[PATCH 03/10 v2] drm/i915/intel_i2c: add intel_gmbus_get_adapter

From: Daniel Kurtz
Date: Fri Mar 09 2012 - 13:48:42 EST

Instead of letting other modules directly access the ->gmbus array,
introduce a new API, intel_gmbus_get_adapter(), to lookup an i2c_adapter
for a given gmbus pin pair identifier. This API enables later refactoring
of the gmbus pin pair list.

Note: It is critical that intel_setup_gmbus() gets called before
intel_gmbus_get_adapter().

Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 4 +++-
drivers/gpu/drm/i915/intel_bios.c | 11 +++++++----
drivers/gpu/drm/i915/intel_crt.c | 13 ++++++-------
drivers/gpu/drm/i915/intel_drv.h | 3 ++-
drivers/gpu/drm/i915/intel_dvo.c | 4 ++--
drivers/gpu/drm/i915/intel_hdmi.c | 29 ++++++++++++++---------------
drivers/gpu/drm/i915/intel_i2c.c | 7 +++++++
drivers/gpu/drm/i915/intel_lvds.c | 3 ++-
drivers/gpu/drm/i915/intel_modes.c | 6 +++---
drivers/gpu/drm/i915/intel_sdvo.c | 10 ++++------
10 files changed, 50 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 9689ca3..9a81e48 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -391,7 +391,7 @@ typedef struct drm_i915_private {

struct notifier_block lid_notifier;

- int crt_ddc_pin;
+ struct i2c_adapter *crt_ddc;
struct drm_i915_fence_reg fence_regs[I915_MAX_NUM_FENCES]; /* assume 965 */
int fence_reg_start; /* 4 if userland hasn't ioctl'd us yet */
int num_fence_regs; /* 8 on pre-965, 16 otherwise */
@@ -1274,6 +1274,8 @@ extern int i915_restore_state(struct drm_device *dev);
/* intel_i2c.c */
extern int intel_setup_gmbus(struct drm_device *dev);
extern void intel_teardown_gmbus(struct drm_device *dev);
+extern struct i2c_adapter *intel_gmbus_get_adapter(
+ struct drm_i915_private *dev_priv, unsigned pin);
extern void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed);
extern void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit);
extern inline bool intel_gmbus_is_forced_bit(struct i2c_adapter *adapter)
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 63880e2..00e751f 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -330,12 +330,14 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
u16 block_size = get_blocksize(general);
if (block_size >= sizeof(*general)) {
int bus_pin = general->crt_ddc_gmbus_pin;
+ struct i2c_adapter *i2c;
DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
- if (bus_pin >= 1 && bus_pin <= 6)
- dev_priv->crt_ddc_pin = bus_pin;
+ i2c = intel_gmbus_get_adapter(dev_priv, bus_pin);
+ if (i2c)
+ dev_priv->crt_ddc = i2c;
} else {
DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
- block_size);
+ block_size);
}
}
}
@@ -599,7 +601,8 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;

- dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
+ dev_priv->crt_ddc = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_VGADDC);

/* LFP panel data */
dev_priv->lvds_dither = 1;
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index dd729d4..02f6fc1 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -275,12 +275,11 @@ static bool intel_crt_detect_ddc(struct drm_connector *connector)
if (crt->base.type != INTEL_OUTPUT_ANALOG)
return false;

- if (intel_ddc_probe(&crt->base, dev_priv->crt_ddc_pin)) {
+ if (intel_ddc_probe(&crt->base, dev_priv->crt_ddc)) {
struct edid *edid;
bool is_digital = false;

- edid = drm_get_edid(connector,
- &dev_priv->gmbus[dev_priv->crt_ddc_pin].adapter);
+ edid = drm_get_edid(connector, dev_priv->crt_ddc);
/*
* This may be a DVI-I connector with a shared DDC
* link between analog and digital outputs, so we
@@ -484,14 +483,14 @@ static int intel_crt_get_modes(struct drm_connector *connector)
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;

- ret = intel_ddc_get_modes(connector,
- &dev_priv->gmbus[dev_priv->crt_ddc_pin].adapter);
+ ret = intel_ddc_get_modes(connector, dev_priv->crt_ddc);
if (ret || !IS_G4X(dev))
return ret;

