add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/drivers/gpu/drm/rockchip/ebc-dev/bufmanage/buf_manage.c
..
..
@@ -76,6 +76,29 @@
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 	}
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 }
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+int ebc_drop_one_dsp_buf(void)
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+{
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+	struct ebc_buf_s *temp_buf;
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+	int temp_pos;
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+
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+	mutex_lock(&ebc_buf_info.dsp_buf_lock);
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+	if (ebc_buf_info.dsp_buf_list) {
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+		if (ebc_buf_info.dsp_buf_list->nb_elt > 0) {
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+			temp_pos = ebc_buf_info.dsp_buf_list->nb_elt - 1;
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+			temp_buf = (struct ebc_buf_s *)buf_list_get(ebc_buf_info.dsp_buf_list, temp_pos);
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+			if (temp_buf->needpic == 2) {
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+				buf_list_remove(ebc_buf_info.dsp_buf_list, temp_pos);
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+				ebc_buf_release(temp_buf);
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+				mutex_unlock(&ebc_buf_info.dsp_buf_lock);
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+				return BUF_SUCCESS;
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+			}
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+		}
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+	}
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+	mutex_unlock(&ebc_buf_info.dsp_buf_lock);
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+
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+	return BUF_ERROR;
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+}
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+
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 int ebc_add_to_dsp_buf_list(struct ebc_buf_s *dsp_buf)
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 {
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 	mutex_lock(&ebc_buf_info.dsp_buf_lock);