drm/omap: dss: Merge two disconnection helpers

To simplify the pipeline disconnection handling merge the
omapdss_device_disconnect() and omapdss_output_unset_device() functions.
The device state check is now called for every device in the pipeline,
extending this sanity check coverage.

There is no need to return an error from omapdss_device_disconnect()
when the check fails, as omapdss_output_unset_device() used to do, given
that we can't prevent disconnection due to device unbinding (the return
value of omapdss_output_unset_device() is never checked in the current
code for that reason).

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

9 files changed, 2 insertions, 28 deletions

diff --git a/drivers/gpu/drm/omapdrm/dss/base.c b/drivers/gpu/drm/omapdrm/dss/base.c
index 02c6ed97d632..89472715ee8f 100644
--- a/drivers/gpu/drm/omapdrm/dss/base.c
+++ b/drivers/gpu/drm/omapdrm/dss/base.c
@@ -235,6 +235,8 @@ void omapdss_device_disconnect(struct omap_dss_device *src,
                 src->dst = NULL;
         }
 
+        WARN_ON(dst->state != OMAP_DSS_DISPLAY_DISABLED);
+
         if (dst->driver)
                 dst->driver->disconnect(src, dst);
         else
diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index eeeea936f889..178b463c2d60 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -633,7 +633,6 @@ static void dpi_disconnect(struct omap_dss_device *src,
                            struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }
diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 9c617e35efd1..948e3b873523 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -4903,7 +4903,6 @@ static void dsi_disconnect(struct omap_dss_device *src,
                            struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index 22f8b74f5bf5..6616530d5fe6 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -450,7 +450,6 @@ static void hdmi_disconnect(struct omap_dss_device *src,
                             struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index d8592d02a58d..f7e15edc05fc 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -455,7 +455,6 @@ static void hdmi_disconnect(struct omap_dss_device *src,
                             struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index 600ac7c25724..8f9538e17ea4 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -522,7 +522,6 @@ int omap_dss_get_num_overlays(void);
 #define for_each_dss_output(d) \
         while ((d = omapdss_device_get_next(d, OMAP_DSS_DEVICE_TYPE_OUTPUT)) != NULL)
 int omapdss_output_validate(struct omap_dss_device *out);
-int omapdss_output_unset_device(struct omap_dss_device *out);
 
 typedef void (*omap_dispc_isr_t) (void *arg, u32 mask);
 int omap_dispc_register_isr(omap_dispc_isr_t isr, void *arg, u32 mask);
diff --git a/drivers/gpu/drm/omapdrm/dss/output.c b/drivers/gpu/drm/omapdrm/dss/output.c
index be544dd48bf4..2da480be918d 100644
--- a/drivers/gpu/drm/omapdrm/dss/output.c
+++ b/drivers/gpu/drm/omapdrm/dss/output.c
@@ -24,8 +24,6 @@
 #include "dss.h"
 #include "omapdss.h"
 
-static DEFINE_MUTEX(output_lock);
-
 int omapdss_output_validate(struct omap_dss_device *out)
 {
         if (out->next && out->output_type != out->next->type) {
@@ -37,25 +35,6 @@ int omapdss_output_validate(struct omap_dss_device *out)
 }
 EXPORT_SYMBOL(omapdss_output_validate);
 
-int omapdss_output_unset_device(struct omap_dss_device *out)
-{
-        int r = 0;
-
-        mutex_lock(&output_lock);
-
-        if (out->dst->state != OMAP_DSS_DISPLAY_DISABLED) {
-                dev_err(out->dev,
-                        "device %s is not disabled, cannot unset device\n",
-                        out->dst->name);
-                r = -EINVAL;
-        }
-
-        mutex_unlock(&output_lock);
-
-        return r;
-}
-EXPORT_SYMBOL(omapdss_output_unset_device);
-
 int dss_install_mgr_ops(struct dss_device *dss,
                         const struct dss_mgr_ops *mgr_ops,
                         struct omap_drm_private *priv)
diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
index 2101a697a08a..764299cafbe2 100644
--- a/drivers/gpu/drm/omapdrm/dss/sdi.c
+++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
@@ -274,7 +274,6 @@ static void sdi_disconnect(struct omap_dss_device *src,
                            struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }
diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index e673f3e78c69..c2811c425195 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -713,7 +713,6 @@ static void venc_disconnect(struct omap_dss_device *src,
                             struct omap_dss_device *dst)
 {
         omapdss_device_disconnect(dst, dst->next);
-        omapdss_output_unset_device(dst);
 
         dss_mgr_disconnect(dst);
 }