/* Try to probe digital port for output in DVI-I -> VGA mode. */
- return intel_ddc_get_modes(connector,
- &dev_priv->gmbus[GMBUS_PORT_DPB].adapter);
+ return intel_ddc_get_modes(
+ connector,
+ intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB));
}

static int intel_crt_set_property(struct drm_connector *connector,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1348705..7538f2e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -285,7 +285,8 @@ struct intel_fbc_work {
};

int intel_ddc_get_modes(struct drm_connector *c, struct i2c_adapter *adapter);
-extern bool intel_ddc_probe(struct intel_encoder *intel_encoder, int ddc_bus);
+extern bool intel_ddc_probe(struct intel_encoder *intel_encoder,
+ struct i2c_adapter *adapter);

extern void intel_attach_force_audio_property(struct drm_connector *connector);
extern void intel_attach_broadcast_rgb_property(struct drm_connector *connector);
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 6eda1b5..6ff1095 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -244,7 +244,7 @@ static int intel_dvo_get_modes(struct drm_connector *connector)
* that's not the case.
*/
intel_ddc_get_modes(connector,
- &dev_priv->gmbus[GMBUS_PORT_DPC].adapter);
+ intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
if (!list_empty(&connector->probed_modes))
return 1;

@@ -387,7 +387,7 @@ void intel_dvo_init(struct drm_device *dev)
* It appears that everything is on GPIOE except for panels
* on i830 laptops, which are on GPIOB (DVOA).
*/
- i2c = &dev_priv->gmbus[gpio].adapter;
+ i2c = intel_gmbus_get_adapter(dev_priv, gpio);

intel_dvo->dev = *dvo;
if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 64541f7..a5844d7 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -40,7 +40,7 @@
struct intel_hdmi {
struct intel_encoder base;
u32 sdvox_reg;
- int ddc_bus;
+ struct i2c_adapter *ddc_bus;
uint32_t color_range;
bool has_hdmi_sink;
bool has_audio;
@@ -327,14 +327,12 @@ static enum drm_connector_status
intel_hdmi_detect(struct drm_connector *connector, bool force)
{
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
- struct drm_i915_private *dev_priv = connector->dev->dev_private;
struct edid *edid;
enum drm_connector_status status = connector_status_disconnected;

intel_hdmi->has_hdmi_sink = false;
intel_hdmi->has_audio = false;
- edid = drm_get_edid(connector,
- &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
+ edid = drm_get_edid(connector, intel_hdmi->ddc_bus);

if (edid) {
if (edid->input & DRM_EDID_INPUT_DIGITAL) {
@@ -357,26 +355,22 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
static int intel_hdmi_get_modes(struct drm_connector *connector)
{
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
- struct drm_i915_private *dev_priv = connector->dev->dev_private;

/* We should parse the EDID data and find out if it's an HDMI sink so
* we can send audio to it.
*/

- return intel_ddc_get_modes(connector,
- &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
+ return intel_ddc_get_modes(connector, intel_hdmi->ddc_bus);
}

static bool
intel_hdmi_detect_audio(struct drm_connector *connector)
{
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
- struct drm_i915_private *dev_priv = connector->dev->dev_private;
struct edid *edid;
bool has_audio = false;

