[PATCH v2] drm/i915/dp: make intel_dp_aux_native_read() return bool

[Jani Nikula <jani.nikula@intel.com>]

In most cases we only care about success or fail, so make the function
easier to use, and consistent with intel_dp_aux_native_read_retry().

This fixes the intel_dp_aux_native_read() usage in intel_dp_sink_crc()
which has already assumed bool, and would only have caught very specific
failure modes.

v2: simplify intel_dp_aux_native_read_retry() while at it. (Chris)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0ef2690..8c61fce 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -613,8 +613,8 @@ intel_dp_aux_native_write_1(struct intel_dp *intel_dp,
 
 /* read bytes from a native aux channel */
 static int
-intel_dp_aux_native_read(struct intel_dp *intel_dp,
-			 uint16_t address, uint8_t *recv, int recv_bytes)
+_intel_dp_aux_native_read(struct intel_dp *intel_dp,
+			  uint16_t address, uint8_t *recv, int recv_bytes)
 {
 	uint8_t msg[4];
 	int msg_bytes;
@@ -654,6 +654,14 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
 	}
 }
 
+static inline bool
+intel_dp_aux_native_read(struct intel_dp *intel_dp,
+			 uint16_t address, uint8_t *recv, int recv_bytes)
+{
+	return _intel_dp_aux_native_read(intel_dp, address,
+					 recv, recv_bytes) == recv_bytes;
+}
+
 static int
 intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 		    uint8_t write_byte, uint8_t *read_byte)
@@ -1979,16 +1987,15 @@ static bool
 intel_dp_aux_native_read_retry(struct intel_dp *intel_dp, uint16_t address,
 			       uint8_t *recv, int recv_bytes)
 {
-	int ret, i;
+	int i;
 
 	/*
 	 * Sinks are *supposed* to come up within 1ms from an off state,
 	 * but we're also supposed to retry 3 times per the spec.
 	 */
 	for (i = 0; i < 3; i++) {
-		ret = intel_dp_aux_native_read(intel_dp, address, recv,
-					       recv_bytes);
-		if (ret == recv_bytes)
+		if (intel_dp_aux_native_read(intel_dp, address, recv,
+					     recv_bytes))
 			return true;
 		msleep(1);
 	}
-- 
1.7.10.4