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drm/i915/intel_i2c: use INDEX cycles for i2c read transactions
It is very common for an i2c device to require a small 1 or 2 byte write followed by a read. For example, when reading from an i2c EEPROM it is common to write and address, offset or index followed by a reading some values. The i915 gmbus controller provides a special "INDEX" cycle for performing such a small write followed by a read. The INDEX can be either one or two bytes long. The advantage of using such a cycle is that the CPU has slightly less work to do once the read with INDEX cycle is started. Signed-off-by: Daniel Kurtz <[email protected]> Reviewed-by: Chris Wilson <[email protected]> Signed-off-by: Daniel Vetter <[email protected]>
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