msm: camera: smmu: Moves custom smmu API's to cam_compat

Moves custom smmu API's to cam_compat as some of them are legacy and
will not be supported in newer kernel versions.

CRs-Fixed: 3048249
Change-Id: Ic9db5d9d295eb02e8bd2d593721b65e30d605f72
Signed-off-by: Karthik Jayakumar <[email protected]>

drivers/cam_smmu/cam_smmu_api.c

@@ -3863,11 +3863,9 @@ static int cam_smmu_setup_cb(struct cam_context_bank_info *cb,
 			goto end;
 		}
 
-		iommu_dma_enable_best_fit_algo(dev);
-
-		if (cb->discard_iova_start)
-			iommu_dma_reserve_iova(dev, cb->discard_iova_start,
-				cb->discard_iova_len);
+		/* Enable custom iommu features, if applicable */
+		cam_smmu_util_iommu_custom(dev, cb->discard_iova_start,
+			cb->discard_iova_len);
 
 		cb->state = CAM_SMMU_ATTACH;
 	} else {

drivers/cam_utils/cam_compat.c

@@ -294,6 +294,12 @@ static int inline cam_subdev_list_cmp(struct cam_subdev *entry_1, struct cam_sub
 }
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+void cam_smmu_util_iommu_custom(struct device *dev,
+	dma_addr_t discard_start, size_t discard_length)
+{
+	return;
+}
+
 int cam_req_mgr_ordered_list_cmp(void *priv,
 	const struct list_head *head_1, const struct list_head *head_2)
 {
@@ -323,6 +329,17 @@ int cam_get_ddr_type(void)
 	return DDR_TYPE_LPDDR5;
 }
 #else
+void cam_smmu_util_iommu_custom(struct device *dev,
+	dma_addr_t discard_start, size_t discard_length)
+{
+	iommu_dma_enable_best_fit_algo(dev);
+
+	if (discard_start)
+		iommu_dma_reserve_iova(dev, discard_start, discard_length);
+
+	return;
+}
+
 int cam_req_mgr_ordered_list_cmp(void *priv,
 	struct list_head *head_1, struct list_head *head_2)
 {

drivers/cam_utils/cam_compat.h

@@ -12,6 +12,7 @@
 #include <linux/iommu.h>
 #include <linux/qcom_scm.h>
 #include <linux/list_sort.h>
+#include <linux/dma-iommu.h>
 
 #include "cam_csiphy_dev.h"
 #include "cam_cpastop_hw.h"
@@ -48,6 +49,8 @@ void cam_check_iommu_faults(struct iommu_domain *domain,
 	struct cam_smmu_pf_info *pf_info);
 int cam_get_ddr_type(void);
 int cam_compat_util_get_dmabuf_va(struct dma_buf *dmabuf, uintptr_t *vaddr);
+void cam_smmu_util_iommu_custom(struct device *dev,
+	dma_addr_t discard_start, size_t discard_length);
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
 int cam_req_mgr_ordered_list_cmp(void *priv,