drm/radeon/kms: use new pre/post_xfer i2c bit algo hooks

This allows us to remove the internal bit algo bus used by
the radeon i2c algo.  We now register a radeon algo adapter
if the gpio line is hw capable and the hw inplementation is
available, otherwise we register a bit algo adapter.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 64 insertions, 79 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index ee0083f982d8..60d59816b94f 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -940,7 +940,7 @@ static void radeon_dp_connector_destroy(struct drm_connector *connector)
         if (radeon_connector->edid)
                 kfree(radeon_connector->edid);
         if (radeon_dig_connector->dp_i2c_bus)
-                radeon_i2c_destroy_dp(radeon_dig_connector->dp_i2c_bus);
+                radeon_i2c_destroy(radeon_dig_connector->dp_i2c_bus);
         kfree(radeon_connector->con_priv);
         drm_sysfs_connector_remove(connector);
         drm_connector_cleanup(connector);
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index f007fcb1191b..352110fd68f6 100644
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -59,6 +59,7 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
         return false;
 }
 
+/* bit banging i2c */
 
 static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
 {
@@ -181,6 +182,24 @@ static void set_data(void *i2c_priv, int data)
         WREG32(rec->en_data_reg, val);
 }
 
+static int pre_xfer(struct i2c_adapter *i2c_adap)
+{
+        struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+
+        radeon_i2c_do_lock(i2c, 1);
+
+        return 0;
+}
+
+static void post_xfer(struct i2c_adapter *i2c_adap)
+{
+        struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+
+        radeon_i2c_do_lock(i2c, 0);
+}
+
+/* hw i2c */
+
 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
 {
         u32 sclk = radeon_get_engine_clock(rdev);
@@ -757,26 +776,13 @@ done:
         return ret;
 }
 
-static int radeon_sw_i2c_xfer(struct i2c_adapter *i2c_adap,
+static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
                               struct i2c_msg *msgs, int num)
 {
         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
-        int ret;
-
-        radeon_i2c_do_lock(i2c, 1);
-        ret = i2c_transfer(&i2c->algo.radeon.bit_adapter, msgs, num);
-        radeon_i2c_do_lock(i2c, 0);
-
-        return ret;
-}
-
-static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
-                           struct i2c_msg *msgs, int num)
-{
-        struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
         struct radeon_device *rdev = i2c->dev->dev_private;
         struct radeon_i2c_bus_rec *rec = &i2c->rec;
-        int ret;
+        int ret = 0;
 
         switch (rdev->family) {
         case CHIP_R100:
@@ -797,16 +803,12 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
         case CHIP_RV410:
         case CHIP_RS400:
         case CHIP_RS480:
-                if (rec->hw_capable)
-                        ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
-                else
-                        ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+                ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         case CHIP_RS600:
         case CHIP_RS690:
         case CHIP_RS740:
                 /* XXX fill in hw i2c implementation */
-                ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         case CHIP_RV515:
         case CHIP_R520:
@@ -814,20 +816,16 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
         case CHIP_RV560:
         case CHIP_RV570:
         case CHIP_R580:
-                if (rec->hw_capable) {
-                        if (rec->mm_i2c)
-                                ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
-                        else
-                                ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
-                } else
-                        ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+                if (rec->mm_i2c)
+                        ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
+                else
+                        ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         case CHIP_R600:
         case CHIP_RV610:
         case CHIP_RV630:
         case CHIP_RV670:
                 /* XXX fill in hw i2c implementation */
-                ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         case CHIP_RV620:
         case CHIP_RV635:
@@ -838,7 +836,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
         case CHIP_RV710:
         case CHIP_RV740:
                 /* XXX fill in hw i2c implementation */
-                ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         case CHIP_CEDAR:
         case CHIP_REDWOOD:
@@ -846,7 +843,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
         case CHIP_CYPRESS:
         case CHIP_HEMLOCK:
                 /* XXX fill in hw i2c implementation */
-                ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
                 break;
         default:
                 DRM_ERROR("i2c: unhandled radeon chip\n");
@@ -857,20 +853,21 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
         return ret;
 }
 
-static u32 radeon_i2c_func(struct i2c_adapter *adap)
+static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
 {
         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 }
 
 static const struct i2c_algorithm radeon_i2c_algo = {
-        .master_xfer = radeon_i2c_xfer,
-        .functionality = radeon_i2c_func,
+        .master_xfer = radeon_hw_i2c_xfer,
+        .functionality = radeon_hw_i2c_func,
 };
 
 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
                                           struct radeon_i2c_bus_rec *rec,
                                           const char *name)
 {
+        struct radeon_device *rdev = dev->dev_private;
         struct radeon_i2c_chan *i2c;
         int ret;
 
@@ -878,37 +875,41 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
         if (i2c == NULL)
                 return NULL;
 
