drm/i915: Tidy dvo_ch7017 and print out which chip we detect

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/dvo_ch7017.c b/drivers/gpu/drm/i915/dvo_ch7017.c
index 0bc8ce1..af70337 100644 (file)
--- a/drivers/gpu/drm/i915/dvo_ch7017.c
+++ b/drivers/gpu/drm/i915/dvo_ch7017.c
@@ -165,56 +165,35 @@ struct ch7017_priv {
 static void ch7017_dump_regs(struct intel_dvo_device *dvo);
 static void ch7017_dpms(struct intel_dvo_device *dvo, int mode);
 
-static bool ch7017_read(struct intel_dvo_device *dvo, int addr, uint8_t *val)
+static bool ch7017_read(struct intel_dvo_device *dvo, u8 addr, u8 *val)
 {
-       struct i2c_adapter *adapter = dvo->i2c_bus;
-       u8 out_buf[2];
-       u8 in_buf[2];
-
        struct i2c_msg msgs[] = {
                {
                        .addr = dvo->slave_addr,
                        .flags = 0,
                        .len = 1,
-                       .buf = out_buf,
+                       .buf = &addr,
                },
                {
                        .addr = dvo->slave_addr,
                        .flags = I2C_M_RD,
                        .len = 1,
-                       .buf = in_buf,
+                       .buf = val,
                }
        };
-
-       out_buf[0] = addr;
-       out_buf[1] = 0;
-
-       if (i2c_transfer(adapter, msgs, 2) == 2) {
-               *val= in_buf[0];
-               return true;
-       };
-
-       return false;
+       return i2c_transfer(dvo->i2c_bus, msgs, 2) == 2;
 }
 
-static bool ch7017_write(struct intel_dvo_device *dvo, int addr, uint8_t val)
+static bool ch7017_write(struct intel_dvo_device *dvo, u8 addr, u8 val)
 {
-       struct i2c_adapter *adapter = dvo->i2c_bus;
-       uint8_t out_buf[2];
+       uint8_t buf[2] = { addr, val };
        struct i2c_msg msg = {
                .addr = dvo->slave_addr,
                .flags = 0,
                .len = 2,
-               .buf = out_buf,
+               .buf = buf,
        };
-
-       out_buf[0] = addr;
-       out_buf[1] = val;
-
-       if (i2c_transfer(adapter, &msg, 1) == 1)
-               return true;
-
-       return false;
+       return i2c_transfer(dvo->i2c_bus, &msg, 1) == 1;
 }
 
 /** Probes for a CH7017 on the given bus and slave address. */
@@ -222,7 +201,8 @@ static bool ch7017_init(struct intel_dvo_device *dvo,
                        struct i2c_adapter *adapter)
 {
        struct ch7017_priv *priv;
-       uint8_t val;
+       const char *str;
+       u8 val;
 
        priv = kzalloc(sizeof(struct ch7017_priv), GFP_KERNEL);
        if (priv == NULL)
@@ -234,16 +214,27 @@ static bool ch7017_init(struct intel_dvo_device *dvo,
        if (!ch7017_read(dvo, CH7017_DEVICE_ID, &val))
                goto fail;
 
-       if (val != CH7017_DEVICE_ID_VALUE &&
-           val != CH7018_DEVICE_ID_VALUE &&
-           val != CH7019_DEVICE_ID_VALUE) {
+       switch (val) {
+       case CH7017_DEVICE_ID_VALUE:
+               str = "ch7017";
+               break;
+       case CH7018_DEVICE_ID_VALUE:
+               str = "ch7018";
+               break;
+       case CH7019_DEVICE_ID_VALUE:
+               str = "ch7019";
+               break;
+       default:
                DRM_DEBUG_KMS("ch701x not detected, got %d: from %s "
-                               "Slave %d.\n",
-                         val, adapter->name,dvo->slave_addr);
+                             "slave %d.\n",
+                             val, adapter->name,dvo->slave_addr);
                goto fail;
        }
 
+       DRM_DEBUG_KMS("%s detected on %s, addr %d\n",
+                     str, adapter->name, dvo->slave_addr);
        return true;
+
 fail:
        kfree(priv);
        return false;
@@ -365,7 +356,7 @@ static void ch7017_dpms(struct intel_dvo_device *dvo, int mode)
        }
 
        /* XXX: Should actually wait for update power status somehow */
-       udelay(20000);
+       msleep(20);
 }
 
 static void ch7017_dump_regs(struct intel_dvo_device *dvo)