[Intel-gfx] [PATCH v2 7/8] drm/i915/lspcon: Get DDC adapter via container_of() instead of cached ptr

[Imre Deak]

We can use the container_of() magic to get to the DDC adapter, so no
need for caching a pointer to it. We'll also need to get at the intel_dp
ptr in the following patch, so add a helper that can be used for both
purposes.

Cc: Shashank Sharma <shashank.sha...@intel.com>
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h    |  1 -
 drivers/gpu/drm/i915/intel_lspcon.c | 15 +++++++++++----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a79cbad..45f55b5 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -974,7 +974,6 @@ struct intel_dp {
 struct intel_lspcon {
        bool active;
        enum drm_lspcon_mode mode;
-       struct drm_dp_aux *aux;
 };
 
 struct intel_digital_port {
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c 
b/drivers/gpu/drm/i915/intel_lspcon.c
index c5f278b..3dc5a0b 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -27,10 +27,18 @@
 #include <drm/drm_dp_dual_mode_helper.h>
 #include "intel_drv.h"
 
+static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
+{
+       struct intel_digital_port *dig_port =
+               container_of(lspcon, struct intel_digital_port, lspcon);
+
+       return &dig_port->dp;
+}
+
 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon 
*lspcon)
 {
        enum drm_lspcon_mode current_mode = DRM_LSPCON_MODE_INVALID;
-       struct i2c_adapter *adapter = &lspcon->aux->ddc;
+       struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 
        if (drm_lspcon_get_mode(adapter, &current_mode))
                DRM_ERROR("Error reading LSPCON mode\n");
@@ -45,7 +53,7 @@ static int lspcon_change_mode(struct intel_lspcon *lspcon,
 {
        int err;
        enum drm_lspcon_mode current_mode;
-       struct i2c_adapter *adapter = &lspcon->aux->ddc;
+       struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 
        err = drm_lspcon_get_mode(adapter, &current_mode);
        if (err) {
@@ -72,7 +80,7 @@ static int lspcon_change_mode(struct intel_lspcon *lspcon,
 static bool lspcon_probe(struct intel_lspcon *lspcon)
 {
        enum drm_dp_dual_mode_type adaptor_type;
-       struct i2c_adapter *adapter = &lspcon->aux->ddc;
+       struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
 
        /* Lets probe the adaptor and check its type */
        adaptor_type = drm_dp_dual_mode_detect(adapter);
@@ -111,7 +119,6 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
 
        lspcon->active = false;
        lspcon->mode = DRM_LSPCON_MODE_INVALID;
-       lspcon->aux = &dp->aux;
 
        if (!lspcon_probe(lspcon)) {
                DRM_ERROR("Failed to probe lspcon\n");
-- 
2.5.0

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