drm/i915: Don't try indexed reads to alternate slave addresses
We can only specify the one slave address to indexed reads/writes.
Make sure the messages we check are destined to the same slave
address before deciding to do an indexed transfer.
Cc: stable@vger.kernel.org
Cc: Daniel Kurtz <djkurtz@chromium.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sean Paul <seanpaul@chromium.org>
Fixes: 56f9eac054
("drm/i915/intel_i2c: use INDEX cycles for i2c read transactions")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171123194157.25367-2-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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@ -438,6 +438,7 @@ static bool
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gmbus_is_index_read(struct i2c_msg *msgs, int i, int num)
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{
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return (i + 1 < num &&
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msgs[i].addr == msgs[i + 1].addr &&
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!(msgs[i].flags & I2C_M_RD) && msgs[i].len <= 2 &&
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(msgs[i + 1].flags & I2C_M_RD));
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}
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