mm: tlb: mtl: Fix memory page unmapping

The sys_mm_drv_unmap_page function first replaced the tlb entry with
the default one and then read the physical address that was mapped.
However, it was already overwritten, so it always release the default
physical address instead of the truly mapped one.

Signed-off-by: Adrian Warecki <[email protected]>

drivers/mm/mm_drv_intel_adsp_mtl_tlb.c

@@ -333,7 +333,6 @@ int sys_mm_drv_unmap_page(void *virt)
 {
 	k_spinlock_key_t key;
 	uint32_t entry_idx, bank_idx;
-	uint16_t entry;
 	uint16_t *tlb_entries = UINT_TO_POINTER(TLB_BASE);
 	uintptr_t pa;
 	int ret = 0;
@@ -363,16 +362,14 @@ int sys_mm_drv_unmap_page(void *virt)
 	sys_cache_data_flush_range(virt, CONFIG_MM_DRV_PAGE_SIZE);
 
 	entry_idx = get_tlb_entry_idx(va);
-	/* Restore default entry settings */
-	entry = pa_to_tlb_entry(va) | TLB_EXEC_BIT | TLB_WRITE_BIT;
-	/* Clear the enable bit */
-	entry &= ~TLB_ENABLE_BIT;
-	tlb_entries[entry_idx] = entry;
-
 	pa = tlb_entry_to_pa(tlb_entries[entry_idx]);
 
-	/* Check bounds of physical address space. */
-	/* Initial TLB mappings could point to non existing physical pages. */
+	/* Restore default entry settings with cleared the enable bit. */
+	tlb_entries[entry_idx] = 0;
+
+	/* Check bounds of physical address space.
+	 * Initial TLB mappings could point to non existing physical pages.
+	 */
 	if ((pa >= L2_SRAM_BASE) && (pa < (L2_SRAM_BASE + L2_SRAM_SIZE))) {
 		sys_mem_blocks_free_contiguous(&L2_PHYS_SRAM_REGION,
 					       UINT_TO_POINTER(pa), 1);