drm/i915: Fix channel ending action for DP aux transaction

We should use current channel 'status' bits to clear DP aux channel's
done and error bits, instead of using the channel setting bits, that
will set send/busy bit again to initiate new transaction.

This also includes also some minor cleanup.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6770ae88370d6de67c437e918f559c20ddf70e48..afec65c5ad8a6256969b37474f27d08508652ede 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -236,7 +236,7 @@ intel_dp_aux_ch(struct intel_output *intel_output,
                }
        
                /* Clear done status and any errors */
-               I915_WRITE(ch_ctl, (ctl |
+               I915_WRITE(ch_ctl, (status |
                                DP_AUX_CH_CTL_DONE |
                                DP_AUX_CH_CTL_TIME_OUT_ERROR |
                                DP_AUX_CH_CTL_RECEIVE_ERROR));
@@ -295,7 +295,7 @@ intel_dp_aux_native_write(struct intel_output *intel_output,
                return -1;
        msg[0] = AUX_NATIVE_WRITE << 4;
        msg[1] = address >> 8;
-       msg[2] = address;
+       msg[2] = address & 0xff;
        msg[3] = send_bytes - 1;
        memcpy(&msg[4], send, send_bytes);
        msg_bytes = send_bytes + 4;
@@ -387,8 +387,8 @@ intel_dp_i2c_init(struct intel_output *intel_output, const char *name)
        memset(&dp_priv->adapter, '\0', sizeof (dp_priv->adapter));
        dp_priv->adapter.owner = THIS_MODULE;
        dp_priv->adapter.class = I2C_CLASS_DDC;
-       strncpy (dp_priv->adapter.name, name, sizeof dp_priv->adapter.name - 1);
-       dp_priv->adapter.name[sizeof dp_priv->adapter.name - 1] = '\0';
+       strncpy (dp_priv->adapter.name, name, sizeof(dp_priv->adapter.name) - 1);
+       dp_priv->adapter.name[sizeof(dp_priv->adapter.name) - 1] = '\0';
        dp_priv->adapter.algo_data = &dp_priv->algo;
        dp_priv->adapter.dev.parent = &intel_output->base.kdev;