mirror of https://gitee.com/openkylin/linux.git
drm/i915: support address only i2c-over-aux transactions
To support bare address requests used by the drm dp helpers. Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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@ -575,7 +575,8 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
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return ret;
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}
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#define HEADER_SIZE 4
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#define BARE_ADDRESS_SIZE 3
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#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
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static ssize_t
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intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
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{
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@ -592,7 +593,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
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switch (msg->request & ~DP_AUX_I2C_MOT) {
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case DP_AUX_NATIVE_WRITE:
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case DP_AUX_I2C_WRITE:
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txsize = HEADER_SIZE + msg->size;
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txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
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rxsize = 1;
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if (WARN_ON(txsize > 20))
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@ -611,7 +612,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
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case DP_AUX_NATIVE_READ:
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case DP_AUX_I2C_READ:
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txsize = HEADER_SIZE;
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txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
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rxsize = msg->size + 1;
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if (WARN_ON(rxsize > 20))
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