drm/radeon/dp: use usleep_range rather than udelay

Based on common dp code proposed by Thierry Reding.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 149e09a..403ca00 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -172,7 +172,7 @@ static int radeon_dp_aux_native_write(struct radeon_connector *radeon_connector,
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
                        return send_bytes;
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
-                       udelay(400);
+                       usleep_range(400, 500);
                else
                        return -EIO;
        }
@@ -206,7 +206,7 @@ static int radeon_dp_aux_native_read(struct radeon_connector *radeon_connector,
                if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_ACK)
                        return ret;
                else if ((ack & DP_AUX_NATIVE_REPLY_MASK) == DP_AUX_NATIVE_REPLY_DEFER)
-                       udelay(400);
+                       usleep_range(400, 500);
                else if (ret == 0)
                        return -EPROTO;
                else
@@ -295,7 +295,7 @@ int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
                        return -EREMOTEIO;
                case DP_AUX_NATIVE_REPLY_DEFER:
                        DRM_DEBUG_KMS("aux_ch native defer\n");
-                       udelay(400);
+                       usleep_range(500, 600);
                        continue;
                default:
                        DRM_ERROR("aux_ch invalid native reply 0x%02x\n", ack);
@@ -312,7 +312,7 @@ int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
                        return -EREMOTEIO;
                case DP_AUX_I2C_REPLY_DEFER:
                        DRM_DEBUG_KMS("aux_i2c defer\n");
-                       udelay(400);
+                       usleep_range(400, 500);
                        break;
                default:
                        DRM_ERROR("aux_i2c invalid reply 0x%02x\n", ack);