+static void
+radv_update_zrange_precision(struct radv_cmd_buffer *cmd_buffer,
+ struct radv_ds_buffer_info *ds,
+ struct radv_image *image, VkImageLayout layout,
+ bool requires_cond_write)
+{
+ uint32_t db_z_info = ds->db_z_info;
+ uint32_t db_z_info_reg;
+
+ if (!radv_image_is_tc_compat_htile(image))
+ return;
+
+ if (!radv_layout_has_htile(image, layout,
+ radv_image_queue_family_mask(image,
+ cmd_buffer->queue_family_index,
+ cmd_buffer->queue_family_index))) {
+ db_z_info &= C_028040_TILE_SURFACE_ENABLE;
+ }
+
+ db_z_info &= C_028040_ZRANGE_PRECISION;
+
+ if (cmd_buffer->device->physical_device->rad_info.chip_class >= GFX9) {
+ db_z_info_reg = R_028038_DB_Z_INFO;
+ } else {
+ db_z_info_reg = R_028040_DB_Z_INFO;
+ }
+
+ /* When we don't know the last fast clear value we need to emit a
+ * conditional packet, otherwise we can update DB_Z_INFO directly.
+ */
+ if (requires_cond_write) {
+ radeon_emit(cmd_buffer->cs, PKT3(PKT3_COND_WRITE, 7, 0));
+
+ const uint32_t write_space = 0 << 8; /* register */
+ const uint32_t poll_space = 1 << 4; /* memory */
+ const uint32_t function = 3 << 0; /* equal to the reference */
+ const uint32_t options = write_space | poll_space | function;
+ radeon_emit(cmd_buffer->cs, options);
+
+ /* poll address - location of the depth clear value */
+ uint64_t va = radv_buffer_get_va(image->bo);
+ va += image->offset + image->clear_value_offset;
+
+ /* In presence of stencil format, we have to adjust the base
+ * address because the first value is the stencil clear value.
+ */
+ if (vk_format_is_stencil(image->vk_format))
+ va += 4;
+
+ radeon_emit(cmd_buffer->cs, va);
+ radeon_emit(cmd_buffer->cs, va >> 32);
+
+ radeon_emit(cmd_buffer->cs, fui(0.0f)); /* reference value */
+ radeon_emit(cmd_buffer->cs, (uint32_t)-1); /* comparison mask */
+ radeon_emit(cmd_buffer->cs, db_z_info_reg >> 2); /* write address low */
+ radeon_emit(cmd_buffer->cs, 0u); /* write address high */
+ radeon_emit(cmd_buffer->cs, db_z_info);
+ } else {
+ radeon_set_context_reg(cmd_buffer->cs, db_z_info_reg, db_z_info);
+ }
+}
+