- edid = drm_get_edid(connector,
- &dev_priv->gmbus[intel_hdmi->ddc_bus].adapter);
+ edid = drm_get_edid(connector, intel_hdmi->ddc_bus);
if (edid) {
if (edid->input & DRM_EDID_INPUT_DIGITAL)
has_audio = drm_detect_monitor_audio(edid);
@@ -521,23 +515,28 @@ void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)
/* Set up the DDC bus. */
if (sdvox_reg == SDVOB) {
intel_encoder->clone_mask = (1 << INTEL_HDMIB_CLONE_BIT);
- intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
+ intel_hdmi->ddc_bus = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_DPB);
dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
} else if (sdvox_reg == SDVOC) {
intel_encoder->clone_mask = (1 << INTEL_HDMIC_CLONE_BIT);
- intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
+ intel_hdmi->ddc_bus = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_DPC);
dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
} else if (sdvox_reg == HDMIB) {
intel_encoder->clone_mask = (1 << INTEL_HDMID_CLONE_BIT);
- intel_hdmi->ddc_bus = GMBUS_PORT_DPB;
+ intel_hdmi->ddc_bus = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_DPB);
dev_priv->hotplug_supported_mask |= HDMIB_HOTPLUG_INT_STATUS;
} else if (sdvox_reg == HDMIC) {
intel_encoder->clone_mask = (1 << INTEL_HDMIE_CLONE_BIT);
- intel_hdmi->ddc_bus = GMBUS_PORT_DPC;
+ intel_hdmi->ddc_bus = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_DPC);
dev_priv->hotplug_supported_mask |= HDMIC_HOTPLUG_INT_STATUS;
} else if (sdvox_reg == HDMID) {
intel_encoder->clone_mask = (1 << INTEL_HDMIF_CLONE_BIT);
- intel_hdmi->ddc_bus = GMBUS_PORT_DPD;
+ intel_hdmi->ddc_bus = intel_gmbus_get_adapter(dev_priv,
+ GMBUS_PORT_DPD);
dev_priv->hotplug_supported_mask |= HDMID_HOTPLUG_INT_STATUS;
}

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 1135e3e..87a3abf 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -426,6 +426,13 @@ err:
return ret;
}

+struct i2c_adapter *intel_gmbus_get_adapter(struct drm_i915_private *dev_priv,
+ unsigned pin)
+{
+ BUG_ON(pin >= GMBUS_NUM_PORTS);
+ return &dev_priv->gmbus[pin].adapter;
+}
+
void intel_gmbus_set_speed(struct i2c_adapter *adapter, int speed)
{
struct intel_gmbus *bus = to_intel_gmbus(adapter);
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index aa84832..24c73d7 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -948,7 +948,8 @@ bool intel_lvds_init(struct drm_device *dev)
* preferred mode is the right one.
*/
intel_lvds->edid = drm_get_edid(connector,
- &dev_priv->gmbus[pin].adapter);
+ intel_gmbus_get_adapter(dev_priv,
+ pin));
if (intel_lvds->edid) {
if (drm_add_edid_modes(connector,
intel_lvds->edid)) {
diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index be2c6fe..095c1ae 100644
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -35,9 +35,9 @@
* intel_ddc_probe
*
*/
-bool intel_ddc_probe(struct intel_encoder *intel_encoder, int ddc_bus)
+bool intel_ddc_probe(struct intel_encoder *intel_encoder,
+ struct i2c_adapter *ddc_bus)
{
- struct drm_i915_private *dev_priv = intel_encoder->base.dev->dev_private;
u8 out_buf[] = { 0x0, 0x0};
u8 buf[2];
struct i2c_msg msgs[] = {
@@ -55,7 +55,7 @@ bool intel_ddc_probe(struct intel_encoder *intel_encoder, int ddc_bus)
}
};

- return i2c_transfer(&dev_priv->gmbus[ddc_bus].adapter, msgs, 2) == 2;
+ return i2c_transfer(ddc_bus, msgs, 2) == 2;
}

/**
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index e334ec3..dc1c8df 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1251,9 +1251,7 @@ static struct edid *
intel_sdvo_get_analog_edid(struct drm_connector *connector)
{
struct drm_i915_private *dev_priv = connector->dev->dev_private;
-
- return drm_get_edid(connector,
- &dev_priv->gmbus[dev_priv->crt_ddc_pin].adapter);
+ return drm_get_edid(connector, dev_priv->crt_ddc);
}

enum drm_connector_status
@@ -1921,12 +1919,12 @@ intel_sdvo_select_i2c_bus(struct drm_i915_private *dev_priv,
if (mapping->initialized)
pin = mapping->i2c_pin;

- if (pin < GMBUS_NUM_PORTS) {
- sdvo->i2c = &dev_priv->gmbus[pin].adapter;
+ if (pin <= GMBUS_PORT_DPD) {
+ sdvo->i2c = intel_gmbus_get_adapter(dev_priv, pin);
intel_gmbus_set_speed(sdvo->i2c, GMBUS_RATE_1MHZ);
intel_gmbus_force_bit(sdvo->i2c, true);
} else {
- sdvo->i2c = &dev_priv->gmbus[GMBUS_PORT_DPB].adapter;
+ sdvo->i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB);
}
}

--
1.7.7.3

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