-        /* set the internal bit adapter */
-        i2c->algo.radeon.bit_adapter.owner = THIS_MODULE;
-        i2c_set_adapdata(&i2c->algo.radeon.bit_adapter, i2c);
-        sprintf(i2c->algo.radeon.bit_adapter.name, "Radeon internal i2c bit bus %s", name);
-        i2c->algo.radeon.bit_adapter.algo_data = &i2c->algo.radeon.bit_data;
-        i2c->algo.radeon.bit_data.setsda = set_data;
-        i2c->algo.radeon.bit_data.setscl = set_clock;
-        i2c->algo.radeon.bit_data.getsda = get_data;
-        i2c->algo.radeon.bit_data.getscl = get_clock;
-        i2c->algo.radeon.bit_data.udelay = 20;
-        /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
-         * make this, 2 jiffies is a lot more reliable */
-        i2c->algo.radeon.bit_data.timeout = 2;
-        i2c->algo.radeon.bit_data.data = i2c;
-        ret = i2c_bit_add_bus(&i2c->algo.radeon.bit_adapter);
-        if (ret) {
-                DRM_ERROR("Failed to register internal bit i2c %s\n", name);
-                goto out_free;
-        }
-        /* set the radeon i2c adapter */
-        i2c->dev = dev;
         i2c->rec = *rec;
         i2c->adapter.owner = THIS_MODULE;
+        i2c->dev = dev;
         i2c_set_adapdata(&i2c->adapter, i2c);
-        sprintf(i2c->adapter.name, "Radeon i2c %s", name);
-        i2c->adapter.algo_data = &i2c->algo.radeon;
-        i2c->adapter.algo = &radeon_i2c_algo;
-        ret = i2c_add_adapter(&i2c->adapter);
-        if (ret) {
-                DRM_ERROR("Failed to register i2c %s\n", name);
-                goto out_free;
+        if (rec->hw_capable &&
+            ((rdev->family <= CHIP_RS480) ||
+             ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580)))) {
+                /* set the radeon hw i2c adapter */
+                sprintf(i2c->adapter.name, "Radeon i2c hw bus %s", name);
+                i2c->adapter.algo = &radeon_i2c_algo;
+                ret = i2c_add_adapter(&i2c->adapter);
+                if (ret) {
+                        DRM_ERROR("Failed to register hw i2c %s\n", name);
+                        goto out_free;
+                }
+        } else {
+                /* set the radeon bit adapter */
+                sprintf(i2c->adapter.name, "Radeon i2c bit bus %s", name);
+                i2c->adapter.algo_data = &i2c->algo.bit;
+                i2c->algo.bit.pre_xfer = pre_xfer;
+                i2c->algo.bit.post_xfer = post_xfer;
+                i2c->algo.bit.setsda = set_data;
+                i2c->algo.bit.setscl = set_clock;
+                i2c->algo.bit.getsda = get_data;
+                i2c->algo.bit.getscl = get_clock;
+                i2c->algo.bit.udelay = 20;
+                /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
+                 * make this, 2 jiffies is a lot more reliable */
+                i2c->algo.bit.timeout = 2;
+                i2c->algo.bit.data = i2c;
+                ret = i2c_bit_add_bus(&i2c->adapter);
+                if (ret) {
+                        DRM_ERROR("Failed to register bit i2c %s\n", name);
+                        goto out_free;
+                }
         }
 
         return i2c;
@@ -953,16 +954,6 @@ void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 {
         if (!i2c)
                 return;
-        i2c_del_adapter(&i2c->algo.radeon.bit_adapter);
-        i2c_del_adapter(&i2c->adapter);
-        kfree(i2c);
-}
-
-void radeon_i2c_destroy_dp(struct radeon_i2c_chan *i2c)
-{
-        if (!i2c)
-                return;
-
         i2c_del_adapter(&i2c->adapter);
         kfree(i2c);
 }
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 55a41757eed1..0b8e32776b10 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -173,17 +173,12 @@ struct radeon_pll {
         enum radeon_pll_algo algo;
 };
 
-struct i2c_algo_radeon_data {
-        struct i2c_adapter bit_adapter;
-        struct i2c_algo_bit_data bit_data;
-};
-
 struct radeon_i2c_chan {
         struct i2c_adapter adapter;
         struct drm_device *dev;
         union {
+                struct i2c_algo_bit_data bit;
                 struct i2c_algo_dp_aux_data dp;
-                struct i2c_algo_radeon_data radeon;
         } algo;
         struct radeon_i2c_bus_rec rec;
 };
@@ -435,7 +430,6 @@ extern struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
                                                  struct radeon_i2c_bus_rec *rec,
                                                  const char *name);
 extern void radeon_i2c_destroy(struct radeon_i2c_chan *i2c);
-extern void radeon_i2c_destroy_dp(struct radeon_i2c_chan *i2c);
 extern void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
                                 u8 slave_addr,
                                 u8 addr,