[PATCH 18/24] v4l: vsp1: lut: Support runtime modification of controls

[Laurent Pinchart]

Allow reconfiguration of the look-up table at runtime.

Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
---
 drivers/media/platform/vsp1/vsp1_lut.c | 25 +++++++++++++++----------
 drivers/media/platform/vsp1/vsp1_lut.h |  3 +++
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/vsp1/vsp1_lut.c 
b/drivers/media/platform/vsp1/vsp1_lut.c
index 0bd26dd5f706..e34237824a5a 100644
--- a/drivers/media/platform/vsp1/vsp1_lut.c
+++ b/drivers/media/platform/vsp1/vsp1_lut.c
@@ -52,7 +52,9 @@ static int lut_set_table(struct vsp1_lut *lut, struct 
v4l2_ctrl *ctrl)
                vsp1_dl_fragment_write(dlb, VI6_LUT_TABLE + 4 * i,
                                       ctrl->p_new.p_u32[i]);
 
+       spin_lock_irq(&lut->lock);
        swap(lut->lut, dlb);
+       spin_unlock_irq(&lut->lock);
 
        vsp1_dl_fragment_free(dlb);
        return 0;
@@ -184,20 +186,21 @@ static void lut_configure(struct vsp1_entity *entity,
                          struct vsp1_dl_list *dl, bool full)
 {
        struct vsp1_lut *lut = to_lut(&entity->subdev);
+       struct vsp1_dl_body *dlb;
+       unsigned long flags;
 
-       if (!full)
+       if (full) {
+               vsp1_lut_write(lut, dl, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
                return;
-
-       vsp1_lut_write(lut, dl, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
-
-       mutex_lock(lut->ctrls.lock);
-
-       if (lut->lut) {
-               vsp1_dl_list_add_fragment(dl, lut->lut);
-               lut->lut = NULL;
        }
 
-       mutex_unlock(lut->ctrls.lock);
+       spin_lock_irqsave(&lut->lock, flags);
+       dlb = lut->lut;
+       lut->lut = NULL;
+       spin_unlock_irqrestore(&lut->lock, flags);
+
+       if (dlb)
+               vsp1_dl_list_add_fragment(dl, dlb);
 }
 
 static const struct vsp1_entity_operations lut_entity_ops = {
@@ -217,6 +220,8 @@ struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
        if (lut == NULL)
                return ERR_PTR(-ENOMEM);
 
+       spin_lock_init(&lut->lock);
+
        lut->entity.ops = &lut_entity_ops;
        lut->entity.type = VSP1_ENTITY_LUT;
 
diff --git a/drivers/media/platform/vsp1/vsp1_lut.h 
b/drivers/media/platform/vsp1/vsp1_lut.h
index 021898fc0ce5..f8c4e8f0a79d 100644
--- a/drivers/media/platform/vsp1/vsp1_lut.h
+++ b/drivers/media/platform/vsp1/vsp1_lut.h
@@ -13,6 +13,8 @@
 #ifndef __VSP1_LUT_H__
 #define __VSP1_LUT_H__
 
+#include <linux/spinlock.h>
+
 #include <media/media-entity.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-subdev.h>
@@ -29,6 +31,7 @@ struct vsp1_lut {
 
        struct v4l2_ctrl_handler ctrls;
 
+       spinlock_t lock;
        struct vsp1_dl_body *lut;
 };
 
-- 
Regards,

Laurent Pinchart

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