/gpu/drm/i915/intel_i2c.c
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@ -217,7 +217,6 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
(len << GMBUS_BYTE_COUNT_SHIFT) | (len << GMBUS_BYTE_COUNT_SHIFT) |
(msg->addr << GMBUS_SLAVE_ADDR_SHIFT) | (msg->addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_READ | GMBUS_SW_RDY); GMBUS_SLAVE_READ | GMBUS_SW_RDY);
POSTING_READ(GMBUS2 + reg_offset);
do { do {
int ret; int ret;
u32 val, loop = 0; 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->len << GMBUS_BYTE_COUNT_SHIFT) |
(msg->addr << GMBUS_SLAVE_ADDR_SHIFT) | (msg->addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_WRITE | GMBUS_SW_RDY); GMBUS_SLAVE_WRITE | GMBUS_SW_RDY);
POSTING_READ(GMBUS2 + reg_offset);
while (len) { while (len) {
int ret; int ret;
u32 gmbus2; u32 gmbus2;
@ -272,7 +270,6 @@ gmbus_xfer_write(struct drm_i915_private *dev_priv, struct i2c_msg *msg)
} while (--len && ++loop < 4); } while (--len && ++loop < 4);
I915_WRITE(GMBUS3 + reg_offset, val); I915_WRITE(GMBUS3 + reg_offset, val);
POSTING_READ(GMBUS2 + reg_offset);
ret = wait_for((gmbus2 = I915_READ(GMBUS2 + reg_offset)) & ret = wait_for((gmbus2 = I915_READ(GMBUS2 + reg_offset)) &
(GMBUS_SATOER | GMBUS_HW_RDY), (GMBUS_SATOER | GMBUS_HW_RDY),